At the New School: Against Money

This is the edited transcript of a talk I delivered on March 5 at the Heilbroner Center for the Study of Capitalism at the New School for Social Research in New York, at the invitation of Julia Ott. The talk is an attempt to explain what Against Money (my forthcoming book with Arjun Jayadev) is about, and why it matters. Earlier attempts can be found here and here. You can listen to the full recording of this talk, including some quite interesting questions from the audience, here:

 

Since we are at the Heilbroner Center, I thought I would begin with Robert Heilbroner. 

Heilbroner is best known for his book, The Worldly Philosophers, a popular history of economic thought. There’s an interesting discussion in the introduction to later editions of the book about his struggle to come up with a title for it. 

He did not want a title that included the word economist — he understood that a book about economists would have, at best, limited appeal. His initial thought was to call it “The Money Philosophers.” But after considering that, he decided that it didn’t really fit his subjects, because, money, for the most part, was not a major concern for them.

I think he was right to have those misgivings, and to instead choose the title he did. Because money, perhaps surprisingly, plays a rather small part in the history of economic thought. 

The dominant view on money among economists, which you can find in almost unchanged from the 18th century down to any contemporary textbook, is that money is neutral. There is a real economy, a concrete existing world of labor, of technology, of human needs and of resources that can meet them, which all exists prior to and independently of money. It’s in this real world that relative values are established, and where the possibilities for production exist prior to any sort of measurement in terms of money. Things would be exchanged in the same proportions in the absence of money, or with any other difference form or quantity of money. Money is at best a numeraire,  a mild convenience to help us describe relative values and simplify exchange that would happen on essentially the same terms without it. 

Going back to 1752, we find David Hume writing:

Money is nothing but the representation of labour and commodities, and serves only as a method of rating or estimating them. Where coin is in greater plenty; as a greater quantity of it is required to represent the same quantity of goods; it can have no effect, either good or bad…

What we have here is the idea, first, that there is a quantity of goods already existing in the world before we measure it or rate it with money, and second, that the use of money to coordinate the exchange of goods, to measure the quantity of goods, has no effect on that quantity, either good or bad. 

Now Hume himself went on to complicate this argument in interesting ways. But for many economists down to the present, this is where the story stops.

Variations on this are the central throughline in economic thought around money. Coming down to our century, we find Lawrence Meyer, who was recently a member of the Fed’s Federal Open Market Committee, saying,

Monetary policy cannot influence real variables, such as output and employment. This is often referred to as the principle of neutrality of money. Money growth is solely the determinant of inflation in the long run. Price stability, in some form, is the direct, unequivocal, and singular long-term objective of monetary policy.

Again we see the same notion that control over money or credit cannot affect real outcomes, such as output or employment. At most, it can affect the measurement of those outcomes in terms of prices, that is, inflation.

I could multiply many similar quotes from the centuries in between these two. The great exception  is, of course, Keynes.

If you got an economics education in the Keynesian tradition, as Arjun Jayadev and I did at the University of Massachusetts, then you probably spent a great deal of time thinking about money. You might even have imagined yourself as a money philosopher, or on the path to being one, or at least you were interested in what the money philosophers had to say. And you will have seen, more or less clearly, that there’s an important connection between the organization of money, the form of money, and real outcomes in the economy. 

As Keynes himself put it in a 1932 article, which was arguably the opening salvo of the Keynesian revolution, the theory he was looking for was

a theory of an economy in which money plays a part of its own and affects motives and decisions and is one of the operative factors in the situation so that the course of events cannot be predicted, either in the long period or in the short, without a knowledge of the behavior of money. 

The Keynesian vision is one where the operation of money is central in driving real outcomes, that money plays an active organizing role in the economy, and that one can’t understand real outcomes without an understanding of money. 

Of course, Keynes was not by any means the first person to think this way, to think that the world of money and the concrete organization of production cannot be separated. There’s a kind of samizdat tradition, “the army of cranks and brave heretics” that Keynes acknowledges as his predecessors, who have made similar arguments. 

One very interesting early figure in this tradition is John Law. John Law is remembered today as a sort of con artist, or as an early example of the dangers of trying to manipulate real outcomes by the use of money, because of his proposals adopted by the French government to set up a bank that would issue paper currency backed by land in the New World and other proposals for financial reform, and for what we might even today call industrial policy. 

These proposals were not successful. Their failure contributed to the problems of the French monarchy in the 18th century. But the interesting thing about him is that he was not just a monetary reformer, that he was a genuine theorist. Joseph Schumpeter even puts him in “the front rank of monetary theorists of all time.”

Law’s proposals were motivated by a vision of money, as he put it, as not being merely “the value that is exchanged” but “the value in exchange” — the activity that happens through the use of money creates new value that does not exist prior to it. Coming from a background in Scotland, he writes about a situation where there is both vacant land and idle labor. They can’t be put together, they can’t be used productively, in the absence of money — to provide coordination, as we would say today.

The existence of coordination problems, creates the possibility that money is not just a yardstick for exchanges that would have happened regardless, but opens up new possibilities for cooperation — that there can be new value created by money that did not exist in the world prior to it. This is the opposite of the argument made by Hume and others and in principle opens up the possibility of creating real wealth, of transforming the real world through the manipulation of money. 

We can trace a line forward from Law to Alexander Hamilton, a more successful advocate for financial reform in the context of a program of national development. Hamilton is not usually thought of as an economic theorist, but his writing in the “Report on Manufactures” and other proposals for developing American industry drew importantly on a vision of a more elastic and flexible monetary system.

Interestingly, one suggestion that Hamilton made for increasing the supply of “monied Capital” was for the federal government to permanently maintain a large debt. Anticipating contemporary heterodox economists, he argued that rather than crowding out private investment, federal borrowing would in effect crowd it in, because government debt was a close substitute for money — a source rather than a use of liquidity, as we might say.

We can follow this line on to Henry Thornton and the anti-bullionists in the early 19th century, who saw a flexible system of bank money as better suited than a rigid gold standard for promoting real economic activity. And then on to Thomas Tooke, who Karl Marx considered “the last English economist of any value,” and to  Walter Bagehot and American monetary economists like Allyn Young, and then on to Schumpeter and of course Keynes himself and his successors. 

What do these heterodox thinkers on money have in common? 

From our point of view, first, they all see money not as a distinct object existing in a definite quantity, but as one end of a continuum of financial instruments or arrangements. They see money as a subset of credit. Schumpeter says that when thinking about money we “should not start from the coin,” we should not start from the discrete object that we call money. Rather we should, as all of these thinkers did to one degree or another, imagine a whole system of credit arrangements, some of which can be classified for various purposes as money. He distinguishes a “money theory of credit,” which most economists hold, from a “credit theory of money,” which is what he prefers. The starting point, the atomic unit, is the promise, not the exchange.

Second, and this is a central theme of our book, these thinkers all saw the interest rate as the price of money, rather than the price of savings. An important part of John Law’s argument for his financial reforms was that it would allow a lower rate of interest by making money more abundant. Walter Bagehot insisted that interest was the price of money, not of saving as orthodoxy has it.

The liquidity theory of interest is arguably the analytic keystone of Keynes’ General Theory. This question of whether the interest rate represents a real constraint, a trade-off between stuff today and stuff tomorrow, the price of savings or loanable funds, versus whether it is a fundamentally financial price set in financial markets as the price of money or liquidity, is a  through line in debates over money. 

More broadly, there is the idea of money as a facilitator or enabler of economic activity, as a vehicle for transformation of the real world, versus the idea of money as a passive measuring rod or numeraire. Connected with this is the idea that money requires some form of active management. The orthodox view of money, along with seeing it as fundamentally or at least ideally neutral, has always looked for some kind of automatic rule to regulate credit and money. 

Going back to Hume again at the beginning of this tradition, he at some points argued that banks should not exist. He wrote that the best bank would be one that took coins and kept them locked up until their owner came back for them, without creating credit in any form.

That is the extreme version of this position, but in less extreme forms there’s a constant attraction to the idea that bank credit should reproduce some natural logic of exchange, and not have any independent effect on economic activity. We can see it in the 19th century in the form of the real bills doctrine and of the gold standard — two different approaches to creating an automatic mechanism for regulating the creation of money and credit. Later in the century there were ideas of strictly capping the amount of paper money that could be produced, or separating the lending and payments functions of banks — an idea that constantly recurs in right-wing ideas for monetary reform. Behind this there was often the idea of an “ideal circulation,” where whatever the concrete form that money took, it should mimic the behavior of a pure metallic currency. 

Then in the 20th century we get Milton Friedman’s idea that central banks should follow a strict money supply growth rule — an updated version of the cap on banknote issuance imposed on the Bank of England in the 1840s. And more recently we have the Taylor rule and similar rules that are supposed to guide the behavior of central banks. Some right-wing legislators have even proposed writing the Taylor rule into law, so the Federal Reserve would no longer have any choice about monetary policy. 

What all these rules have in common is the idea that there is some kind of autopilot that you can put the management of money and credit on, so that it no longer involves any active choices, public or private — so that money will manage itself. 

This goes with the idea that even if money is not always neutral in practice, that it ought to be neutral. It goes with the the idea that there is some set of natural outcomes dictated by the real material choices facing us, by the problem of scarce means and alternative ends that Lionel Robbins defined as the problem of economics, that there is an objective best solution to the trade-offs facing us as a society —  and if money is telling us to do something else or allowing us to do something else, that is a problem. We need to make money automatic so that we can return to this genuine non-monetary set of trade-offs that we are trying to solve. 

In other words, when we think of money as neutral, that implies a specific kind of views about social reality in general. If we think of money as a transparent window onto a pre-existing world of goods, a pre-existing set of relative values, a pre-existing set of opportunities and resources facing us,  then we are going to see the world itself as fundamentally money-like. We are going to see the existence of prices, the division of social reality into discrete commodities with ownership rights attached to them, as a basic fact about the world, which money is simply revealing to us. 

When we see money as a distinct institution, as a distinct social technology of coordination, then we can see the rest of the world as being different from that. We can see all the ways in which the process of production, all the ways we organize our society are different from what happens in markets and different from what is mediated by money. We can see the world not as a set of existing commodities that need to be allocated to their best use to satisfy human needs but as an open-ended collective project of transforming the material world. 

This second view is what Keynes called the monetary production paradigm. 

In the 1932 article that I earlier suggested could mark the beginning of the Keynesian revolution, Keynes distinguished a real exchange view of the economy from a monetary production view. The real exchange view he associated with the traditional view of money as neutral — it’s a vision of a world in which fundamentally the economic problem is barter. So for instance Paul Samuelson’s famous textbook, the most influential economics textbook of the 20th century, says that we can reduce essentially all economic problems to problems of barter. 

In this world, the economic process is fundamentally about exchanging real things. Production is just a special case of exchange. You put in your  capital, I put in my labor, we get a definite amount of output out that we divide in proportion to what we put in, on terms that we all knew and agreed on in advance.

The real exchange view of production was perfectly expressed by Keynes’ Swedish contemporary Knut Wicksell, the originator of  the modern approach to monetary policy. He described economic growth as being like wine aging in barrels. We’d like to drink the wine today, because that would be nice; but on the other hand if we leave it to age in the barrel for longer it will improve in quality. The wine is already there, we know how much there is and how much better it will be next year. All the possibilities are defined in advance. We just have to decide what pace of drinking it will bring us the most pleasure. 

A monetary production view of the world, on the other hand, is one in which the economic process is a one of collectively transforming the world. This is an active process that structured and mediated by money, and organized around the accumulation of money.  In this view of the world, production is a cooperative human activity whose possibilities are not knowable in advance. 

In this monetary-production paradigm, the fundamental constraint is not scarcity; the economic problem is not allocation. The fundamental constraint is coordination. When we stop imagining the world in terms of discrete commodities being combined in different ways, and start imagining it in terms of human beings cooperating (or not) to do things together,  the problem becomes: How do we coordinate the activity of all these different people? What does it take to allow cooperation on a larger scale, between people who don’t have pre-existing relationships? 

That is the problem that economic life is seeking to solve. And in particular, we argue, it is the problem that money helps solve. By its nature, this is not a problem that we can know where the opportunities are in advance. This uncertainty about the possibilities of the future is a fundamental component of Keynes’ vision, and is linked to the centrality that money has in his vision. 

So far all of this has been pretty abstract. Let’s turn now to some of the implications of these questions for the real world. Because, after all, these debates are only interesting insofar as they help us become masters of the happenings of real life. They’re interesting insofar as they give us some ability to intervene in the world around us. The reason that Arjun and I wrote this book is that we came to feel that many of the concrete problems that we were interested in, and that other people are interested in, require a different view of money to make sense of them. 

Let me give an example. The two of us wrote a number of papers some years ago, which were in some ways the starting point of this book, about the rise in household debt between 1980 and 2007. Between 1980 and 2007, household debt in the United States rose from roughly 50 percent of GDP to 100 percent of GDP. This was something you were very aware of if you were beginning your life as an economist in the 2000s, and it became even more interesting in the wake of the financial crisis of 2007–2009, which the rise in household debt seemed like one of the underlying causes of. 

In general, when people talk about rising household debt they attribute it to rising household borrowing. Much of the time, people don’t even realize that those are two different things. There are articles where the title of the article is something like “explaining the rise in U.S. household debt” and then the first sentence of the article is, “why are U.S. households borrowing more than before?” Or even, “why are households saving less than before?” But these are different questions!

Of course it is true that insofar as someone borrows more money, their debt will rise; and if their income is unchanged their debt to income ratio will rise. This might in principle involve dis-saving, if the debt is financing increased consumption. In reality, though, it almost certainly doesn’t, since the great majority of debt is incurred to finance ownership of an asset. 

Setting aside the dissaving claim — which is almost always wrong, though you hear it very often — it is true that an increase in borrowing implies an increase in debt. But your debt-income ratio can change for other reasons as well.

Think about two people who buy houses: If one person buys a larger house, or a house in a more expensive area, or if they make a smaller down payment, then they will certainly owe more money over time than the other person. But if one person buys a house when the prevailing interest rate is low and the other buys an identical house with an identical downpayment when interest rates are high, and they each devote an identical part of their income to paying their mortgage down, then over time the debt of the person who bought when interest rates were low will be lower than the debt of the person who bought when interest rates were high. If you are fortunate enough to buy a house with a low mortgage rate then over time your debt will be lower than somebody who wasn’t so fortunate.

This is even more true in the aggregate. If you see households devoting a certain share of their income to purchasing the services of homes that they live in that they own, those same payments are going to result in in more debt when interest rates are high and less debt when interest rates are low. 

We also know that if you’re looking at a debt to income ratio, then as a ratio that has a denominator as well as a numerator. A more rapid increase in incomes — either what we call real incomes or incomes that rise because of inflation — will reduce that ratio of debt to income. And we know that if debt is written off, if the borrower defaults, then the debt ratio will also come down. 

All of these are factors that influence the level of debt independent of what we think of as the real flows of expenditure and the income. So what Arjun and I did — which is very simple once you think of doing it — is take various periods of time and see how much of the change in debt income ratios over each period is due to changes in borrowing behavior and how much is due to these other factors. We called the other factors, the ones independent of current expenditure and income, Fisher dynamics, for Irving Fisher. 

Fisher, incidentally, is an interesting figure in this context. On the one hand he was a very important advocate of this sort of neutral-money real-exchange vision we are criticizing. But he also in the 1930s wrote very persuasive account of the Great Depression in terms of financial factors — “The Debt Deflation Theory of Great Depressions” — where he explained the depth of the Depression by the fact that debt burdens rose even as borrowing fell, because prices and nominal incomes fell much faster than interest rates 

Our point was that this dynamic is not unique to the Great Depression. Any time you have higher or lower inflation, or higher or lower interest rates, that is going to affect debt burdens exactly the way it did in the Depression. And what we found is that if you’re looking at this rise in household debt to income ratios between 1980 and 2007, essentially all of it is explained by these other factors, these Fisher dynamics, and none of it is explained by increased borrowing. If you compare the period of rising household debt after 1980 to the previous two decades of more or less constant debt-income ratios, people were actually borrowing more in the earlier period than in the later period. 

The difference is that the interest rates facing households were much lower in the 1960s and 1970s than they were after the Volcker shock. The Volcker shock raised interest rates for households, and they stayed high for longer than the policy rate did. And during the 60s and 70s compared with the 1980 to 2007 period as a whole, inflation was significantly higher. (Real income growth was also a bit higher in the earlier period but that plays a smaller role.) 

So what we have here is not a story about real behavior. It’s not a story about borrowing, about income and expenditure. All of these stories that we heard from both the left and the right about why household debt had risen — it’s because people have grown impatient, their time preferences shifted or they are competing over status or it’s inequality — none of this is relevant, because people were not in fact borrowing more. 

Stepping back here, we can think of a set of monetary variables that scale up or scale down the weight of claims inherited from the past. Both interest rates and inflation function to change the value of claims in the form of debt inherited from the past, relative to incomes being generated today; and by the same token interest rates change the value of promises about future payment relative to incomes today. In an environment of abundant credit and low interest rates a promise about something you can deliver in the future, or an income you will receive in the future, is more valuable — it gives you a greater claim on income today. In an environment of low interest rates, what you will do, or can promise to do, in the future matters more; in an environment of high interest rates, and low inflation, what you did do in the past, the income you did receive, matters more.

This monetary rescaling of claims inherited from the past and claims generated by promises about the future, relative to income in the present — this is something that is constantly going on, in addition to whatever real activity people are carrying out. And many of the monetary outcomes that we’re interested in — like debt-income ratios — are fundamentally driven by this rescaling process and not by real activity. 

So these historical changes in household debt are a concrete application of the larger perspective that we’re trying to develop in this book. 

Another important application is the interest rate. How we think about the interest rate is central to a lot of the debates between different perspectives in economics, or maybe more precisely, it’s where the differences between them become visible, become unavoidable. 

One way I think about it: Imagine trying to lay a flat map over globe. You can do it  if your map is of just a little portion of the globe — we all know we have flat maps of various places that all exist on a sphere in reality, and they work okay.  But if you try to put your flat map over the whole globe it’s not going to work — either you’re going to have to crumple it up somewhere or it’s going to rip somewhere. The interest rate then is one of the sites where the flat map of this vision of the economy as a process of market exchange rips, when we try to fit it over a world of active transformative production through human cooperation into an unknown future. 

The way that you’re taught to think about the interest rate, if you get an economics education, is that it’s the price of savings, or loanable funds — it’s a trade-off between using the pot of resources that currently exist for consumption or for making the pot bigger in the future. We think, so much stuff was produced, some people have it, and if they don’t need it right now they can lend it to somebody else who’s going to use it to carry out production, which will mean more stuff in the future. In this view the interest rate is the price of consumption today in terms of consumption tomorrow. 

Interest, in this view, is a fundamentally non-monetary phenomenon: It’s a question of the real trade-offs imposed by people’s material needs and the material production they’re capable of.

This is a long-standing view — we can go back 200 years to Nassau Senior describing interest and profit as the reward for abstinence. By “abstinence” he means the deferring of enjoyment. The term has a nice moralizing religious tone to it, but the fundamental point is that the interest rate is the return on consuming later rather than earlier. We can find exactly the same thing in, let’s say, Gregory Mankiw’s textbook today. To quote:

Saving and investment can be interpreted in terms of supply and demand. In this case, the ‘good’ is loanable funds, and its ‘price’ is the interest rate. Saving is the supply of loanable funds    Investment is the demand for loanable funds—­ investors borrow from the public directly by selling bonds or indirectly by borrowing from banks. 

Here, again, we have a certain amount of stuff — it already exists  — and you can either use it now, or defer your enjoyment of it by lending it to somebody else who will use it productively. One striking thing about Mankiw’s formulation is that he makes a point of saying that it’s a matter of indifference whether this happens through banks or not. 

So in this vision, the interest rate is a trade-off between goods today and goods tomorrow, or goods used in consumption and goods used in production. But the fundamental problem, as soon as we start thinking about this in a real-world setting, is that it doesn’t seem to match up at all with the interest rate as we actually observe it.

One of the first things you learn if you get a Keynes-flavored economics education, but also something that anyone who deals with this stuff practically realizes, is that when you go to the bank to get a loan, the bank is not making that loan out of anybody’s savings. A bank makes a loan by creating two offsetting IOUs. There is the bank’s IOU you to you, which we call a deposit, and your IOU to the bank, which we call a loan. The deposit is newly created in the process of making the loan — it’s what used to be called fountain pen money, it’s ledger money, it consists of two offsetting entries in a ledger. Nobody’s savings are involved. Nobody else needs to defer their consumption to allow you and I to write IOUs to each other.  

There’s a very nice explainer from the Bank of England on how banks create money which you can look up online, that lays this out very clearly. I assign it to my undergraduates every year. It’s not a secret that loans, in the real world, do not involve somebody taking some goods that they have in their possession and bringing them to some kind of central clearing house where somebody else can check out the goods to use in some production process. When you get a loan, you’re not receiving a bag of cash that someone else brought into the bank. You’re getting a deposit, which is just a record kept by the bank. Fundamentally, a loan is the creation out of thin air of two offsetting promises of money payment. 

Now of course when you receive your promise from the bank — in other words, your deposit — you will normally use that to acquire title to some goods and services, or authority over somebody else’s labor. But the loan itself did not require anyone to have already decided to let you use those goods. It did not require anyone’s prior act of saving.

Of course anybody can write an IOU. You and I could sit down and write promises to each other, just as you and the bank do when you get a loan. The key thing about the bank, here, is that its promise is more credible than yours. If I ask for your bicycle and promise to give you something of equal value down the road, you probably won’t agree. But I can make that same promise to bank, and the bank can then make that promise to you. And that’s fine. 

This is why Hyman Minsky, the great theorist of finance, said that the defining function of banks is  not intermediation, but acceptance. You can’t get a claim on labor, on real resources, simply by promising you’ll do something useful with them. But a bank might accept your promise, and then the promise that it makes to you in return can can be transferred on to other people in return for a claim on real resources, which you can use to create new forms of production that otherwise wouldn’t exist. And this is the other side of the Keynesian vision — the fact that banks can create money by lending allows for the reorganization of productive activity in new ways that wouldn’t be possible otherwise.

If you’re a business owner, say, you can now expand your business, because the bank’s promise is more credible than your promise. You as a business owner cannot hire workers simply by saying this business is going to be successful and I’ll give you a share in it — well,  if you’re in Silicon Valley sometimes you can, but most businesses can’t. The bank’s promise is more credible — unlike yours, it will be accepted by workers as payment. You can use this loan created out of thin air to carry out new activities, to create things that did not exist before.

The problem for the orthodox view is that banks exist. Banks exist and, to anyone taking a naive look at capitalism, they seem rather important. Trading money claims is evidently pretty central to the way that we organize our activity. 

Central banks also exist, and influence the terms on which banks make loans, even though they themselves don’t do any saving or investing. If you believe the story in the Mankiw textbook that the supply of savings is being traded against the demand for investment and that’s what determines the interest rate — well, a central bank is neither providing loanable funds nor is it using loanable funds for investment, and it doesn’t restrict the terms on which anyone is allowed to make private contracts. So how could it influence the price of loanable funds?

Wheres if we think of the interest rate as being a combination of the price of liquidity — flexibility — and a conventional price set in asset markets, then it is much easier to see the critical role of banks, and why central banks are able to influence it.  This is something we spend a lot of time on in the book.

Now, once common way of reconciling the idea of a savings-determined “real” interest rate with the monetary interest rate we see in the real-world financial system is through the notion of a “natural interest rate”. This is the idea that, ok, there is here on Earth an interest rate that is set within the banking system that has to do with the terms on which promises of money payments are made. But there’s another interest rate that exists in some more abstract world, which we can’t see directly, but somehow corresponds to the way goods today trade off against goods tomorrow, or the way they would trade off if markets functioned perfectly. This second interest rate is what’s called the natural rate. The actual rate might not always follow it. But it should. 

As an aside, I should say that this sort of transformation of a descriptive claim, that is supposed to be a statement about how things actually work, into a prescriptive claim about how things should work, is very common in economics. 

We can find a very nice statement of this view from Milton Friedman on the natural rate of interest and its cousin the natural rate of unemployment, where he describes them as the rates that would be

ground out by the Walrasian system of general equilibrium equations, provided there is embedded in them the actual structural characteristics of the labor and commodity markets, including market imperfections, stochastic variability of demands and supplies, the cost of information about job vacancies and mobility, and so on.

In other words, if we could somehow make a perfect model of the economy, then we could calculate what the natural rate would be, and that’s the thing we should be trying to achieve with our policy influencing the interest rate. Obviously, as soon as you start thinking about it, this doesn’t make sense on multiple levels. But it’s a very attractive formulation precisely because it papers over this gap between a theoretical and ideological vision of interest that sees it as a real trade-off between the present and future, and the actual concrete reality of interest that is determined in financial markets on the basis of liquidity and convention. 

So again, if you come more recently, you look at Jerome Powell talking about monetary policy in a changing economy, a speech he gave a few years ago. There he introduces the idea of r*, the natural rate of interest, by saying, “in conventional models of the economy, major economic quantities such as inflation, unemployment, and the growth rate fluctuate around values that are considered normal, natural, or desired.” 

I think that’s a very nice illustration of the thinking here, because normal, natural, and desired are three different things, and this r* is conflating them all together. Which is it? Is it normal, as in typical or average? Is it natural? (What would it mean for an interest rate to be artificial?) Or is it desired? In fact, it’s whatever the central bank wants. But the slippage between these different concepts is essential to the function of ideas like the natural rate. 

Think of the transmission in a car: You’ve got a clutch, because the engine is turning at one speed, and the wheels are turning at a different speed. If they just join up, you’re going to shatter your drive shaft. So you have two discs that can turn independently of each other, but also exert some force on each other, so you get a smooth connection between two systems that are behaving in different ways. In this case r* is the clutch between theory that’s going one way and the reality, which the central bank has to acknowledge is going in a different way. The ambiguity of the term is itself normal, natural, and desired.

So then Powell continues, these natural values are “operationalized as views on the longer-run normal values of the growth rate of GDP, the unemployment rate, and the federal funds rate, which depend on fundamental structural features of the economy.” Here again there is a conflation between the things that the central bank is trying to do, things that are the sort of normal, average, expected, long-run outcomes, and things that are in some sense determined by some set of non-monetary fundamentals independent of monetary activity. And again, you get a controlled slippage between these different concepts.

There’s another nice version of this from a group of economists associated with the European Central Bank. They say, at its most basic level, the interest rate is the price of time, the remuneration for postponing spending into the future. So this, again, this is Nassau Senior.

It’s abstinence. It’s the price of waiting for your enjoyment. So this sounds like something that should be purely non-monetary.

This is r*. And then the ECB economists say, “while unobservable, r* provides a useful guidepost for monetary policy as it captures the level of interest rates which monetary policy can be considered neutral.” 

I just love the idea of an unobservable guidepost. It’s a perfect encapsulation of how the natural rate concept functions. 

Because, of course, what’s really going on here is the central bank sets the interest rate at a level that they think will achieve their macroeconomic objectives, whatever they are. Inflation is too high. We need a higher interest rate. Unemployment is too high. We need a lower interest rate. Maybe we’re concerned about the exchange rate. Maybe we’re concerned about the state of financial markets. Whatever they’re most worried about, they choose an interest rate that they hope will help. 

And then after the fact, they can say, well, we wrote down a model in which this would be the interest rate, so therefore it is the natural interest rate. There’s no genuine content there — r* and the associated models are just a way of describing whatever you’re doing as conforming to a natural outcome that is dictated by the fundamentals out of your control, as opposed to a conscious political choice that prioritizes some outcomes above others. This sort of ideological construct is fundamental in depoliticizing one of the main sites of economic management in modern economies. 

And this is an important part of the story that we’re trying to tell in this book. The problem, if you believe in a more egalitarian, democratic, or socialist vision of the economy, is not simply, is not even mainly, that right now the world is organized through markets, and we’re going to have to come up with some better economic system to replace markets. The reality is the world is not primarily organized through markets. What we have, very often, are imaginary market outcomes being claimed as the unobservable guideposts so that people with authority claim to be following them. We have an ideological system that allows processes of power and planning to present themselves as somehow representing or standing in for market outcomes. 

Another area where I think this comes through very clearly is in the history of the corporation. We wrote a lot on this which we were, unfortunately, not able to fit into this book — it will be in another book. But it’s a good illustration of the larger vision we are trying to develop.

If you look at the way people talk about our economy, almost across the political spectrum, they will describe it as a market economy. We have all kinds of outcomes that are dictated by markets, decisions about production are guided by prices, the economy is organized through market exchange. 

And, at least among economists, the way we talk about production implicitly treats it as just a special kind of market. 

This is certainly the way economic textbooks approach production. We talk about labor markets, and capital markets. We imagine production as a process where someone purchases a certain amount of labor and a certain amount of capital, puts them in a pot, and gets a certain amount of salable output at the other end.

But when you look at how corporations work, it’s very clear that they are not organized as markets. They’re not internally structured through money payments — yes, of course, workers have to paid a wage to show up, but once they are there there isn’t some kind of market for their services. The boss just tells them what to do. Nor are corporations organized internally around the pursuit of profit, though that obviously guides how they relate to the outside world.

Now, historically, we can find cases of businesses whose internal structures are more market-like. Some of the first large corporations were organized through what were called inside contractors. You would you hire a skilled craftsman, artisan, who comes and works in the physical space, but is responsible for hiring their own assistants, buying their own materials, working them up and then selling them on to  the next inside contractor. 

That turned out to be not a very good of organizing a corporation, even when they were they producing the sort of thing — clothing, say — that could in principle be made by independent artisans. It didn’t work at all for large-scale industrial production. It’s obviously not the way corporations are organized today. We would argue that a central through-line of the history of the corporation is a fundamental conflict between the organization of production in large-scale, ongoing, socially embedded forms, and the logic of money and markets that surrounds them, and that the claims upon them by wealth holders continue to be exercised through. 

If we go back to what many people would consider the first modern corporation, the East India Corporation, we find right at its beginning the first conflict between shareholders and managers. The original structure had been a kind of pooling of resources between a number of independent merchants for joint operations in the East for 20 years, after which they would sell any remaining assets, divide up the profits, and dissolve the corporation. That was the legal form. 

But the East India Corporation turned out to be very successful at its mix of trade and piracy. People have argued that this hybrid of trade and warfare was really Europe’s specialty, the one thing it did better than the rest of the Old World. In any case, East India Company was very successful at it. But — and this is the key thing — it required a big investment in forts, soldiers, local political alliances. Things that can’t just be sold off and divided among the partners.

So after 20 years, this is a very successful enterprise, and the people running it would like to keep operating it and believe they can do so profitably. And now the shareholders are saying, it’s time to divide everything up. But of course, if you sell off the forts and so on, they’re no longer of any value. And so there was a long conflict —legal, political —  that ended with the managers winning, the shareholders losing, and the corporation being allowed to continue operating. 

Losing the legal fight turned out to be good news for the shareholders. The company  continued paying out large dividends. It never once raised any funds in the stock market. It continued operating and paying dividends for hundreds of years out of its own profits.

There are two interesting things about this story, to me. 

First of all, right from the beginning, we have a conflict between an ongoing process of production which has real material benefits, and the claims by the elite against that process, which they would like to exercise in the form of money. If you operate forts and you have ships and you have your local allies, then you can carry out trading and trading-slash-piracy activities that you can’t do without those things. But once you’ve laid out money to build a fort, you own a fort. It remains a fort. You can’t turn it back into money. And you, as a wealth owner, put your money out to get more money. You don’t want to be master of a fort. You want a liquid financial claim that you can trade. 

The other point is that the financial side of the operation is not about pooling money. It’s not about raising capital. 

The East India Company, again, continues having shareholders, continues paying dividends in order to satisfy their claims, despite never raising funds from the stock market over the next 200 years of their existence. Whatever the stock market is doing here, it’s not a system for getting real resources into the corporation. 

We can find this same principle down through the history of the corporation. When in the beginning of the 20th century we see the generalization of the corporate form, it’s not a process where large-scale investment required raising more funds. The problem that the corporation is solving is that you have large-scale enterprises with long-lived specialized fixed assets, on the one hand, and wealth owners, on the other hand, with claims on those enterprises — often the owners of smaller enterprises that merge into one larger one, or the heirs of the founder — who don’t want an interest in this particular company. They want money. And so the function of the corporate form is to allow the conversion of ownership rights into money — to enable payments that will satisfy these claimants, so that their authority over the production process can be pooled, their smaller interests can be assembled into a larger whole. 

This is not a system for raising funds for investment. It’s a system for consolidating authority. It’s a system for reconciling the need for large-scale, long-lived organizational production, on the one hand, with the desire of the wealthy to hold their wealth in a more money-like form, on the other. As William Lazonick says, the corporation is not a vehicle for raising funds for investment, it’s a vehicle for distributing money to the wealthy. The origin of the corporation as we know it is as a vehicle for moving funds out of productive enterprises to asset-owners. 

We can see this same conflict in the shareholder revolution of the 1980s, where people like Michael Jensen argued that the existing managers of corporations were too focused on the survival and growth of the enterprise as such. Managers were too interested in the particular productive process that they were stewards of, as opposed to generating money payments to shareholders, to finance.

What we see again and again is that  production depends on ongoing relationships — many of them, obviously, hierarchical, others based around cooperation, or on what David Graeber calls baseline communism, or on people’s intrinsic motivation to do their work well. But not on arm’s-length market relationships. 

Our argument is that, yes, under capitalism, money expands itself by being committed to production. But there is a fundamental conflict between the logic of production and the logic of money. 

Through the whole history of capitalism we have this conflict. Owners of money want more money. So they commit their money — their claim on society — to some particular enterprise, which they hope will return more money to them in the future. But in the meantime, the participants in that enterprise want to operate it, expand it, according to its own particular logic. Almost everyone here has probably encountered Marx’s formula M-C-P-C-M’. But the point that Arjun and I are trying to call attention to, is, how, or whether, C’ turns back into M’ is a tricky political question. 

From the point of view of  particular enterprise, the conversion back to money appears as a kind of imposition, a demand from outside. The enterprise can reproduce itself on its own terms with a claim on certain use values for which it produces other use values in return. 

Where money is necessary — this is important — is where something new is being done, where there’s a need to organize production in some new way, for coordination between strangers who don’t have a relationship with each other. Money is genuinely productive insofar as the development of our productive capacity requires breaking up existing ways of organizing production, dissolving existing relationships, extinguishing obligations, and starting from square one. 

Money should be seen as a specific kind of technology of social coordination. It’s a way of organizing human activity in new ways that it hasn’t been organized before. 

One way to think of this is of money as a sort of catalyst. On the one hand, it acts as a social solvent. It breaks up existing relationships, as Marx and Engels famously described in the Communist Manifesto — “all that solid melts into air”. It replaces social ties with the callous cash nexus. 

We can all think of examples of this. Money is a way of erasing relationships. A money payment replaces some ongoing connection between people. It takes an existing obligation and it extinguishes it. Money is a tool for breaking social ties, for replacing production that’s organized through ties of affinity, of affection, of kinship, of obligation, with arms-length cooperation between strangers, who could walk away from each other and never see each other again. Money says, we are done, we are settled, we owe nothing more to each other. 

But that is only the first step. Because after we have broken up these smaller social molecules, these smaller-scale structures of production, after we have broken up the organization of production through a family, a village, a guild, that is not the end of the story. 

Money facilitates cooperation among strangers, and it makes strangers out of family and friends. But people do not remain strangers. People who are engaged in cooperative activity of whatever kind form new social ties and new connections. This is partly because, organically, human beings connect to each other, and partly because the activity of production requires it. 

Production requires cooperation beyond what you can get through arms-length transactions. It requires intrinsic motivation, it requires trust, it requires people’s desire to do their job well and their loyalty to other people. And it requires, at least in our society, command and hierarchy, which in turn requires some form of legitimacy. People have to know who can give what commands. 

All of that involves the creation of social relationships. You can see money as a moment, in which older, smaller-scale forms of cooperation are broken up, creating the possibility for the reassembly of their components into larger forms of cooperation, larger-scale cooperation. The organization of society through money is a temporary stopping point. 

What’s interesting is that if you go back to the  late 19th century, the early 20th century, this was something many people perceived as almost inevitable. If you read the next-to-last chapter of Capital,  Marx’s vision is essentially this: Having broken up the older forms of small-scale property and small-scale production and reassembled human activity in the form of large-scale cooperation, an extensive division of labor, production based on conscious scientific knowledge — after all that,  it will be, he says, “infinitely less violent” to replace that with socialism than it was to break up all of those smaller structures earlier. Does Marx say that we’ll just look out the window one day and say, oh, hey, it’s socialism? No. But it’s not that far off.

Or similarly, you can find Keynes writing in the 1920s saying that the most striking fact about the world that he sees around him is the tendency of large enterprises to socialize themselves. Corporations, having been established to carry out some particular purpose, to produce some concrete use value, becomes oriented towards the production of that use value. They cease to be oriented towards producing profits for their shareholders. 

This is, in some sense, the same story that shareholder advocates like Michael Jensen told  in the 70s and 80s. Except that they saw it not as the march of history, but as a problem to be overcome. And this is the point that we come back to in our book. In practice, productive activity is overwhelmingly organized in non-market ways. But acknowledgment of this fact is profoundly threatening to elites, whose claim on society is expressed in terms of money.

This is the point. We don’t see how much of our life is already organized in non-market ways.  

We all of us in this room came here for non-market reasons. None of us was paid to be here. None of us came here because a market signal told us to. 

There are, obviously, payments that organize the operation of this building. But there is also an activity taking place in this room, in this building, that is not a market outcome, that is not organized through money payments, that doesn’t produce or respond to price changes. 

Education is an activity that is particularly resistant to organization through markets and money payments and the pursuit of profit. But it’s not unique. Many of us came here on the MTA, an institution that was set up originally according to the logic of markets and money payments. But that didn’t work for running a transit system. The MTA didn’t become public because of an ideological crusade to socialize it. It became public because it could not simultaneously fulfill its social function while still being operated profitably. So the state had to take it over. 

What we see around us is that the organization of production in practice calls for non-market forms — money does not perform the coordinating role that it purports to. But what we also see is that the structures of hierarchy and authority in our society very often justify themselves and legitimate themselves as if they were forms of market coordination. Money and property rights become badges of authority that are worn by the people who in fact issue commands through systems of hierarchy and personal domination. 

The great challenge that we face if we wish to transform this system is not that we need to find new ways of non-market coordination. It is to find ways of democratizing the forms of planning and hierarchy that exist. We do not have to ask, well, how do we organize production without markets? — because we already do. 

The great challenge is the enormous resources of violence in the hands of money owners,  and their willingness to see the existing organization of collective action wrecked rather than allowing it to socialize itself, no matter how strongly the actual needs of production point in that direction. 

The problem — the fundamental problem,  at this moment it feels clearer than ever — is how to overcome the enormous powers of coercion and violence in the hands of those whose status and authority is expressed through money. 

At Barron’s: Americans Owe Less Than They Used To. Will the Fed Change That?

(I write a monthly opinion piece for Barron’s. This one was published there in September.)

Almost everyone, it seems, now agrees that higher interest rates mean economic pain. This pain is usually thought of in terms of lost jobs and shuttered businesses. Those costs are very real. But there’s another cost of rate increases that is less discussed: their effect on balance sheets.

Economists tend to frame the effects of interest rates in terms of incentives for new borrowing. As with (almost) anything else, if loans cost more, people will take less of them. But interest rates don’t matter only for new borrowers, they also affect people who borrowed in the past. As debt rolls over, higher or lower current rates get passed on to the servicing costs of existing debt. The effect of interest rate changes on the burden of existing debt can dwarf their effect on new borrowing—especially when debt is already high.

Let’s step back for a moment from current debates. One of the central macroeconomic stories of recent decades is the rise in household debt. In 1984, it was a bit over 60% of disposable income, a ratio that had hardly changed since 1960. But over the next quarter-century, debt-income ratios would double, reaching 130%. This rise in household debt was the background of the worldwide financial crisis of 2007-2008, and made household debt a live political question for the first time in modern American history.

Household debt peaked in 2008; it has since fallen almost as quickly as it rose. On the eve of the pandemic, the aggregate household debt-income ratio stood at 92%—still high, by historical standards, but far lower than a decade before.

These dramatic swings are often explained in terms of household behavior. For some on the political right, rising debt in the 1984-2008 period was the result of misguided government programs that encouraged excessive borrowing, and perhaps also a symptom of cultural shifts that undermined responsible financial management. On the political left, it was more likely to be seen as the result of financial deregulation that encouraged irresponsible lending, along with income inequality that pushed those lower down the income ladder to spend beyond their means.

Perhaps the one thing these two sides would agree on is that a higher debt burden is the result of more borrowing.

But as economist Arjun Jayadev and I have shown in a series of papers, this isn’t necessarily so. During much of the period of rising debt, households borrowed less on average than during the 1960s and 1970s. Not more. So what changed? In the earlier period, low interest rates and faster nominal income growth meant that a higher level of debt-financed expenditure was consistent with stable debt-income ratios.

The rise in debt ratios between 1984 and 2008, we found, was not mainly a story of people borrowing more. Rather, it was a shift in macroeconomic conditions that meant that the same level of borrowing that had been sustainable in a high-growth, low-interest era was unsustainable in the higher-interest environment that followed the steep rate hikes under Federal Reserve Chair Paul Volcker. With higher rates, a level of spending on houses, cars, education and other debt-financed assets that would previously have been consistent with a constant debt-income ratio, now led to a rising one.

(Yes, there would later be a big rise in borrowing during the housing boom of the 2000s. But this is not the whole story, or even the biggest part of it.)

Similarly, the fall in debt after 2008 in part reflects sharply reduced borrowing in the wake of the crisis—but only in part. Defaults, which resulted in the writing-off of about 10% of household debt over 2008-2012, also played a role. More important were the low interest rates of these years. Thanks to low rates, the overall debt burden continued to fall even as households began to borrow again.

In effect, low rates mean that the same fraction of income devoted to debt service leads to a larger fall in principal—a dynamic any homeowner can understand.

The figure nearby illustrates the relative contributions of low rates and reduced borrowing to the fall in debt ratios after 2008. The heavy black line is the actual path of the aggregate household debt-income ratio. The red line shows the path it would have followed if households had not reduced their borrowing after 2008, but instead had continued to take on the same amount of new debt (as a share of their income) as they did on average during the previous 25 years of rising debt. The blue line shows what would have happened to the debt ratio if households had borrowed as much as they actually did, but had faced the average effective interest rate of that earlier period.

As you can see, both reduced borrowing and lower rates were necessary for household debt to fall. Hold either one constant at its earlier level, and household debt would today be approaching 150% of disposable income. Note also that households were paying down debt mainly during the crisis itself and its immediate aftermath—that’s where the red and black lines diverge sharply. Since 2014, as household spending has picked up again, it’s only thanks to low rates that debt burdens have continued to fall.

(Yes, most household debt is in the form of fixed-rate mortgages. But over time, as families move homes or refinance, the effective interest rate on their debt tends to follow the rate set by the Fed.)

The rebuilding of household finances is an important but seldom-acknowledged benefit of the decade of ultra-low rates after 2007. It’s a big reason why the U.S. economy weathered the pandemic with relatively little damage, and why it’s growing so resiliently today.

And that brings us back to the present. If low rates relieved the burden of debt on American families, will rate hikes put them back on an unsustainable path?

The danger is certainly real. While almost all the discussion of rate hikes focuses on their effects on new borrowing, their effects on the burden of existing debt are arguably more important. The 1980s—often seen as an inflation-control success story—are a cautionary tale in this respect. Even though household borrowing fell in the 1980s, debt burdens still rose. The developing world—where foreign borrowing had soared in response to the oil shock—fared much worse.

Yes, with higher rates people will borrow less. But it’s unlikely they will borrow enough less to offset the increased burden of the debt they already have. The main assets financed by credit—houses, cars, and college degrees—are deeply woven into American life, and can’t be easily foregone. It’s a safe bet that a prolonged period of high rates will result in families carrying more debt, not less.

That said, there are reasons for optimism. Interest rates are still low by historical standards. The improvement in household finances during the post-2008 decade was reinforced by the substantial income-support programs in the relief packages Congress passed in response to the pandemic; this will not be reversed quickly. Continued strong growth in employment means rising household incomes, which, mechanically, pushes down the debt-income ratio.

Student debt cancellation is also well-timed in this respect. Despite the fears of some, debt forgiveness will not boost  current demand—no interest has been paid on this debt since March 2020, so the immediate effect on spending will be minimal. But forgiveness will improve household balance sheets, offsetting some of the effect of interest rate hikes and encouraging spending in the future, when the economy may be struggling with too little demand rather than (arguably) too much.

Reducing the burden of debt is also one of the few silver linings of inflation. It’s often assumed that if people’s incomes are rising at the same pace as the prices of the things they buy, they are no better off. But strictly speaking, this isn’t true—income is used for servicing debt as well as for buying things. Even if real incomes are stagnant or falling, rising nominal incomes reduce the burden of existing debt. This is not an argument that high inflation is a good thing. But even bad things can have benefits as well as costs.

Will we look back on this moment as the beginning of a new era of financial instability, as families, businesses, and governments find themselves unable to keep up with the rising costs of servicing their debt? Or will the Fed be able to declare victory before it has done too much damage? At this point, it’s hard to say.

Either way we should focus less on how monetary policy affects incentives, and more time on how it affects the existing structure of assets and liabilities. The Fed’s ability to steer real variables like GDP and employment in real time has, I think, been greatly exaggerated. Its long-run influence over the financial system is a different story entirely.

Fisher Dynamics Revisited

Back in the 2010s, Arjun Jayadev and I wrote a pair of papers (one, two) on the evolution of debt-income ratios for US households. This post updates a couple key findings from those papers. (The new stuff begins at the table below.)

Rather than econometric exercises, the papers were based on a historical accounting decomposition —  an approach that I think could be used much more widely. We separated changes in the debt-income ratio into six components — the primary deficit (borrowing net of debt service payments); interest payments; real income growth; inflation; and write downs of debt through default — and calculated the contribution of each to the change in debt ratios over various periods. This is something that is sometimes done for sovereign debt but, as far as I know, we were the first to do it for private debt-income ratios.

We referred to the contributions of the non-borrowing components as “Fisher dynamics,” in honor of Irving Fisher’s seminal paper on depressions as “debt deflations.” A key aspect of the debt-deflation story was that when nominal incomes fell, the burden of debt could rise even as debtors sharply reduced new borrowing and devoted a greater share of their income to paying down existing debt. In Fisher’s view, this was one of the central dynamics of the Great Depression. Our argument was that something like a slow-motion version of this took place in the US (and perhaps elsewhere) in recent decades.

The logic here is that the change in debt-income ratios is a function not only of new borrowing but also of the effects of interest, inflation and (real) income growth on the existing debt ratio, as well as of charge offs due to defaults.

Imagine you have a mortgage equal to double your annual income. That ratio can go down if your current spending is less than your income, so that you can devote part of your income to paying off the principal. Or it can go down if your income rises, i.e. by raising the denominator rather than lowering the numerator. It can also go down if you refinance at a lower interest rate; then the same fraction of your income devoted to debt service will pay down the principal faster. Our of course it can go down if some or all of it is written off in bankruptcy.

It is possible to decompose actual historical changes in debt-income ratios for any economic unit or sector into these various factors. The details are in either of the papers linked above. One critical point to note: The contributions of debt and income growth are proportional to the existing debt ratio, so the higher it already is, the more important these factors are relative to the current surplus or deficit.

Breaking out changes in debt ratios into these components was what we did in the two papers. (The second paper also explored alternative decompositions to look at the relationship been debt ratio changes and new demand from the household sector.) The thing we wanted to explain was why some periods saw rising debt-income ratios while others saw stable or falling ones.

While debt–income ratios were roughly stable for the household sector in the 1960s and 1970s, they rose sharply starting in the early 1980s. The rise in household leverage after 1980 is normally explained in terms of higher household borrowing. But increased household borrowing cannot explain the rise in household debt after 1980, as the net flow of funds to households through credit markets was substantially lower in this period than in earlier postwar decades. During the housing boom period of 2000–2007, there was indeed a large increase in household borrowing. But this is not the case for the earlier rise in household leverage in 1983–1990, when the debt– income ratios rose by 20 points despite a sharp fall in new borrowing by households.

As we explained:

For both the 1980s episode of rising leverage and for the post-1980 period as a whole, the entire rise in debt–income ratios is explained by the rise in nominal interest rates relative to nominal income growth. Unlike the debt deflation of the 1930s, this ‘debt disinflation’ has received little attention from economists or in policy discussions.

Over the full 1984–2011 period, the household sector debt–income ratio almost exactly doubled… Over the preceding 20 years, debt–income ratios were essentially constant. Yet households ran cumulative primary deficits equal to just 3 percent of income over 1984–2012 (compared to 20 percent in the preceding period). The entire growth of household debt after 1983 is explained by the combination of higher interest payments, which contributed an additional 3.3 points per year to leverage after 1983 compared with the prior period, and lower inflation, which reduced leverage by 1.3 points per year less.

We concluded:

From a policy standpoint, the most important implication of this analysis is that in an environment where leverage is already high and interest rates significantly exceed growth rates, a sustained reduction in household debt–income ratios probably cannot be brought about solely or mainly via reduced expenditure relative to income. …There is an additional challenge, not discussed in this paper, but central to both Fisher’s original account and more recent discussions of ‘balance sheet recessions’: reduced expenditure by one sector must be balanced by increased expenditure by another, or it will simply result in lower incomes and/or prices, potentially increasing leverage rather than decreasing it. To the extent that households have been able to run primary surpluses since 2008, it has been due mainly to large federal deficits and improvement in US net exports.

We conclude that if reducing private leverage is a policy objective, it will require some combination of higher growth, higher inflation, lower interest rates, and higher rates of debt chargeoffs. In the absence of income growth well above historical averages, lower nominal interest rates and/or higher inflation will be essential. … Deleveraging via low interest rates …  implies a fundamental shift in monetary policy. If interest-rate policy is guided by the desired trajectory of debt ratios, it no longer can be the primary instrument assigned to managing aggregate demand. This probably also implies a broader array of interventions to hold down market rates beyond traditional open market operations, policies sometimes referred to as ‘financial repression.’ Historically, policies of financial repression have been central to almost all episodes where private (or public) leverage was reduced without either high inflation or large-scale repudiation.

These papers only went through 2011. I’ve thought for a while it would be interesting to revisit this analysis for the more recent period of falling household debt ratios. 

With the help of Arjun’s student Advait Moharir, we’ve now brought the same analysis forward to the end of 2019. Stopping there was partly a matter of data availability — the BEA series on interest payments we use is published with a considerable lag. But it’s also a logical period to look at, since it brings us up to the start of the pandemic, which one would want to split off anyway.

The table below is a reworked version of tables in the two papers, updated through 2019. (I’ve also adjusted the periodization slightly.) 

Due to …
Period Annual PP Change in Debt Ratio Primary Deficit Interest Growth Inflation Defaults
1929 – 1931 3.7 -5.5 2.9 2.8 2.9 *
1932 – 1939 -1.2 -1.5 2.4 -1.6 -0.7 *
1940 – 1944 -3.8 -1.6 1.3 -2.5 -1.9 *
1945 – 1963 2.6 2.5 2.6 -1.5 -0.8 *
1964 – 1983 0.0 0.8 5.1 -2.4 -3.5 *
1984 – 1999 1.7 -0.3 7.5 -2.9 -2.1 -0.4
2000 – 2008 4.5 2.4 7.2 -1.7 -2.5 -0.8
2009 – 2013 -5.4 -3.7 5.8 -3.1 -2.3 -2.4
2014 – 2019 -2.0 -1.4 4.6 -3.4 -1.3 -0.6

Again, our central finding in the earlier papers was that if we compare the 1984-2008 period of rising debt ratios to the previous two decades of stable debt ratios, there was no rise in the primary deficit. For 1984-2008 as a whole, annual new borrowing exceeded debt service payments by 0.7 percent of income on average, almost exactly the same as during the 1964-1983 period. (That’s the weighted average of the two sub-periods shown in the table.) Even during the housing boom period, when new borrowing did significantly exceed debt service, this explained barely a third of the difference in annual debt-ratio growth (1.6 out of 4.5 points).

The question now is, what has happened since 2008? What has driven the fall in debt ratios from 130 percent of household income in 2008 to 92 percent on the eve of the pandemic?

In the immediate aftermath of the crisis, sharply reduced borrowing was indeed the main story. Of the 10-point swing in annual debt-ratio growth (from positive 4.5 points per year to negative 5.4), 6 points is accounted for by the fall in net borrowing (plus another 1.5 points from higher defaults). But for the 2014-2019 period, the picture is more mixed. Comparing those six years to the whole 1984-2008 period of rising debt, we have a 4.7 point shift in debt ratio growth, from positive 2.7 to negative 2. Of that, 2.1 points is explained by lower net borrowing, while almost 3 points is explained by lower interest. (The contribution of nominal income growth was similar in the two periods.) So if we ask why household debt ratios continued to fall over the past decade, rather than resuming their rise after the immediate crisis period, sustained low interest rates are at least as important as household spending decisions. 

Another way to see this is in the following graph, which compares three trajectories: The actual one in black, and two counterfactuals in red and blue. The red counterfactual is constructed by combining the average 1984-2008 level of net borrowing as a fraction of income to the actual historical rates of interest, nominal income growth and defaults. The blue counterfactual is similarly constructed by combining the average 1984-2008 effective interest rate with historical levels of net borrowing, nominal income growth and defaults. In other words, the red line shows what would have happened in a world where households had continued to borrow as much after 2008 as in the earlier period, while the blue line shows what would have happened if households had faced the same interest rates after 2008 as before. 

As the figure shows, over the 2008-2019 period as a whole, the influence of the two factors is similar — both lines end up in the same place. But the timing of their impact is different. In the immediate wake of the crisis, the fall in new borrowing was decisive — that’s why the red and black lines diverge so sharply. But in the later part of the decade, as household borrowing moved back toward positive territory and interest rates continued to fall, the more favorable interest environment became more important. That’s why the blue line starts rising after 2012 — if interest rates had been at their earlier level, the borrowing we actually saw in the late 2010s would have implied rising debt ratios. 

As with the similar figures in the papers, this figure was constructed by using the law of motion for debt ratios:

where b is the debt-income ratio, d is the primary deficit, is the effective interest rate (i.e. total interest payments divided by the stock of debt), g is income growth adjusted for inflation, π is the inflation rate, and sfa is a stock-flow adjustment term, in this case the reduction of debt due to defaults. The exact sources and definitions for the various variables can be found in the papers. (One note: We do not have a direct measurement of the fraction of household debt written off by default for the more recent period, only the fraction of such debt written down by commercial banks. So we assumed that the ratio of commercial bank writeoffs of household debt to total writeoffs was the same for the most recent period as for the period in which we have data for both.)

Starting from the actual debt-ratio in the baseline year (in this case, 2007), each year’s ending debt-income ratio is calculated using the primary deficit (i.e. borrowing net of debt service payments), the share of debt written off in default, nominal income growth and the interest rate. All but one of these variables are the actual historical values; for one, I instead use the average value for 1984-2007. This shows what the path of the debt ratio would have been if that variable had been fixed at its earlier level while the others evolved as they did historically.  In effect, the difference between these counterfactual lines and the historical one shows the contribution of that variable to the difference between the two periods.

Note that the interest rate here is not the current market rate, but the effective or average rate, that is, total interest payments divided by the stock of debt. For US households, this fell from around 6 percent in 2007 to 4.4 percent by 2019 — less than the policy rate did, but still enough to create a very different trajectory, especially given the compounding effect of interest on debt over time. So while expansionary monetary policy is not the whole story of falling debt ratios since 2008, it was an important part of it. As I recently argued in Barrons, the deleveraging of US households is unimportant and under appreciated benefit of the decade of low interest rates after the crisis.

 

Saving and Borrowing: A Response to Klein

Matthew Klein has a characteristically thoughtful post disagreeing with my new paper on income distribution and debt. I think his post has some valid arguments, but also, from my point of view, some misunderstandings. In any case, this is the conversation we should be having.

I want to respond on the specific points Klein raises. But first, in this post, I want to clarify some background conceptual issues. In particular, I want to explain why I think it’s unhelpful to think about the issues of debt and demand in terms of saving.

Klein talks a great deal about saving in his post. Like most people writing on these issues, he treats the concepts of rising debt-income ratios, higher borrowing and lower saving as if they were interchangeable. In common parlance, the question “why have households borrowed more?” is equivalent to “why have households saved less?” And either way, the spending that raises debt and reduces saving, is also understood to contribute to aggregate demand.

This conception is laid out in Figure 1 below. These are accounting rather than causal relationships. A minus sign in the link means the relationship is negative.

 

We start with households’ decision to consume more or less out of their income. Implicitly, all household outlays are for consumption, or at least, this is the only flow of household spending that varies significantly. An additional dollar of household consumption spending means an additional dollar of demand for goods and services; it also means a dollar less of savings. A dollar less of savings equals a dollar more of borrowing. More borrowing obviously means higher debt, or — equivalently in this view — a higher debt-GDP ratio.

There’s nothing particularly orthodox or heterodox about this way of looking at things. You can hear the claim that a rise in the household debt-income ratio contributes more or less one for one to aggregate demand as easily from Paul Krugman as from Steve Keen. Similarly, the idea that a decline in savings rates is equivalent to an increase in borrowing is used by Marxists as well as by mainstream economists, not to mention eclectic business journalists like Klein. Of course no one actually says “we assume that household assets are fixed or nonexistent.” But implicitly that’s what you’re doing when you treat the question of what has happened to household borrowing as if it were the equivalent of what has happened to household saving.

There is nothing wrong, in principle, with thinking in terms of the logic of Figure 1, or constructing models on that basis. Social science is impossible without abstraction. It’s often useful, even necessary, to think through the implications of a small subset of the relationships between economic variables, while ignoring the rest. But when we turn to  the concrete historical changes in macroeconomic quantities like household debt and aggregate demand in the US, the ceteris paribus condition is no longer available. We can’t reason in terms of the hypothetical case where all else was equal. We have to take into account all the factors that actually did contribute to those changes.

This is one of the main points of the debt-inequality paper, and of my work with Arjun Jayadev on household debt. In reality, much of the historical variation in debt-income ratios and related variables cannot be explained in terms of the factors in Figure 1. You need something more like Figure 2.

Figure 2 shows a broader set of factors that we need to include in a historical account of household sector balances. I should emphasize, again, that this is not about cause and effect. The links shown in the diagram are accounting relationships. You cannot explain the outcomes at the bottom without the factors shown here. [1] I realize it looks like a lot of detail. But this is not complexity for complexity’s sake. All the links shown in Figure 2 are quantitatively important.

The dark black links are the same as in the previous diagram. It is still true that higher household consumption spending reduces saving and raises aggregate demand, and contributes to lower saving and higher borrowing, which in turn contributes to lower net wealth and an increase in the debt ratio. Note, though, that I’ve separated saving from balance sheet improvement. The economic saving used in the national accounts is quite different from the financial saving that results in changes in the household balance sheet.

In addition to the factors the debt-demand story of Figure 1 focuses on, we also have to consider: various actual and imputed payment flows that the national accounts attribute to the household sector, but which do not involve any money payments to or fro households (blue); the asset side of household balance sheets (gray); factors other than current spending that contribute to changes in debt-income ratios (red); and change in value of existing assets (cyan).

The blue factors are discussed in Section 5 of the debt-distribution paper. There is a much fuller discussion in a superb paper by Barry Cynamon and Steve Fazzari, which should be read by anyone who uses macroeconomic data on household income and consumption. Saving, remember, is defined as the difference between income and consumption. But as Cynamon and Fazzari point out, on the order of a quarter of both household income and consumption spending in the national accounts is accounted for by items that involve no actual money income or payments for households, and thus cannot affect household balance sheets.

These transactions include, first, payments by third parties for services used by households, mainly employer-paid premiums for health insurance and payments to healthcare providers by Medicaid and Medicare. These payments are counted as both income and consumption spending for households, exactly as if Medicare were a cash transfer program that recipients then chose to use to purchase healthcare. If we are interested in changes in household balance sheets, we must exclude these payments, since they do not involve any actual outlays by households; but they still do contribute to aggregate demand. Second, there are imputed purchases where no money really changes hands at all.  The most important of these are owners’ equivalent rent that homeowners are imputed to pay to themselves, and the imputed financial services that households are supposed to purchase (paid for with imputed interest income) when they hold bank deposits and similar assets paying less than the market interest rate. Like the third party payments, these imputed interest payments are counted as both income and expenditure for households. Owners’ equivalent rent is also added to household income, but net of mortgage interest, property taxes and maintenance costs. Finally, the national accounts treat the assets of pension and similar trust funds as if they were directly owned by households. This means that employer contributions and asset income for these funds are counted as household income (and therefore add to measured saving) while benefit payments are not.

These items make up a substantial part of household payments as recorded in the national accounts – Medicare, Medicaid and employer-paid health premiums together account for 14 percent of official household consumption; owners’ equivalent rent accounts for another 10 percent; and imputed financial services for 4 percent; while consolidating pension funds with households adds about 2 percent to household income (down from 5 percent in the 1980s). More importantly, the relative size of these components has changed substantially in the past generation, enough to substantially change the picture of household consumption and income.

Incidentally, Klein says I exclude all healthcare spending in my adjusted consumption series. This is a misunderstanding on his part. I exclude only third-party health care spending — healthcare spending by employers and the federal government. I’m not surprised he missed this point, given how counterintuitive it is that Medicare is counted as household consumption spending in the first place.

This is all shown in Figure 3 below (an improved version of the paper’s Figure 1):

The two dotted lines remove public and employer payments for healthcare, respectively, from household consumption. As you can see, the bulk of the reported increase in household consumption as a share of GDP is accounted for by healthcare spending by units other than households. The gray line then removes owners’ equivalent rent. The final, heavy black line removes imputed financial services, pension income net of benefits payments, and a few other, much smaller imputed items. What we are left with is monetary expenditure for consumption by households. The trend here is essentially flat since 1980; it is simply not the case that household consumption spending has increased as a share of GDP.

So Figure 3 is showing the contributions of the blue factors in Figure 2. Note that while these do not involve any monetary outlay by households and thus cannot affect household balance sheets or debt, they do all contribute to measured household saving.

The gray factors involve household assets. No one denies, in principle, that balance sheets have both an asset side and a liability side; but it’s striking how much this is ignored in practice, with net and gross measures used interchangeably. In the first place, we have to take into account residential investment. Purchase of new housing is considered investment, and does not reduce measured saving; but it does of course involve monetary outlay and affects household balance sheets just as consumption spending does. [2] We also have take into account net acquisition of financial assets. An increase in spending relative to income moves household balance sheets toward deficit; this may be accommodated by increased borrowing, but it can just as well be accommodated by lower net purchases of financial assets. In some cases, higher desired accumulation of financial asset can also be an autonomous factor requiring balance sheet adjustment. (This is probably more important for other sectors, especially state and local governments, than for households.) The fact that adjustment can take place on the asset as well as the liability side is another reason there is no necessary connection between saving and debt growth.

Net accumulation of financial assets affects household borrowing, but not saving or aggregate demand. Residential investment also does not reduce measured saving, but it does increase aggregate demand as well as borrowing. The red line in Figure 3 adds residential investment by households to adjusted consumption spending. Now we can see that household spending on goods and services did indeed increase during the housing bubble period – conventional wisdom is right on that point. But this was a  spike of limited duration, not the secular increase that the standard consumption figures suggest.

Again, this is not just an issue in principle; historical variation in net acquisition of assets by the household sector is comparable to variation in borrowing. The decline in observed savings rates in the 1980s, in particular, was much more reflected in slower acquisition of assets than faster growth of debt. And the sharp fall in saving immediately prior to the great recession in part reflects the decline in residential investment, which peaked in 2005 and fell rapidly thereafter.

The cyan item is capital gains, the other factor, along with net accumulation, in growth of assets and net wealth. For the debt-demand story this is not important. But in other contexts it is. As I pointed out in my Crooked Timber post on Piketty, the growth in capital relative to GDP in the US is entirely explained by capital gains on existing assets, not by the accumulation dynamics described by his formula “r > g”.

Finally, the red items in Figure 2 are factors other than current spending and income that affect the debt-income ratio. Arjun Jayadev and I call this set of factors “Fisher dynamics,” after Irving Fisher’s discussion of them in his famous paper on the Great Depression. Interest payments reduce measured saving and shift balance sheets toward deficit, just like consumption; but they don’t contribute to aggregate demand. Defaults or charge-offs reduce the outstanding stock of debt, without affecting demand or measured savings. Like capital gains, they are a change in a stock without any corresponding flow. [3] Finally, the debt-income ratio has a denominator as well as a numerator; it can be raised just as well by slower nominal income growth as by higher borrowing.

These factors are the subject of two papers you can find here and here. The bottom line is that a large part of historical changes in debt ratios — including the entire long-term increase since 1980 — are the result of the items shown in red here.

So what’s the point of all this?

First, borrowing is not the opposite of saving. Not even roughly. Matthew Klein, like most people, immediately translates rising debt into declining saving. The first half of his post is all about that. But saving and debt are very different things. True, increased consumption spending does reduce saving and increase debt, all else equal. But saving also depends on third party spending and imputed spending and income that has no effect on household balance sheets. While debt growth depends, in addition to saving, on residential investment, net acquisition of financial assets, and the rate of chargeoffs; if we are talking about the debt-income ratio, as we usually are, then it also depends on nominal income growth. And these differences matter, historically. If you are interested in debt and household expenditure, you have to look at debt and expenditure. Not saving.

Second, when we do look at expenditure by households, there is no long-term increase in consumption. Consumption spending is flat since 1980. Housing investment – which does involve outlays by households and may require debt financing – does increase in the late 1990s and early 2000s, before falling back. Yes, this investment was associated with a big rise in borrowing, and yes, this borrowing did come significantly lower in the income distribution that borrowing in most periods. (Though still almost all in the upper half.) There was a debt-financed housing bubble. But we need to be careful to distinguish this episode from the longer-term rise in household debt, which has different roots.

 

[1] Think of it this way: If I ask why the return on an investment was 20 percent, there is no end to causal factors you can bring in, from favorable macroeconomic conditions to a sound business plan to your investing savvy or inside knowledge. But in accounting terms, the return is always explained by the income and the capital gains over the period. If you know both those components, you know the return; if you don’t, you don’t. The relationships in the figure are the second kind of explanation.

[2] Improvement of existing housing is also counted as investment, as are brokers’ commissions and other ownership transfer costs. This kind of spending will absorb some part of the flow of mortgage financing to the household sector — including the cash-out refinancing of the bubble period — but I haven’t seen an estimate of how much.

[3] There’s a strand of heterodox macro called “stock-flow consistent modeling.” Insofar as this simply means macroeconomics that takes aggregate accounting relationships seriously, I’m very much in favor of it. Social accounting matrices (SAMs) are an important and underused tool. But it’s important not to take the name too literally — economic reality is not stock-flow consistent!

 

Two Papers in Progress

There are two new papers on the articles page on this site. Both are work in progress – they haven’t been submitted anywhere yet.

 

[I’ve taken the debt-distribution paper down. It’s being revised.]

The Evolution of State-Local Balance Sheets in the US, 1953-2013

Slides

The first paper, which I presented in January in Chicago, is a critical assessment of the idea of a close link between income distribution and household debt. The idea is that rising debt is the result of rising inequality as lower-income households borrowed to maintain rising consumption standards in the face of stagnant incomes; this debt-financed consumption was critical to supporting aggregate demand in the period before 2008. This story is often associated with Ragnuram Rajan and Mian and Sufi but is also widely embraced on the left; it’s become almost conventional wisdom among Post Keynesian and Marxist economists. In my paper, I suggest some reasons for skepticism. First, there is not necessarily a close link between rising aggregate debt ratios and higher borrowing, and even less with higher consumption. Debt ratios depend on nominal income growth and interest payments as well as new borrowing, and debt mainly finances asset ownership, not current consumption. Second, aggregate consumption spending has not, contrary to common perceptions, risen as a share of GDP; it’s essentially flat since 1980. The apparent rise in the consumption share is entirely due to the combination of higher imputed noncash expenditure, such as owners’ equivalent rent; and third party health care spending (mostly Medicare). Both of these expenditure flows are  treated as household consumption in the national accounts. But neither involves cash outlays by households, so they cannot affect household balance sheets. Third, household debt is concentrated near the top of the income distribution, not the bottom. Debt-income ratios peak between the 85th and 90th percentiles, with very low ratios in the lower half of the distribution. Most household debt is owed by the top 20 percent by income. Finally, most studies of consumption inequality find that it has risen hand-in-hand with income inequality; it appears that stagnant incomes for most households have simply meant stagnant living standards. To the extent demand has been sustained by “excess” consumption, it was more likely by the top 5 percent.

The paper as written is too polemical. I need to make the tone more neutral, tentative, exploratory. But I think the points here are important and have not been sufficiently grappled with by almost anyone claiming a strong link between debt and distribution.

The second paper is on state and local debt – I’ve blogged a bit about it here in the past few months. The paper uses budget and balance sheet data from the census of governments to make two main points. First, rising state and local government debt does not imply state and local government budget deficits. higher debt does not imply higher deficits: Debt ratios can also rise either because nominal income growth slows, or because governments are accumulating assets more rapidly. For the state and local sector as a whole, both these latter factors explain more of the rise in debt ratios than does the fiscal balance. (For variation in debt ratios across state governments, nominal income growth is not important, but asset accumulation is.) Second, despite balanced budget requirements, state and local governments do show substantial variation in fiscal balances, with the sector as a whole showing deficits and surpluses up to almost one percent of GDP. But unlike the federal government, the state and local governments accommodate fiscal imbalances entirely by varying the pace of asset accumulation. Credit-market borrowing does not seem to play any role — either in the aggregate or in individual states — in bridging gaps between current expenditure and revenue.

I will try to blog some more about both these papers in the coming days. Needless to say, comments are very welcome.

Making Sense of Changes in State-Local Debt

In a previous post, I pointed out that state and local governments in the US have large asset positions — 33 percent of GDP in total, down from nearly 40 percent before the recession. This is close to double state and local debt, which totals 17 percent of GDP. Among other things, this means that a discussion of public balance sheets that looks only at debt is missing at least half the picture.

On the other hand, a bit over half of those assets are in pension funds. Some people would argue that it’s misleading to attribute those holdings to the sponsoring governments, or that if you do you should also include the present value of future pension benefits as a liability. I’m not sure; I think there are interesting questions here.

But there are also interesting questions that don’t depend on how you treat the existing stocks of pension assets and liabilities. Here are a couple. First, how how do changes in state credit-market debt break down between the current fiscal balance and other factors, including pension fund contributions? And second, how much of state and local fiscal imbalances are financed by borrowing, and how much by changes in the asset position?

Most economists faced with questions like these would answer them by running a regression. [1] But as I mentioned in the previous post, I don’t think a regression is the right tool for this job. (If you don’t care about the methods and just want to hear the results, you can skip the next several paragraphs, all the way down to “So what do we find?”)

Think about it: what is a regression doing? Basically, we have a variable a that we think is influenced by some others: b, c, d … Our observations of whatever social process we’re interested in consist of sets of values for a, b, c, d… , all of them different each time. A regression, fundamentally, is an imaginary experiment where we adjusted the value of just one of b, c, d… and observed how a changed as a result. That’s the meaning of the coefficients that are the main outputs of a regression, along with some measure of our confidence in them.

But in the case of state budgets we already know the coefficients! If you increase state spending by one dollar, holding all other variables constant, well then, you increase state debt by one dollar. If you increase revenue by one dollar, again holding everything else constant, you reduce debt by one dollar. Budgets are governed by accounting identities, which means we know all the coefficients — they are one or negative one as the case may be. What we are interested in is not the coefficients in a hypothetical “data generating process” that produces changes in state debt (or whatever). What we’re interested in is how much of the observed historical variation in the variable of interest is explained by the variation in each of the other variables. I’m always puzzled when I see people regressing the change in debt on expenditure and reporting a coefficient — what did they think they were going to find?

For the question we’re interested in, I think the right tool is a covariance matrix. (Covariance is the basic measure of the variation that is shared between two variables.) Here we are taking advantage of the fact that covariance is linear: cov(x, y + z) = cov(x, y) + cov(x, z). Variance, meanwhile, is just a variable’s covariance with itself. So if we know that a = b + c + d, then we know that the variance of a is equal to the sum of its covariances with each of the others. In other words, if y = Σ xn then:

(1) var(y) = Σ cov(y, xn)

So for example: If the budget balance is defined as revenue – spending, then the variance of some observed budget balances must be equal to the covariance of the balance with revenue, minus the covariance of the balance with spending.

This makes a covariance matrix an obvious tool to use when we want to allocate the observed variation in a variable among various known causes. But for whatever reason, economists turn to variance decompositions only in few specific contexts. It’s common, for instance, to see a variance decomposition of this kind used to distinguish between-group from within-group inequality in a discussion of income distribution. But the same approach can be used any time we have a set of variables linked by accounting identities (or other known relationships) and we want to assess their relative importance in explaining some concrete variation.

In the case of state and local budgets, we can start with the identity that sources of funds = uses of funds. (Of course this is true of any economic unit.) Breaking things up a bit more, we can write:

revenues + borrowing = expenditure + net acquisition of financial assets (NAFA).

Since we are interested in borrowing, we rearrange this to:

(2) net borrowing = expenditure – revenue + NAFA = fiscal balance – NAFA

But we are not simply interested in borrowing,w e are interested in the change in the debt-GDP ratio (or debt-GSP ratio, in the case of individual states.) And this has a denominator as well as a numerator. So we write:

(3) change in debt ratio = net borrowing – nominal growth rate

This is also an accounting identity, but not an exact one; it’s a linear approximation of the true relationship, which is nonlinear. But with annual debt and income growth rates in the single digits, the approximation is very close.

So we have:

(4) change in debt ratio = expenditure – revenue + NAFA – nominal growth rate * current debt ratio

It follows from equation (1) that  the variance of change in the debt ratio is equal to the sum of the covariances of the change with each of the right-side variables. In other words, if we are interested in understanding why debt-GDP ratios have risen in some years and fallen in others, it’s straightforward to decompose this variation into the contributions of variation in each of the other variables. There’s no reason to do a regression here. [2]

So what do we find?

Here’s the covariance matrix for combined state and local debt for 1955 to 2013.  “Growth contrib.” refers to the last term in Equation (4). To make reading the table easier, I’ve reversed the sign of the growth contribution, fiscal balance and revenue; that means that positive values in the table all refer to factors that increase the variance of debt-ratio growth and negative values are factors that reduce it. [3]

Debt Ratio Growth Growth Contrib. Fiscal Balance Revenue Expenditure NAFA & Trusts
Debt Ratio Growth 0.18
Growth Contrib. (-) 0.10 0.11
Fiscal Balance (-) 0.03 0.04 0.13
Revenue (-) 0.08 0.24 0.12 5.98
Expenditure 0.11 0.28 -0.01 5.86 5.87
NAFA & Trusts 0.06 -0.05 0.13 -0.01 -0.14 0.23

How do we read this? First of all, note the bolded terms along the main diagonal — those are the covariance of each variable with itself, that is, its variance.  It is a measure of how much individual observations of this variable differ from each other. The off-diagonal terms, then, show how much of this variation is shared between two variables. Again, we know that if one variable is the sum of several others, then its variance will be the sum of its covariances with each of the others.

So for example, total variance of debt ratio growth is 0.18. (That means that the debt ratio growth  in a given year is, on average, about 0.4 percentage points above or below the average growth rate for the full period.) The covariance of debt-ratio growth and (negative) growth contribution is 0.10. So a bit over half the debt-ratio variance is attributable to nominal GDP growth. In other words, if we are looking at why the debt-GDP ratio rises more in some years than in others, more of the variation is going to be explained by the denominator of the ratio than the numerator. Next, we see that the covariance of debt growth with the (negative) fiscal balance is 0.03. In other words, about one-sixth of the variation in annual debt ratio growth is explained by fiscal deficits or surpluses.

This is important, because most discussions of state and local debt implicitly assume that all change in the debt ratio is explained this way. But in fact, while the fiscal balance does play some role in changes in the debt ratio — the covariance is greater than zero — it’s a distinctly secondary role.  Finally, the last variable, “NAFA & Trusts,” explains about a third of variation in debt ratio growth. In other words, years when state and local government debt is rising more rapidly relative to GDP, are also years in which those governments are adding more rapidly to their holdings of financial assets. And this source of variation explains about twice as much of the historical pattern of debt ratio changes, as the fiscal balance does.

Since this is probably still a bit confusing, the next table presents the same information in a hopefully clearer way. Here see only the covariances with debt ratio growth — the first column of the previous table — and they are normalized by the variance of debt ratio growth. Again, I’ve flipped the sign of variables that reduce debt-ratio growth. So each value of the table shows the share of variation in the growth of state-local growth ratios that is explained by that component. There is also a second column, showing the same thing for state governments only.  

Component State + Local State Only
Nominal Growth (-) 0.52 0.30
Fiscal Balance (-) 0.17 0.31
Revenue (-) -0.41 0.07
Expenditure 0.58 0.24
… of which: Interest 0.06 0.03
Trust Contrib. and NAFA 0.33 0.37
… of which: Pensions 0.01 0.02

I’ve added a couple variables here — interest payments under expenditure and pension contributions under NAFA and Trusts. Note in particular the small value of the latter. Pension contributions are quite stable from year to year. (The standard deviation of state/local pension contributions as a percent of GDP is just 0.07, versus around 0.5 for nontrust NAFA.)  This says that even though most state and local assets are in pension funds, pension contributions contribute only a little to the variation in asset acquisition. Most of the year to year variability is in governments’ acquisition of assets on their own behalf. This is helpful: It means that if we are interested in understanding variation in the growth of debt over time, or the role of assets vs. liabilities in accommodating fiscal imbalances, we don’t need to worry too much about how to think about pension funds. (If we want to focus on the total increase in state debt, as opposed to the variation over time, then pensions are still very important.)

If we compare the overall state-local sector with state governments only, the picture is broadly similar, but there are some interesting differences. First of all, nominal growth rates are somewhat less important, and the fiscal balance more important, for state government debt ratio. This isn’t surprising. State governments have more flexibility than local ones to independently adjust their spending and revenue; and state debt ratios are lower, so the effect on the ratio from a given change in growth rates is proportionately smaller. For the same reason, the effect of interest rate changes on the debt ratio, while small in both cases, is even smaller for the lower-debt state governments. [4]

So now we have shown more rigorously what we suggested in the previous post: While the fiscal balance plays some role in explaining why state and local debt ratios rise at some times and fall at others, it is not the main factor. Nominal growth rates and asset acquisition both play larger roles.

Let’s turn to the next question: How do state and local government balance sheets adjust to fiscal imbalances? Again, this is just a re-presentation of the data in the first table, this time focusing on the third column/row. Again, we’re also doing the decomposition for states in isolation, and adding a couple more items — in this case, the taxes and intergovernmental assistance components of revenue, and the pension contribution component of NAFA. The values are normalized here by the variance of the fiscal balance. The first four lines sum to 1, as do the last three. In effect, the first four rows of the table tells us where fiscal imbalances come from; the final three tell us where they go.


Component State + Local State Only
Revenue, of which: 0.94 1.01
… Taxes 0.50 0.93
… Intergovernmental 0.18 -0.04
Expenditure (-) 0.06 -0.01
Trust Contrib. and NAFA, of which: 1.04 0.92
… Pensions 0.10 -0.49
Borrowing (-) -0.04 0.08

So what do we see? Looking at the first set of lines, we see that state-local fiscal imbalances are entirely expenditure-driven. Surprisingly, revenues are no lower in deficit years than in surplus ones. Note that this is true of total revenues, but not of taxes. Deficit years are indeed associated with lower tax revenue and surplus years with higher taxes, as we would expect. (That’s what the positive values in the “taxes” row mean.) But this is fully offset by the opposite variation in payments from the federal government, which are lower in surplus years and higher in deficit years. During the most recent recession, for example, aggregate state and local taxes declined by about 0.4 percent of GDP. But federal assistance to state and local governments increased by 0.9 percent of GDP. This was unexpected to me: I had expected most of the variation in state budget balances to come from the revenue side. But evidently it doesn’t. The covariance matrix is confirming, and quantifying, what you can see in the figure below: Deficit years for the state-local sector are associated with peaks in spending, not troughs in revenue.

muni-budgets
Aggregate State-Local Revenue and Expenditure, 1953-2013

Turning to the question of how imbalances are accommodated, we find a similarly one-sided story. None of the changes in state-local budget balances result in changes in borrowing; all of them go to changes in fund contributions and direct asset purchases. [5] For the sector as a whole, in fact, asset purchases absorb more than all the variation in fiscal imbalances; borrowing is lower in deficit years than in surplus years. (For state governments, borrowing does absorb about ten percent of variation in the fiscal balance.) Note that very little of this is accounted for by pensions — less than none in the case of state governments, which see lower overall asset accumulation but higher pension fund contributions in deficit years. Again, even though pension funds account for most state-local assets, they account for very little of the year to year variation in asset purchases.

So the data tells a very clear story: Variation in state-local budget balances is driven entirely by the expenditure side; cyclical changes in their own revenue are entirely offset by changes in federal aid. And state budget imbalances are accommodated entirely by changes in the rate at which governments buy or sell assets. Over the postwar period, the state-local government sector has not used borrowing to smooth over imbalances between revenue and spending.

 

[1] The interesting historical meta-question, to which I have no idea of the answer, when and why regression analysis came to so completely dominate empirical work in economics. I suspect there are some deep reasons why economists are more attracted to methodologies that treat observed data as a sample or “draw” from a universal set of rules, rather than methodologies that focus on the observed data as the object of inquiry in itself.

[2] I confess I only realized recently that variance decompositions can be used this way. In retrospect, we should have done this in our papers in household debt.

[3] Revenue and expenditure here include everything except trust fund income and payments. In other words, unlike in the previous post, I am following the standard practice of treating state and local budgets separate from pension funds and other trust funds. The last line, “NAFA and Trusts”, includes both contributions to trust funds and acquisition of financial assets by the local government itself. But income generated by trust fund assets, and employee contributions to pension funds, are not included in revenue, and benefits paid are not included in expenditure. So the “fiscal balance” term here is basically the same as that reported by the NIPAs and other standard sources.

[4] This is different from households and the federal government, where higher debt and, in the case of households, more variable interest rates, mean that interest rates are of first-order importance in explaining the evolution of debt ratios over time.

[5] It might seem contradictory to say that a third of the variation in changes in the debt ratio is due to the fiscal balance, even though none of the variation in the fiscal balance is passed through to changes in borrowing. The reason this is possible is that those periods when there are both deficits and higher borrowing, also are periods of slower nominal income growth. This implies additional variance in debt growth, which is attributed to both growth and the fiscal balance. There’s some helpful discussion here.

 

(This post is based on a paper in process. I probably will not post any more material from this project for the next month or so, since I need to return to the question of potential output.)

 

New Article in the Review of Keynesian Economics

My paper with Arjun Jayadev, “The Post-1980 Debt Disinflation: An Exercise in Historical Accounting,” has now been published in the Review of Keynesian Economics. (There is some other stuff that looks interesting in there as well, but unfortunately most of the content is paywalled, a choice I’ve complained to the editors about.) I’ve posted the full article on the articles page on this site.

Here’s the abstract:

The conventional division of household payment flows between consumption and saving is not suitable for investigating either the causes of changing household debt–income ratios, or the interaction of household debt with aggregate demand. To explain changes in household debt, it is necessary to use an accounting framework that isolates net credit-market flows to the household sector, and that takes account of changes in the debt–income ratio resulting from nominal income growth as well as from new borrowing. To understand the implications of changing household income and expenditure flows for aggregate demand, it is necessary to distinguish expenditures that contribute to demand from expenditures that do not. Applying a conceptually appropriate accounting framework to the historical data reveals that the rise in household leverage over the past 3 decades cannot be understood in terms of increased household borrowing. For both the decade of the 1980s and the full post-1980 period, rising household debt–income ratios are entirely explained by the rise in nominal interest rates relative to nominal income growth. The rise in household debt after 1980 is best thought of as a debt disinflation, analogous to the debt deflation of the 1930s.

You can read the rest here.

Are US Households Done Deleveraging?

This Tuesday, I’ll be  at Joseph Stiglitz’s event at Columbia University on finance and inequality, presenting my work with Arjun Jayadev on household debt. You can find the latest version of our paper here.

In preparation, I’ve been updating the numbers and the results are interesting. As folks at the Fed have noted, the post-2007 period of household deleveraging seems to have reached its end. Here’s what the household debt picture looks like, in the accounting framework that Arjun and I prefer.

The units are percent of adjusted household income. (We can ignore the adjustments here.) The heavy black line shows the year-over-year change in household debt-income ratios. The bars then disaggregate that change into new borrowing by households — the primary deficit — and the respective contributions of interest payments, inflation, income growth, and defaults. A negative bar indicates a factor that reduces leverage; in most years, this includes both (real) income and inflation, since by raising the denominator they reduce the debt-income ratio. A positive bar indicates a factor that increases leverage; this includes interest payments (which are always positive), and the primary deficit in years in which households are on net receiving funds from credit markets.

Here’s what we are seeing:

In 2006 and 2007, debt-income ratios rose by about 3 percent each year; this is well below the six-point annual increases earlier in the 2000s, but still substantial. In 2008, the first year of the recession, the household debt-income ratio rises by another 3 points, despite the fact that households are now paying down debt, with repayments exceeding new borrowing by nearly 8 percent of household income. This is an astonishing rate of net repayment, the greatest since at least 1931. But despite this desperate effort to deleveraging, household debt-income ratios actually rose in 2008, thanks to the sharp fall in income and to near-zero inflation — in most years, the rise in prices automatically erodes the debt-income ratio. The combination of negative net borrowing and a rising debt burden is eerily reminiscent of the early Depression — it’s a clear sign of how, absent Big Government, the US at the start of the last recession was on track for a reprise of the Depression.

Interest payments make a stable positive contribution to the debt-incoem ratio throughout this period. Debt-service payments do fall somewhat, from around 7 percent of household income in 2006 to around 5 percent in 2013. But compared with other variables important to debt dynamics, debt-service payments are quite stable in the short-term. (Over longer periods, changes in effective interest rates are a ] bigger deal.) It’s worth noting in particular that the dramatic reduction in the federal funds rate in 2007-2008 had a negligible effect on the average interest rate paid by households.

In 2009-2012, the household debt-income ratio does fall, by around 5 points per year. But note that household surpluses (i.e. negative deficits) are no larger in these years than in 2008; the difference is that we see resumed positive growth of inflation and, a bit later, real incomes, raising the denominator of the debt-income ratio. This is what failed to happen in the 1930s. Equally important, there is a sharp rise in the share of debt written off by default, exceeding 3 percent in each year, compared with a writeoff rate below one percent in all pre-recession years. Note that the checked bar and the white bar are of similar magnitudes: In other words, repayment and default contributed about equally to the reduction of household debt. If deleveraging was an important requirement for renewed economic growth then it’s a good thing that it’s still possible to discharge our debts through bankruptcy. Otherwise, there would have been essentially no reduction in debt-income ratios between 2007 and 2012. [*]

This much is in the paper. But in 2013 the story changes a bit. The household debt-income ratio rises again, for the first time since 2008. And the household balance movers into deficit, for the first time since 2007 — for the first time in six years, households are receiving more funds from the credit markets than they are paying back to them. These events are linked. While the central point of our paper is that changes in leverage cannot be reduced to changes in borrowing, for the US households in 2013, it is in fact increased borrowing that drove the rise in debt-income ratios. Inflation and income growth were basically constant between 2012 and 2013. The 5-point acceleration in the growth of the household debt-income ratio is explained by a 4.5 point rise in new borrowing by households (plus a 1.5 point fall in defaults, offset by a 1-point acceleration in real income growth).

So what do we make of this? Well, first, boringly perhaps but importantly, it’s important to acknowledge that sometimes the familiar story is the correct story. If households owe more today than a year ago, it’s because they borrowed more over the past year. It’s profoundly misleading to suppose this is always the case. But in this case it is the case. Secondly, I think this vindicates the conclusion of our paper, that sustained deleveraging is impossible in the absence of substantially higher inflation, higher defaults, or lower interest rates. These are not likely to be seen without deliberate, imaginative policy to increase inflation, directly reduce the interest rates facing households, and/or write off much more of household debt than will happen through the existing bankruptcy process. Otherwise, in today’s low-inflation environment, as soon as the acute crisis period ends leverage is likely to resume its rise. Which seems to be what we are seeing.

[*] More precisely: By our calculations, defaults reduced the aggregate household debt-income ratio by 20 points over 2008-2012, out of a total reduction of 21.5 points.

The Nonexistent Rise in Household Consumption

Did you know that about 10 percent of private consumption in the US consists of Medicare and Medicaid? Despite the fact that these are payments by the government to health care providers, they are counted by the BEA both as income and consumption spending for households.

I bet you didn’t know that. I bet plenty of people who work with the national income accounts for a living don’t know that. I know I didn’t know it, until I read this new working paper by Barry Cynamon and Steve Fazzari.

I’ve often thought that the best macroeconomics is just accounting plus history. This paper is an accounting tour de force. What they’ve done is go through the national accounts and separate out the components of household income and expenditure that represent cashflows received and made by households, from everything else.

Most people don’t realize how much of what goes into the headline measures of household income and household consumption does not actually correspond to any flow of money to or from households. In 2011 (the last year covered by the paper), personal consumption expenditure was given as just over $10 trillion. But of that, only about $7.5 trillion was money spent by households on goods and services. Of the rest, as of 2011:

– $1.2 trillion was imputed rents on owner-occupied housing. The national income and product accounts treat housing on the principle that the real output of housing should be the same whether or not the person living in the house happens to be the same person who owns it. So for owner-occupied housing, they impute an “owner equivalent rent” that the resident is implicitly paying to themselves for use of the house.  This sounds reasonable, but it conflicts with another principle of the national accounts, which is that only market transactions are recorded. It also creates measurement problems since most owned residences are single-family homes, for which there isn’t a big rental market, so the BEA has to resort to various procedures to estimate what the rent should be. One result of the procedures they use is that a rise in hoe prices, as in the 2000s, shows up as a rise in consumption spending on imputed rents even if no additional dollars change hands.

– $970 billion was Medicare and Medicaid payments; another $600 billion was employer purchases of group health insurance. The official measures of household consumption are constructed as if all spending on health benefits took the form of cash payments, which they then chose to spend on health care. This isn’t entirely crazy as applied to employer health benefits, since presumably workers do have some say in how much of their compensation takes the form of cash vs. health benefits; tho one wouldn’t want to push that assumption that too far. But it’s harder to justify for public health benefits. And, justifiable or not, it means the common habit of referring to personal consumption expenditure as “private” consumption needs a large asterix.

– $250 billion was imputed bank services. The BEA assumes that people accept below-market interest on bank deposits only as a way of purchasing some equivalent service in return. So the difference between interest from bank deposits and what it would be given some benchmark rate is counted as consumption of banking services.

– $400 billion in consumption by nonprofits. Nonprofits are grouped with the household sector in the national accounts. This is not necessarily unreasonable, but it creates confusion when people assume the household sector refers only to what we normally think of households, or when people try to match up the aggregate data with surveys or other individual-level data.

Take these items, plus a bunch of smaller ones, and you have over one-quarter of reported household consumption that does not correspond to what we normally think of as consumption: market purchases of goods and services to be used by the buyer.

The adjustments are even more interesting when you look at trends over time. Medicare and Medicaid don’t just represent close to 10 percent of reported “private” consumption; they represent over three quarters of the increase in consumption over the past 50 years. More broadly, if we limit “consumption” to purchases by households, the long term rise in household consumption — taken for granted by nearly everyone, heterodox or mainstream — disappears.

By the official measure, personal consumption has risen from around 60 percent of GDP in the 1950s, 60s and 70s, to close to 70 percent today. While there are great differences in stories about why this increase has taken place, almost everyone takes for granted that it has. But if you look at Cynamon and Fazzari’s measure, which reflects only market purchases by households themselves, there is no such trend. Consumption declines steadily from 55 percent of GDP in 1950 to around 47 percent today. In the earlier part of this period, impute rents for owner occupied housing are by far the biggest part of the difference; but in more recent years third-party medical expenditures have become more important. Just removing public health care spending from household consumption, as shown in the pal red line in the figure, is enough to change a 9 point rise in the consumption share of GDP into a 2 point rise. In other words, around 80 percent of the long-term rise in household consumption actually consists of public spending on health care.

In our “Fisher dynamics” paper, Arjun Jayadev and I showed that the rise in debt-income ratios for the household sector is not due to any increase in household borrowing, but can be entirely explained by higher interest rates relative to income growth and inflation. For that paper, we wanted to adjust reported income in the way that Fazzari and Cynamon do here, but we didn’t make a serious effort at it. Now with their data, we can see that not only does the rise in household debt have nothing to do with any household decisions, neither does the rise in consumption. What’s actually happened over recent decades is that household consumption as a share of income has remained roughly constant. Meanwhile, on the one hand disinflation and high interest rates have increased debt-income ratios, and on the other hand increased public health care spending and, in the 2000s high home prices, have increased reported household consumption. But these two trends have nothing to do with each other, or with any choices made by households.

There’s a common trope in left and heterodox circles that macroeconomic developments in recent decades have been shaped by “financialization.” In particular, it’s often argued that the development of new financial markets and instruments for consumer credit has allowed households to choose higher levels of consumption relative to income than they otherwise would. This is not true. Rising debt over the past 30 years is entirely a matter of disinflation and higher interest rates; there has been no long run increase in borrowing. Meanwhile, rising consumption really consists of increased non-market activity — direct provision of housing services through owner-occupied housing, and public provision of health services. This is if anything a kind of anti-financialization.

The Fazzari and Cynamon paper has radical implications, despite its moderate tone. It’s the best kind of macroeconomics. No models. No econometrics. Just read the damn tables, and think about what the numbers mean.

Borrowing ≠ Debt

There’s a common shorthand that makes “debt” and “borrowing” interchangeable. The question of why an economic unit had rising debt over some period, is treated as equivalent to the question of why it was borrowing more over that period, or why its expenditure was higher relative to its income. This is a natural way of talking, but it isn’t really correct.

The point of Arjun’s and my paper on debt dynamics was to show that for household debt, borrowing and changes in debt don’t line up well at all. While some periods of rising household leverage — like the housing bubble of the 2000s — were also periods of high household borrowing, only a small part of longer-term changes in household debt can be explained this way. This is because interest, income growth and inflation rates also affect debt-income ratios, and movements in these other variables often swamp any change in household borrowing.
As far as I know, we were the first people to make this argument in a systematic way for household debt. For government debt, it’s a bit better known — but only a bit. People like Willem Buiter or Jamie Galbraith do point out that the fall in US debt after World War II had much more to do with growth and inflation than with large primary surpluses. You can find the argument more fully developed for the US in papers by Hall and Sargent  or Aizenman and Marion, and for a large sample of countries by Abbas et al., which I’ve discussed here before. But while many of the people making it are hardly marginal, the point that government borrowing and government debt are not equivalent, or even always closely linked, hasn’t really made it into the larger conversation. It’s still common to find even very smart people saying things like this:

We didn’t have anything you could call a deficit problem until 1980. We then saw rising debt under Reagan-Bush; falling debt under Clinton; rising under Bush II; and a sharp rise in the aftermath of the financial crisis. This is not a bipartisan problem of runaway deficits! 

Note how the terms “deficits” and “rising debt” are used interchangeably; and though the text mostly says deficits, the chart next to this passage shows the ratio of debt to GDP.
What we have here is a kind of morality tale where responsible policy — keeping government spending in line with revenues — is rewarded with falling debt; while irresponsible policy — deficits! — gets its just desserts in the form of rising debt ratios. It’s a seductive story, in part because it does have an element of truth. But it’s mostly false, and misleading. More precisely, it’s about one quarter true and three quarters false.
Here’s the same graph of federal debt since World War II, showing the annual change in debt ratio (red bars) and the primary deficit (black bars), both measured as a fraction of GDP. (The primary deficit is the difference between spending other than interest payments and revenue; it’s the standard measure of the difference between current expenditure and current revenue.) So what do we see?
It is true that the federal government mostly ran primary surpluses from the end of the war until 1980, and more generally, that periods of surpluses were mostly periods of rising debt, and conversely. So it might seem that using “deficits” and “rising debt” interchangeably, while not strictly correct, doesn’t distort the picture in any major way. But it does! Look more carefully at the 1970s and 1980s — the black bars look very similar, don’t they? In fact, deficits under Reagan were hardy larger than under Ford and Carter —  a cumulative 6.2 percent of GDP over 1982-1986, compared with 5.6 percent of GDP over 1975-1978. Yet the debt-GDP ratio rose by just a single point (from 24 to 25) in the first episode, but by 8 points (from 32 to 40) in the second. Why did debt increase in the 1980s but not in the 1970s? Because in the 1980s the interest rate on federal debt was well above the economy’s growth rate, while in the 1970s, it was well below it. In that precise sense, if debt is a problem it very much is a bipartisan one; Volcker was the appointee of both Carter and Reagan.
Here’s the same data by decades, and for the pre- and post-1980 periods and some politically salient subperiods.  The third column shows the part of debt changes not explained by the primary balance. This corresponds to what Arjun and I call “Fisher dynamics” — the contribution of growth, inflation and interest rates to changes in leverage. [*] The units are percent of GDP.
Totals by Decade
Primary Deficit Change in Debt Residual Debt Change
1950s -8.6 -29.6 -20.9
1960s -7.3 -17.7 -10.4
1970s 2.8 -1.7 -4.6
1980s 3.3 16.0 12.7
1990s -15.9 -7.3 8.6
2000s 23.7 27.9 4.2
Annual averages
Primary Deficit Change in Debt Residual Debt Change
1947-1980 -0.7 -2.0 -1.2
1981-2011 0.1 1.3 1.2
   1981-1992 0.3 1.8 1.5
   1993-2000 -2.7 -1.6 1.1
   2001-2008 -0.1 0.8 0.9
   2009-2011 7.3 8.9 1.6

Here again, we see that while the growth of debt looks very different between the 1970s and 1980s, the behavior of deficits does not. Despite Reagan’s tax cuts and military buildup, the overall relationship between government revenues and expenditures was essentially the same in the two decades. Practically all of the acceleration in debt growth in the 1980s compared with the 1970s is due to higher interest rates and lower inflation.

Over the longer run, it is true that there is a shift from primary surpluses before 1980 to primary deficits afterward. (This is different from our finding for households, where borrowing actually fell after 1980.) But the change in fiscal balances is less than 25 percent the change in debt growth. In other words, the shift toward deficit spending, while real, only accounts for a quarter of the change in the trajectory of the federal debt. This is why I said above that the morality-tale version of the rising debt story is a quarter right and three quarters wrong.

By the way, this is strikingly consistent with the results of the big IMF study on the evolution of government debt ratios around the world. Looking at 60 episodes of large increases in debt-GDP ratios over the 20th century, they find that only about a third of the average increase is accounted for by primary deficits. [2] For episodes of falling debt, the role of primary surpluses is somewhat larger, especially in Europe, but if we focus on the postwar decades specifically then, again, primary surpluses accounted for only a about a third of the average fall. So while the link between government debt and deficits has been a bit weaker in the US than elsewhere, it’s quite weak in general.

So. Why should we care?

Most obviously, you should care if you’re worried about government debt. Now maybe you shouldn’t worry. But if you do think debt is a problem, then you are looking in the wrong place if you think holding down government borrowing is the solution. What matters is holding down i – (g + π) — that is, keeping interest rates low relative to growth and inflation. And while higher growth may not be within reach of policy, higher inflation and lower interest rates certainly are.

Even if you insist on worrying not just about government debt but about government borrowing, it’s important to note that the cumulative deficits of 2009-2011, at 22 percent of GDP, were exactly equal to the cumulative surpluses over the Clinton years, and only slightly smaller than the cumulative primary surpluses over the whole period 1947-1979. So if for whatever reason you want to keep borrowing down, policies to avoid deep recessions are more important than policies to control spending and raise revenue.

More broadly, I keep harping on this because I think the assumption that the path of government debt is the result of government borrowing choices, is symptomatic of a larger failure to think clearly about this stuff. Most practically, the idea that the long-run “sustainability” of the  debt requires efforts to control government borrowing — an idea which goes unquestioned even at the far liberal-Keynesian end of the policy spectrum —  is a serious fetter on proposals for more stimulus in the short run, and is a convenient justification for all sorts of appalling ideas. And in general, I just reject the whole idea of responsibility. It’s ideology in the strict sense — treating the conditions of existence of the dominant class as if they were natural law. Keynes was right to see this tendency to view of all of life through a financial lens — to see saving and accumulating as the highest goals in life, to think we should forego real goods to improve our financial position — as “one of those semicriminal, semi-pathological propensities which one hands over with a shudder to the specialists in mental disease.”

On a methodological level, I see reframing the question of the evolution of debt in terms of the independent contributions of primary deficits, growth, inflation and interest rates as part of a larger effort to think about the economy in historical, dynamic terms, rather than in terms of equilibrium. But we’ll save that thought for another time.

The important point is that, historically, changes in government borrowing have not been the main factor in the evolution of debt-GDP ratios. Acknowledging that fact should be the price of admission to any serious discussion of fiscal policy.

[1] Strictly speaking, debt ratios can change for reasons other than either the primary balance or Fisher dynamics, such as defaults or the effects of exchange rate movements on foreign-currency-denominated debt. But none of these apply to the postwar US.

[2] The picture is a bit different from the US, since adverse exchange-rate movements are quite important in many of these episodes. But it remains true that high deficits are the main factor in only a minority of large increases in debt-GDP ratios.