At Substack: The End of Laissez Faire

(I wrote this post about two weeks ago, but then took a while getting the Substack actually launched. Going forward, hopefully the content will be more timely. All substack content is free; you can subscribe to the newsletter version here. Hopefully the content will be more timely in the future!)

Sometimes I think being a normal economist must be like one of those classic office jobs. You drive to work, park in the garage, take the elevator up to your office. You take some papers from your inbox and put them in your outbox. There’s the research frontier; ok, we’ve advanced it a little bit. Then the bell rings, quitting time. Whereas here in the heterodox world, it’s like you’ve let yourself in through a gap in the fence and you’re wondering, is this place a construction site, or is something being demolished, or is it an archaeological dig? I think this is my desk, but it could be some weird art object, or possibly part of the ventilation system. This person in the hallway — are they the boss, or a customer, or maybe someone in need of emergency medical assistance? Am I sure I have a job? Am I even supposed to be in here?

Well then. Back to work!

The question of the moment is industrial policy. Not so long ago, the consensus on climate policy, at the high table at least, was that carbon pricing was it. Government provides the public interest with an abstract monetary representation, and then private businesses (or “markets”) will translate that representation into whatever concrete changes to production are called for. In recent years, though, the debate seems to have been shifting rather rapidly towards what I have called an investment-focused approach. The passage of the Inflation Reduction Act (along with other similar measures) seems to mark a decisive turn toward industrial policy, in the US at least. This is not only about climate — the disruptions to global supply chains during the pandemic and, more worryingly, a renewed sense of rivalry with China, have strengthened the case for support for key sectors of the economy.

(Full disclosure: When someone mentioned to me early in the Biden administration that there was interest in dealing with the chip shortage by fostering a US industry, I thought it was a silly idea that would go nowhere. This was, it seemed to me, about the worst case for policy — a problem that was at once both extraordinarily hard for government to solve, and likely to take care of itself on its own before long. Shows you how much I know! — or perhaps, how much things have changed.)

The case for industrial policy, obviously, involves a reevaluation of the capacity of government and the problems it is expected to solve — what Keynes, in an essay whose title can be repurposed today, called the line between agenda and non-agenda. But it also, a bit less obviously, involves a shift in how we think about the economy. An economy where industrial policy makes sense is not one that can be usefully described in terms of a unique, stable equilibrium toward which decentralized decisionmakers will converge. Industrial policy only makes sense in a world where increasing returns and learning by doing create significant path dependence — what we are good at today depends on what we were doing yesterday — and where an uncertain future and the need for large, irreversible investments, and the prevalence of complementarity rather than substitution, creates coordination problems that markets are unable to solve. I don’t know that the drafters of the IRA were conscious of it, but they were implicitly endorsing a very different model of the economy than the one that one finds in textbooks.

Supply constraints. My big recent publication, coauthored as usual with Arjun Jayadev, is an article in the Review of Keynesian Economics called “Rethinking Supply Constraints.” It addresses exactly this issue. The one-sentence summary is that it makes more sense to think of the productive capacity of the economy in terms of a speed limit — a limit on the rate at which output and employment can grow — rather than an absolute ceiling, as in conventional measures of potential output. This, we argue, fits better with a wide range of empirical phenomena. Equally important, it fits better with a vision of the economy as an open-ended collective transformation of the world, as opposed to the allocation of an existing basket of stuff.

There’s a summary in this blogpost, and video of my presentation of it at the University of Massachusetts is here. (I start around 47 minutes in.)  I will try to write more about it in this newsletter soon.

Low rates and bubbles. My latest Barron’s piece (I write one more or less monthly) was on whether the post-2007 decade of low interest rates can be blamed for Sam Bankman-Fried and financial bubbles and frauds more generally. As always, when the headline is a question, the answer is no.

I don’t think I quite stuck the landing with this one. The big point I should have hammered on is that if abundant credit ends up supporting projects that are socially and privately worthless, that’s a problem. But it is a problem with the institutions whose job it is to allocate credit, not with low interest rates or abundant credit as such. If banks and bank-like institutions can borrow at lower rates, it’s easy to see why they’d lend to projects with lower returns. It’s harder to see why they’d lend to projects with negative returns. The idea, evidently, is that for some reason when interest rates are too low financial-market participants will make choices that are not only socially costly but costly to themselves as well. The low rates-cause-bubbles arguments almost amount to a kind of financial terrorism — give us the risk-free returns we were counting on, or we’ll blow up our portfolios, and some chunk of the economy along with it.

The connection to industrial policy? If we don’t trust financial markets to make investment decisions, that strengthens the case for a bigger public role.

Biden, Brenner, and Benanav. Robert Brenner’s frequent collaborator Dylan Riley wrote a piece in the NLR blog Sidecar, drawing on Brenner’s work to argue that industrial policy  is hopeless because of global overcapacity; you’ve got to seize the commanding heights or stay home. I don’t agree. I think there are ways that the socialist project can be advanced via Biden administration initiatives like the IRA, and wrote a piece for Jacobin explaining why.

Some people liked it — Adam Tooze gave it a nice mention in one of his newsletters. Others did not. Aaron Benanav wrote a long and rather irritated rebuttal in New Left Review. I disagree with a lot of what he wrote, which is fine; he, as he made very clear, disagreed with what I wrote. As the protagonist of James Salter’s great Korean War novel The Hunters says, “You shoot at them, they shoot at you. What could be fairer?” But I am a little annoyed that my jaunty Hamilton reference, intended to warn against the danger of imagining that you are in a position of power, got turned into evidence that I myself dream of being in the “room where it happens.” That seems unsporting.

I talked about my piece and the larger debate with Doug Henwood on his excellent Behind the News podcast. I will also be writing a piece for NLR that will be in part a response to Benanav but mostly, I hope, an intervention to move the debate in a more positive direction.

Speaking of Korea. I was on an English-language Korean news show recently, talking about the IRA. The video is here; a twitter thread summarized the points I was trying to make is here. An implicit background point, also very relevant to my objections to the Brenner-Riley-Benanav position, is that trade flows respond mostly to income, not relative prices. How much the US imports from Korea is to a first approximation a function of US GDP growth; subsidies (and exchange rates) are distinctly secondary.

What I am reading. I just finished the novel Variations on Night and Day, by Abdelrahman Munif. It’s the third novel in the Cities of Salt trilogy, though the first chronologically. The first novel, also called Cities of Salt, is about people in a fictional Middle Eastern Country (more or less Saudi Arabia) in the early days of the oil boom. It’s an extraordinary book in many ways, including its use of mostly collective protagonists — large parts of the narration are from the point of view of “the villagers”, “the workers” and so on. The second book, The Trench, moves up the social scale, focusing on the various schemers, strivers, climbers and entrepreneurs – business and political – who accrete around the monarchy’s capital. It’s got an ensemble, rather than collective cast, with one central character and an endless number of minor ones – it would make a great tv show. (Think a gulf-monarchy version of Hillary Mantel’s Cromwell novels.) The third book — Variations on Night and Day — moves up the social scale again, and back in time, to the earlier life of the sultan whose death occurs at the very beginning of The Trench. It’s a great book, gripping as narrative and morally serious. It provides what science fiction and fantasy promise but very seldom deliver, an immersive experience of a world very different from our own. Still I have to say, I somewhat preferred the first two books. At the end of the day, sultans are just not that interesting.

ETA: As it happens, I went to graduate school with Munif’s son Yasser. He was in the sociology department while I was in economics and we used to hang out quite a bit, tho I haven’t seen him in some years.

At Jacobin: Yes, We Should Support Industrial Policy and the Green New Deal

(This piece was published by Jacobin on April 6, 2023, in response to the Dylan Riley post linked in the first paragraph. The version below adds a few unimportant footnotes and one somewhat important paragraph that I forgot to write before submitting it — the one about halfway through that mentions Oskar Lange.)

A few days ago, Dylan Riley wrote a post on New Left Review’s Sidecar blog that provoked a furious response on twitter. 1 Since I largely agree with the criticism made by Alex Williams, Nathan Tankus, Doug Henwood and others, perhaps I shouldn’t add to the chorus. But I want to try to clarify the larger stakes in this debate.

Riley’s piece starts from the suggestion that the failure of Silicon Valley Bank reflects a larger crisis of overcapacity and lack of investment opportunities. SVB, he writes,

had parked a huge quantity of its deposits in low-yield – but supposedly safe – government-backed securities and low-interest bonds. … the bank was overwhelmed by the massive growth in deposits from its tech clients – and neither it nor they could find anything worthwhile to invest in. …the SVB collapse is a beautiful, almost paradigmatic, demonstration of the fundamental structural problem of contemporary capitalism: a hyper-competitive system, clogged with excess capacity and savings, with no obvious outlets to soak them up.

This is an elegant framing but it runs into a problem immediately, involving the ambivalent meaning of ‘invest.” The depositors in SVB were not venture capitalists, but the firms that they had stakes in. The reason SVB had such big deposits was not because finance was unable to find profitable outlets even in the tech world, but precisely because it had done so. (Whether these businesses are doing anything socially useful is of course a different question.) The fact that SVB’s assets consisted of Treasury bonds rather than loans to its depositors reflects the shift in business financing, especially in tech, away from banks toward specialized venture capital funds — an interesting development, certainly, but one that doesn’t tell us anything about the overall population of businesses looking for financing.

Lurking behind Riley’s formulation here seems to be a crude version of commodity money theory, in which money is either out in the world being useful, or being left idle in the bank. But money in the real world is always in the form of bank deposits — that’s what money is — regardless of how actively it is circulating.

To be fair, Silicon Valley Bank is just the hook here. The real argument of the post — the one that provoked such a reaction — is that the ongoing crisis of overcapacity means that Green New Deal-type programs of public investment in decarbonization are a self-defeating dead end.   “Imagine,” writes Riley,

that Bidenomics in its most ambitious form were successful. What exactly would this mean? Above all it would lead to the onshoring of industrial capacity in both chip manufacturing and green tech. But that process would unfold in a global context in which all the other capitalist powers were vigorously attempting to do more or less the same thing. The consequence of this simultaneous industrialization drive would be a massive exacerbation of the problems of overcapacity on a world scale, putting sharp pressure on the returns of the same private capital that was ‘crowded-in’ by ‘market-making’ industrialization policies.

There are a number of distinct arguments in, or at least in the vicinity of, Riley’s post. We can of course debate the specific content of the IRA — where does it fall on Daniela Gabor’s spectrum from “de-risking” to the “big green state”? There’s a larger political question about the extent to which activists and intellectuals on the left should attach themselves to programs carried out by the established political actors through the state, as opposed to popular movements outside of it. And then there is the specific question of overcapacity — is it reasonable to think that any boost to investment via public spending will just diminish opportunities for profitable accumulation elsewhere?

I’m not unsympathetic to the first two of these arguments, even if I don’t agree with them in this particular case.

In my opinion, the IRA model passes two key tests: The public money goes to productive enterprises, not to holders of financial assets; and there is affirmative direction of spending toward specific activities. To me there is an important difference between “for each new solar panel you install with union labor, you will get x dollars of subsidies” and “if you hold a bond that fits these broad criteria, the interest is taxed at a lower rate” — even though, at a sufficiently high level of abstraction, both involve subsidizing private capital. But there’s a lot of room for debate here about how to describe specific measures and where to draw the line; a different read of its provisions might plausibly put the IRA on the other side of it.

Similarly, it’s important to remember that winning some specific legislation does not mean that you control the state — there’s a real danger in imagining ourselves “in the room where it happens” when in reality we are very far from it. When Riley writes that “no socialist should advocate an ‘industrial policy’ of any sort, nor have any truck with self-defeating New Deals,” I, obviously, do not agree. But if you wrote a parallel sentence about the humanitarian activities of the US military in various parts of the globe, I would agree wholeheartedly.  Over the years I’ve had many disagreements with people with broadly similar political commitments, who thought this particular intervention could was worth supporting. As far as I am concerned, when the instruments of the state are marines and cruise missiles, the only possible engagement from the left is protest and obstruction.

War is different from industrial policy. But one can imagine an argument along these lines that would be worth taking seriously. If you wanted to write a stronger critique of the Green New Deal from the left, you might stress the tight links between industrial policy and nationalism, and the frightening anti-China rhetoric that’s a ubiquitous part of the case for public investment.

Here, though, I want to talk about the specifically economic argument, about overproduction.

Riley’s post draws on a long-standing argument among writers for the New Left Review, that the fundamental challenge for contemporary capitalism is overproduction or excess capacity. In this story, the end of the postwar Golden Age was due to the end of US dominance in world trade. Starting in the 1970s, stable oligopolies in manufacturing gave way to to cutthroat competition as producers from an increasing number of countries competed for a limited market. Because manufacturing is so dependent on long-lived, specialized capital goods, producers are unwilling to exit even in the face of falling prices, giving rise to chronic depressed profits and excess capacity, and a turn to financial predation — what Robert Brenner calls neofeudalism — as an alternative outlet for investment. Even when profits recover, there’s little incentive to accumulate new means of production, given that there’s already capacity to produce more than markets can absorb. 

The most influential version of this story is probably Brenner’s book-length New Left Review article from 1998. 2 It is clearly compelling on some level – a lot of people seem to believe something like it. It draws on a long tradition of theories of overproduction and destructive competition, going back at least to the underconsumption theories of Hobson, Lenin and Luxemburg on the one side and, on the other, the first generation of the US economics profession, shaped by the pathological effects of competition between railways. Richard Ely, founder of the American Economics Association, described the problem clearly: “whenever the principle of increasing returns works with any high degree of intensity, competition can never regulate private business satisfactorily.”  His contemporary Arthur Hadley described destructive competition in capital-intensive industries in very much the same terms as Brenner: at prices 

far below the point where it pays to do your own business, it pays to steal business from another man. The influx of new capital will cease; but the fight will go on, either until the old investment and machinery are worn out, or until a pool of some sort is arranged.

(The quotes are from Michael Perelman’s excellent The End of Economics.)

There’s an important truth to the idea that, in a world of long-lived specialized capital goods and constant or falling marginal costs, there is no tendency for market prices to reflect costs of production. Too much competition, and firms will sell at prices that don’t recoup their fixed costs, and drive each other to bankruptcy. Too little competition, and firms will recover their full costs and then some, while limiting socially useful output. No market process ensures that competition ends up at the goldilocks level in the middle.

But while this problem is real, there’s something very strange about the way Riley deploys it as an argument against the Green New Deal. Rather than a story about competition, he — following Brenner — talks as if there was a fixed amount of demand out there that producers must compete for. In a world of overproduction, he says, any public investment will just create more excess capacity, driving down profits and accumulation somewhere else.

In a funny way, this is the mirror image of the Treasury View of the 1930s — which said that any increase in public employment would just mean an equal fall in private employment — or of its modern day successors like Jason Furman and Lawrence Summers. The Furman-Summers line is that the world has only a certain amount of productive capacity; any public spending above that level that will just result in inflation, or else crowding out of private investment. The Brenner-Riley line is that the world has only a certain amount of demand, both in general and for carbon-reducing technology specifically. Try to produce any more than that, and you’ll just have excess capacity and falling profits. Both sides agree that the economy is like a bathtub — try to overfill it and the excess will just run over the sides. The difference is that for first side demand is the water and productive capacity is the tub, while for the other the water is capacity and the tub is demand.

Riley invokes Oskar Lange’s 1930s discussions of electoral socialism in support of his contention that “half-measures are self-contradictory absurdities” — which very much includes any “blather about New Deals.” But the situation facing socialist governments in the 1930s was quite different. Their problem was that any serious discussion of nationalization would terrify capital and discourage investment, sending the economy into a deeper slump and dooming socialists’ prospects for extending their initial electoral gains. This meant that nationalization had to be carried out all at once or not at all — which in practice, of course, meant the latter. (There is a good discussion of this in Przeworski’s Paper Stones.) Keynesian fiscal policy was precisely what offered the way out of this trap, by allowing an expansion of the public sector on terms consistent with continued private accumulation. Riley here is rejecting exactly the solution to the problem Lange identified.

But there’s a deeper problem with the Riley-Brenner vision. In Jim Crotty’s review of Brenner’s long article, he argues that, in response to what Brenner saw as an excessive focus on labor-capital conflict in accounts of the end of the postwar boom, he created an equally one-sided story focused exclusively on inter-capitalist competition. I think this gets to the crux of the matter.

Let’s take a step back.

The development of a capitalist economy is a complex process, which can go wrong at many points. Production on an increased scale requires the expansion of the physical and organizational means of production, with whatever technical and material requirements that entails. Additional labor must be enlisted and supervised. New raw materials must be acquired, and the production process itself has to be carried out on an increased scale. The resulting products have to be sold at a price that covers the cost of production — in other words, there must be sufficient demand. The resulting surplus has to be channeled back to investment. All of this has to take place without excessive changes in relative prices, and in particular without politically destabilizing changes in wages or the distribution of income. The reinvestment stage normally happens via the financial system; the ongoing payment commitments this generates have to be consistently met. And it all must take place without generating unsustainable cross-border payment flows or commitments. 

All of these steps have to happen in sync, across a wide range of sectors and enterprises. A business expanding production has to be confident that the market for its products is also growing, as well as the supply of the inputs it uses, the financing it depends on, and the labor it exploits. An interruption in any of these will halt the whole process. When growth is steady and incremental, this can be mostly taken for granted, but not in the case of more rapid or qualitative change, as in industrialization.

This problem was clearly recognized by earlier development economists. It’s the idea behind the “two gap” and “three gap” models of Hollis Chenery and his collaborators, the “big push” of Rosenstein-Rodan, or Gerschenkron’s famous essay on late industrialization.3  Everything has to move forward together. Industrialization requires not only factories, but ports, railroads, water, electricity, schools. All of these depend on the others. You need savings (or at least credit), and you need demand, and you need labor, and you need foreign exchange.4 

At the same time, an essential feature of the capitalist mode of production is that the various steps each involve different decision makers, acting with an eye only to their own monetary returns. From the point of view of each decision maker, the choices of all the others look like fixed, objective constraints. From the point of view of a particular producer, the question of whether there is sufficient demand to justify additional output is an objective fact. For the producers collectively, it is their decisions that determine the level of demand just as much as — in fact simultaneously with — the level of current output.  But for them individually, it’s a given, an external constraint. 

The problem comes when in thinking about the system as a whole we treat something like destructive competition not as what it is – a coordination problem – but from the partial perspective of the individual producer. From this perspective, it appears as objectively given, as if there were only so much demand to go around. The mainstream, of course, makes the exact same error when they treat the productive capacity of the system as prior to and independent of the actual level of activity. (This is the point of Arjun Jayadev’s and my recent paper on supply constraints.) The fact that when one part of the system moves ahead faster it encounters friction from parts that are lagging imposes genuine limits on the pace of expansion — both supply and demand constraints are real – but we should not treat them as absolute or externally given. 

The faster and farther reaching are the changes in production, the harder it is for a decentralized market system to maintain coherence, and the more necessary conscious, more or less centralized coordination becomes. This was one of the main lessons of the economic mobilization for World War II, and a critical consideration for decarbonization. Planning is ubiquitous in real-world capitalism, and more rapid transformations in activity require planning at a higher level.  

At the same time, we shouldn’t underestimate the capacity of our system of anarchic production for profit to eventually break through the barriers it encounters — something Marx understood better than anyone. That is why it’s become the world-encompassing system it is. Sustained demand will itself call forth the new labor and improved production techniques required to meet it.  Conversely, while Say’s law may not hold in the short run, or as a matter of logic, it is very much the case that improvements in production create new markets, and expand demand qualitatively as well as quantitatively.

Overproduction and excess capacity are not new phenomena. They have been a recurring feature of the great crises that capitalist economies have experienced for the past two hundred years. Here is Jules Michelet’s beautiful contemporary description of the 1842 commercial crisis in France:

The cotton mills were at the last gasp, choking to death. The warehouses were stuffed, and there were no sales. The terrified manufacturer dared neither work nor stop working with those devouring machines. Yet usury is not laid off, so he worked half-time, and the glut grew worse. Prices fell, but in vain; they went on falling until cotton cloth stood at six sous.

We should never forget about the misery and chaos of crises like this. But we should also not forget how this story ends. It is not “and then eventually enough mills were shut down and things went back to how they were before.”

Here’s how the Michelet passage continues:

Then something completely unexpected happened. The words six sous aroused the people. Millions of purchasers — poor people who had never bought anything — began to stir. Then we saw what an immense and powerful consumer the people is when engaged. The warehouses were emptied in a moment. The machines began to work furiously again, and chimneys began to smoke. That was a revolution in France, little noted but a great revolution nonetheless. It was a revolution in cleanliness and the embellishments of the homes of the poor; underwear, bedding, table linen, and window curtains were now being used by whole classes who had not used them since the beginning of the world.

An openness to the possibility of this sort of transformational change is what’s fundamentally missing from both the Summers-Furman and Brenner-Riley views. This is not a system in homeostasis, that if disturbed returns to its old position. It is a system lurching from one unstable equilibrium to another. And this is very relevant, I think, to decarbonization. 

Not so very long ago, it was conventional wisdom that photovoltaic energy was never going to be more than a niche power source — useful when you can’t connect to the grid, but way too expensive to to ever be used at utility scale. And now look — solar accounted for nearly half of new electricity generation installed last year. There’s an almost endless scope for further growth in renewable energy, as more of the economy is electrified. The fact that Silicon Valley Bank was holding a bunch of Treasury bonds does not mean that the field of productive investment has been exhausted.

The tremendous growth of renewable energy over the past generation wouldn’t have happened without public subsidies and regulation. At the same time, most of the actual production has been carried out by employees of private, profit-seeking businesses. Riley is absolutely right that no one should be counting on private investment in education or in care work. Explaining why those activities depend critically on the autonomy and intrinsic motivation of the workers carrying them out, and are therefore inherently unsuited to for-profit businesses, is something we need to keep doing. The same goes for many public functions that have been turned over to contractors. But there are many other areas where it is still possible to harness the profit motive to meet human needs. 

(I am not, to be clear, saying anything about the virtues of markets or the profit motive in the abstract. I would like to progressively eliminate them from human life. I am simply stating the fact that my house was put up by a private builder, for profit, and yet the roof does keep out the rain.) 

There is plenty of scope to criticize the specific content of the IRA and other climate legislation, and the strategic choices of the groups that support them. (Altho a bit of humility is called for with the latter.) But we need to categorically reject the idea that there is some hard constraint such that any program to increase private spending on decarbonization will be canceled out by a reduction in spending somewhere else. 

The bottom line, both for the politics and the economics, is that we need to resist thinking in terms of a change in one area while everything else stays the same. Ceteris paribus may be a useful analytic tool, but it’s fundamentally inapplicable to historical processes where one change creates the pressure, and the possibility, for another. 

Yes, given the existing productive technology, given existing markets, one country’s support for renewable energy might compete with another’s. But these things are not given. Economies of scale exist at the level of the industry as well as the firm; technological progress in one place quickly spills over to others. As, say, hydrogen becomes practical for large-scale energy storage, it will be come practical to produce green energy in areas where it isn’t today. This is as far as you can get from the Brenner paradigm of a zero-sum competition for shares of a fixed market.

The real problem for the Green New Deal and broader industrial policy program is not scarcity, whether of material or of markets. It is twofold. First, it requires a capacity for public planning that is currently lacking, in the US and elsewhere. Industrial policy means building up and legitimating the state’s direct role in a wider range of activity— a challenge when the biggest existing form of direct public provision, the public schools, are under ferocious attack from the right. Second, to the extent that a rush of public and private spending leads to a sustained boom, that will create profound challenges for a system that is used to managing distributional conflicts through unemployment. We’ve gotten a sense of what the political reaction to full employment might look like from recent inflation discourse, with its fears of “labor scarcity.” It’s reasonable, for now, to respond that it’s silly to worry about a wage-price spiral when labor is so weak. But what happens when labor is stronger?

These are real challenges. But we shouldn’t see them as arguments against this program, only as markers for where the next conflicts are likely to be. That’s always how it is. “Gradualism cannot work,” declares Riley, but all politics is incremental. Socialism is only a direction of travel. Even if the “commanding heights of the economy” could “be seized at once” — Riley’s rather ambitious alternative to the Green New Deal — that would only be a step toward the next struggle.

A program to mobilize the existing bourgeois state to push private spending in the direction of meeting human needs, and the need for a habitable planet in particular, faces many obstacles — that is true. Whatever successes the left has had under the Biden administration have been limited and compromised. Some of the most important, like the expansion of unemployment and family benefits, have already been rolled back — that is also true. But the same could be said for all the socialist programs of the past. We have to just keep going, with one eye on the long run direction of travel and the other on the contingencies of the present. The one thing we can say for certain about the future is that it hasn’t happened yet. If we keep going, we will see things that haven’t been seen since the beginning of the world.

New Paper: Rethinking Supply Constraints

I have a new paper on how we conceptualize the supply side of the economy, coauthored with Arjun Jayadev. I presented a version of this at the Political Economy research Institute in December 2022. You can watch video of my presentation here — I come on, after some technical difficulties, around 47:00. (The other presentations from the conference are also very worth watching.) The paper will be published in the upcoming issue of the Review of Keynesian Economics. (The linked version is our draft; when the published version comes out I’ll post that.)

Our fundamental argument is that while macroeconomic supply constraints are normally conceptualized in terms of a level (or level-path) of potential output, in many contexts it would be better to think in terms of a constraint on the rate of change — a speed limit rather than a ceiling.

While this is a general argument, it’s motivate by the experiences of the pandemic and the post-financial crisis recovery of the preceding decade. We think the speed-limit conception of supply constraints makes sense of a number of macroeconomic developments that are hard to make sense of in the conventional view.

First, deviations in output are persistent. We saw this clearly in the wake of the Great Recession, but it seems to be a more general phenomenon. There’s a long-standing empirical finding that there’s no general tendency of output to return to its previous trend. One way we could explain this is the real business cycle way — short-term as well as long-term variation in output growth are driven by changes in the economy’s productive capacity. But of course, there is lots of evidence that business cycles are driven by demand. Alternatively, we could argue that potential grows steadily but actual output may remain far below it indefinitely. I was making arguments like this a few years ago. The problem is that direct evidence on the output gap (unemployment, growth in wages and prices, businesses’ reported capacity utilization rates, etc.) suggest that the output gap did close over the course of the 2010s. So we’re left with the idea that potential output adjusts to actual output — hysteresis. But if we take this idea seriously, it rules out the conventional idea of a level of potential output. In a world where hysteresis is important, a zero output gap is consistent with lots of different level-paths of output; supply constraints only bind the speed of the transitions between them.

Second, there’s no well-defined level of full employment. (Here we have to ding Keynes a bit.) Employment grows steadily over business cycles — there’s no sign of convergence to some long-term trend. Estimates of the NAIRU or natural unemployment rate follow actual unemployment more or less one for one. And if we try to make a bottom-up estimate of full employment — what fraction of the population could plausibly be engaged in paid work — we end up with a value much higher than actual employment even at cyclical peaks.

Third, we observe inflation and other signs of supply constraints in response to changes in the composition of output and employment, and not just in the level. This has been very clear during the pandemic, but there’s good reason to think it’s true in general.

Fourth, increasing returns are pervasive in real economies. This is a bit of a different argument than the first three, since it’s not pointing to a directly observable macro phenomenon. But it’s important here, because it means that we can’t assume that businesses are already using the lowest-cost technique and increasing output will cause unit costs to rise. One way of thinking about this is to imagine a cost landscape that is rugged, not smooth. Moving from one locally low-cost position to another may require traversing a higher cost region, which will appear as supply constraints during the transition. A clear example of this is the transition from carbon to renewable energy sources.

We also argue that this perspective is more consistent with a sociologically realistic view of what “the economy” is. Real economies are not homogeneous “factors” being added to a “production function” which then spits out some quantity of output. They are complex systems of cooperation between human beings, which are embedded in all kinds of other social relationships and the reproduction of households and other social organisms. These relationships cannot be torn up and recreated at any moment — changing them is costly. They evolve only gradually over time. From this point of view, it is wrong to divide the facts about the economic world into a set of long-run, fundamental, exogenous factors and short-run endogenous factors. Who is actually working, and at what, is as much a part of the economic data, no less easily shifted, than the number of people who are potentially available for work.

This way of thinking about the supply side has several implications for policy. First, rising prices and other signs of supply constraints cannot be taken as evidence for the long-run limits on the economy’s productive potential. In general, we should be skeptical of suggestions that recent rises in the prices of energy, food and other essential commodities reflect the “end of abundance”.

On the positive side, our view suggests that the response to positive output gaps should include not only conventional “supply side” measures, but measures to overcome the coordination and information problems and other frictions that limit rapid changes in productive activity. This implies planning of some sort, though not necessarily central planning in the traditional sense. Another implication is that because prices can adjust more quickly than productive activity can (the emphasis on price stickiness is backward in our view), rapid shifts in activity can generate large price spikes that are not informative about long-run production possibilities and produce undesirable shifts in income. This suggests that price regulation has an important role in smoothing the transition fro one pattern of activity to another.

Specific examples and evidence on all these points are in the paper. You should read it! A final point I want to emphasize here is that we are not saying that supply constraints are limits on adjustment speed in an absolute, universal sense. We are saying that insofar as we need a simple, first-cut description of the supply side, we will usually do better to imagine a constraint on adjustment speed rather than on the level of output and employment.

 

What Does It Mean to Say that Inflation Is Caused by Demand?

There has been a lot of debate about whether the high inflation of 2021-2022 has been due mainly to supply or demand factors. Joe Stiglitz and Ira Regmi have a new paper from Roosevelt making the case for supply disruptions as the decisive factor. It’s the most thorough version of that case that I’ve seen, and I agree with almost all of it. I highly recommend reading it. 

What I want to do in this post is something different. I want to clarify what it would mean, if inflation were in fact driven by demand. Because there are two quite distinct stories here that I think tend to get mixed up.

In the textbook story, production takes place with constant returns to scale and labor as the only input. (We could introduce other inputs like land or imports without affecting the logic.) Firms have market power, so price are set as a positive markup over unit costs. The markup depends on various things (regulations, market structure, etc.) but not on the current level of output. With constant output per worker, this means that the real wage and wage share are also constant. 

The nominal wage, however, depends on the state of the labor market. The lower the unemployment rate, and the more bargaining power workers have, the higher the wage they will be in a position to demand. (We can think of this as an expected real wage, or as a rate of change from current wages.) When unemployment falls, workers command higher wages; but given markup pricing, these higher wages are simply passed on to higher prices. If we think of wages as a decreasing function of unemployment, there will be a unique level of unemployment where wage growth is equal to productivity growth plus the target inflation rate.

The conventional story of demand and inflation, from Blanchard. With constant returns to scale and a fixed markup, the real wage is unaffected by short-run changes in output and employment.

You can change this in various ways without losing the fundamental logic. If there are non-labor costs, then rising nominal wages can be passed less than one for one, and tight labor markets may result in faster real wage growth along with higher inflation. But there will still be a unique level of wage growth, and underlying labor-market conditions, that is consistent with the central bank’s target.  This is the so-called NAIRU or natural rate of unemployment. You don’t hear that term as much as you used to, but the logic is very present in modern textbooks and the Fed’s communications.

There’s a different way of thinking about demand and inflation, though, that you hear a lot in popular discussions — variations on “too much money chasing too few goods.” In this story, rather than production being perfectly elastic at a given cost, production is perfectly inelastic — the amount of output is treated as fixed. (That’s what it means to talk about “too few goods”.) In this case, there is no relationship between costs of production and prices. Instead, the price ends up at  the level where demand is just equal to the fixed quantity of goods.

In this story, there is no relationship between wages and prices — or at least, the former has no influence on the latter. Profit maximizing businesses will set their price as high as they can and still sell their available stocks, regardless of what it cost to produce them. 

In the first story, the fundamental scarcity is inputs, meaning basically labor. In the second, what is scarce is final goods. Both of these are stories about how an increase in the flow of spending can cause prices to rise. But the mechanism is different. In the first case, transmission happens through the labor market. In the second, labor market conditions are at best an indicator of broader scarcities. In the first story, the inflation barrier is mediated by all sorts of institutional factors that can change the market power of businesses and the bargaining power of workers. In the second story it comes straightforwardly from the quantity of stuff available for purchase. 

Once concrete difference between the stories is that only in the first one is there a tight quantitive relationship between wages and prices. When you say “wage growth consistent with price stability,” as Powell has in almost all of his recent press conferences, you are evidently thinking of wages as a cost. If we are thinking of wages as a source of demand, or an indicator of broader supply constraints, we might expect a positive relationship between wages and inflation but not the sort of exact quantitive relationship that this kind of language implies.

in any case, what we don’t want to do at this point is to say that one of these stories is right and the other is wrong. Our goal is simply to clarify what people are saying. Substantively, both could be wrong.

Or, both could be right, but in different contexts. 

If we imagine cost curves as highly convex, it’s very natural to think of these two cases as describing two different situations or regimes or time scales in the same economy.1 Imagine something like the figure below. At a point like c, marginal costs are basically constant, and shifts in demand simply result in changes in output. At a point like b, on the other hand, output is very inelastic, and shifts in demand result almost entirely in changes in price.

convex cost (or supply) curve

Note that we can still have price equal to marginal cost, or a fixed markup to it, in both cases. It’s just that in the steeply upward-sloping section, price determines cost rather than vice versa.

Another point here is that once we are facing quantity constraints, the markup over average cost (which is all that we can normally observe) is going to rise. But this doesn’t necessarily reflect an increase in the  markup over (unobservable) marginal cost, or any change in producers’ market power or pricing decisions.

We might think of this at the level of a firm, an industry or the economy as a whole. Normally, production is at a point like a — capitalists will invest to the point where capacity is a bit greater than normal levels of output. As long as production is taking place within the normal level of utilization, marginal costs are constant. But once normal capacity is exceeded by more than some reasonable margin, costs rise rapidly. 

This framework does a couple of things. First, it clarifies that demand can lead to higher prices in two different ways. First, it shifts the demand curve (not shown here, but you can imagine a downward-sloping diagonal line) up and to the right. Second, insofar as it raises wages, it shifts the cost curve upward. The first effect does not matter for prices as long production is within normal capacity limits. The second effect does not matter once production has exceeded those limits. 

Second, it helps explain why shifts in the composition of output led to a rise in the overall price level. Imagine a situation where most industries were at a position like a, operating at normal capacity levels. A big change in the mix of demand would shift some to b and others to c. The first would see lower output at their old prices, while the latter would see little increase in output but a big rise in prices. This has nothing to do with price stickiness or anything like that. It simply reflects the fact that it’s easy to produce at less than full capacity and very hard to produce much above it.

ETA: One of the striking features of the current disinflation is that it is happening without any noticeable weakening of the labor market. We could see that as just one more piece of evidence for the Stiglitz-Regmi position that it was transitory supply problems all along. But if you really want to credit the Fed, you could use the framework here to do it. Something like this:

In a sustained situation of strong demand, businesses will expect to be able to sell more in the future, and will invest enough to raise capacity in line with output. So the cost curve will shift outward as demand rises, and production will remain In the normal capacity, constant marginal cost range. In this situation, the way that demand is raising prices is via wages. (Unlike business capacity, the labor force does not, in this story, respond to demand.) Rising wages raise costs even at normal utilization levels, so the only way that policy can slow process growth is via weaker labor markets that reduce wage growth. But, when demand rises rapidly and unexpectedly, capacity will not be able to keep up in the short run, and we’ll end up on the righthand, steeply upward sloping part of the cost curve. At this point, price increases are not coming from wages or the cost side in general. Businesses cannot meaningful increase output in the short run, so prices are determined from the demand side rather than as a markup. In this context, price stability calls for policy to reduce desired purchases to what business can currently produce (presumably by reducing aggregate income). In principle this can happen without higher unemployment or slower wage growth.

I personally am not inclined to credit the Fed with a soft landing, even if all the inflation news is good from here on out. But if you do want to tell that story, convex supply curves are something you might like to have in your toolkit.

Slides on “Rethinking Supply Constraints”

On December 2-3, 2022, the Political Economy Research Institute at the University of Massachusetts-Amherst (where I did my economics PhD) will be hosting a conference on “Global Inflation Today: What Is To Be Done?”1

I will be speaking on “Rethinking Supply Constraints,” a new project I am working on with Arjun Jayadev. Our argument is that we should think of supply constraints as limits on the speed at which production can be reorganized and labor and other resources can be reallocated via markets, as opposed to limits on the level of production determined by “real” resources. The idea is that this makes better sense of recent macroeconomic developments; fits better with a broader conception of the economy in terms of human productive activity rather than the exchange of pre-existing goods; and points toward more promising responses to the current inflation.

I was hoping to have a draft of the paper done for the conference, but that is not to be. But I do have a set of slides, which give at least a partial sketch of the argument. Feedback is most welcome!