I have discussed Modern Monetary Theory in this blog for years (going back to April 2011, when I first found use of the term, to the most recent earlier this year after Olivier Blanchard American Economic Association presidential address last January), and have known the main MMTers going back to at least the mid-1990s, when I was at the New School and working as research assistant to Wynne Godley at the Levy Institute. I guess, I can be seen, to use the term employed by Doug Henwood in his recent Jacobin piece, as a fellow traveller (like Jamie Galbraith), even though I've been critical of some aspects, in particular when applied to developing countries (more on both Henwood and MMT issues in developing countries below).
There are many critiques, which deal with both theoretical issues, mostly concerned with the Functional Finance aspects of MMT, and with the policy and political effects of MMT advising to the left of center Democratic presidential candidates. Note that I will not try to define MMT precisely, since it is a hybrid of economic theories and policy proposals. I would assume that at core it is composed by the ideas of Chartalist and Endogenous Monetary views, Functional Finance, and an Employer of Last Resort (ELR) program as suggested by Greg Hannsgen in his recent presentation at the Eastern Economic Association (EEA), in sessions we co-organized (with the presence of Randy Wray presenting Stephanie Kelton's slides and Josh Mason; Stephanie was with Bernie at the rally in Brooklyn).
My comments will be, for the most part, directed at issues that fall within the Functional Finance part of MMT, and mostly about developed economies like the US (although, I'll have something to say about developing countries like Argentina or Brazil). I might add that Randy suggested that Functional Finance was a late addition to MMT, since this ideas were not known by MMTers in the mid-1990s or so. I think that the original source for the Functional Finance story was Ed Nell, who organized a conference at the New School back in 1997, I think, with Bob Eisner, and many other Old Keynesians. I had read Abba Lerner and Evsey Domar foundational papers in Ed's classes, and I think his influence on MMTers in this area is reasonable to assume.
Let me start with Paul Krugman's critiques of MMT, which have been clear and perhaps the most widely read (but there are many, including critiques by Tom Palley and Sergio Cesaratto here in the blog). So Krugman, in one of his most recent posts, starts by showing that there are many levels of the fiscal deficits that are compatible with full employment (not sure who thinks that this is wrong; I would add the same is true about the rate of interest, and that there is no natural or neutral rate of interest, a point that Keynes made back in the 1930s, and that is coherent with the capital debates, and, hopefully, it will be clear why this is relevant below). Then he argues more problematically, in my view, that crowding out is a serious concern, in his words: "The question then becomes one of tradeoffs: would the things the government could buy with a higher deficit be worth the lost private investment due to a higher interest rate?" But he knows well that the crowding out effect is empirically (if not theoretically) irrelevant, since investment is not particularly responsive to interest rates (he knows it's all about the accelerator); then he moves to the issue of the natural rate itself.
He seems to think two things (he can certainly correct me if I'm wrong). One, that MMT requires that you use monetary policy in order to achieve full employment. Two, that if you are in a situation of like the zero-lower bound, then the central bank cannot bring you back to full employment. That is, her assume that, using his own graph, the economy would be in position A.
So it's unclear what the fuss is all about. If it is because the Fed could, in the MMT story (not sure Functional Finance authors would say that), print money to finance the deficits and bring the economy back to full employment, then the concern might be that it would be inflationary, in a Monetarist sense that printing money might be the cause of inflation. But that does not seem to be his preoccupation (I dealt with the issue of monetization of debt back in May 2011 in a reply to Krugman, who was back then, not surprisingly, criticizing MMT). His concern seems to be that the rate of interest would not go up. But of course, there could be a flat interest rate close to zero, a horizontal monetary policy (MP) line, and the expansion of the IS could be achieved bringing the economy to full employment (right below the C and B points with a zero interest rate).
But that doesn't seem to be the issue either. My guess is that he thinks that the problems is more like the one below, from an older post by him, in which the natural rate of interest is negative (my discussion of that here), and the Fed cannot lead the economy to full employment.
So his point is that the Fed cannot make it because it cannot bring the economy to the natural rate of interest, the one that is compatible with full employment and stable prices. He then goes on to criticize Stephanie on her critique of the natural rate, and tells us that: "So what purpose does claiming that the natural rate is a meaningless concept serve? It looks to me like sophistry – word games intended to confuse what should be a simple issue."
I'm not sure what Stephanie said about the natural rate, but I think it is well-established that the natural rate concept is problematic (note that on this some MMTers have said things I would disagree; e.g. Forstater and Mosler suggest here that the natural rate of interest is zero; my discussion of that here). So I think the position that Krugman attributes to her is correct. Paul Samuelson would agree, as he did when he admitted that the capital debates had shown that neoclassical parables cannot hold (on the capital debates read this old post). So let me explain it briefly. There is no sophistry, just pure logic.
The capital debates show that with factor price reversals, when one good can be said to be capital-intensive at one level of the wage-profit ratio, and labor intensive at another level of the same ratio, there is no monotonic inverse relation between investment and the rate of interest. The investment schedule could look like the one below (my graph), with portions that have a negative slope and some in reverse, and if savings (determined by the level of income as in Keynes' principle of effective demand, rather than a Ramsey inter-temporal model) is given as in the graph below, then there might be no natural rate of interest. Keynes was explicit about that in the General Theory. That means that the monetary authority can set the rate of interest, what Keynes referred to as the normal rate, that was conventional, and that fiscal policy can be used to bring the economy to full employment. Btw, I think that overall Krugman and Kelton agree on that. Krugman says he's defending the theory, not the policy proposals, since he thinks they agree on that.
I'll comment briefly on two additional critiques of MMT, the one by Larry Summers, the ex-Treasury Secretary and advisor to the Clintons and Obama, and the one by Doug Henwood, an influential Marxist (see my discussion of his comments, and others, on Marx for the New York Times here), and writer of a very good book on Wall Street. I am sorry to say that both have too many arguments of authority and ad hominem attacks on some MMT authors, which I'm not interested in discussing. But there are a few substantive issues. One is the danger of inflation (that I'm glad Krugman seemed less keen on) and the others are on MMT and developing countries, and the political relevance and practicality of MMT proposals (here most critics have in mind the Bernie/Ocasio agenda of Medicare for all, cheap or free college tuition in public institutions, a jobs guarantee, and a Green New Deal).
I'll start with Henwood. His major issue is inflation, I would say. He says: "That brings us to the next problem: inflation. When the printing presses run freely, it’s not only reactionaries who think that runs the risk of spiraling prices. As I was researching this piece, many people to whom I described MMT, from Democrats to Marxists, brought it up as a worry. MMTers are coy about the topic — they never say how much is too much, and they profess great confidence in their ability to control it." Let me start by saying that inflation has not been a problem in 40 years, while wage stagnation is a central one. But if one is concerned about it, at least one should get the correct analytical tools to discuss it.
He tells us that: "The standard view of the Weimer inflation is that the German economy, severely damaged by World War I and forced to make huge reparations payments to the victors, wasn’t up to the task — it just didn’t have the productive capacity, and its citizens were both unwilling and unable to pay the necessary taxes. So instead the government just printed money and spent it, not only to pay its own bills, but to support bank lending to the private sector." First, that's NOT the standard view of the hyperinflation in Germany. You can read here the standard story, and I cite even a conservative historian like Niall Ferguson admitting that the monetarist story embraced by Henwood is NOT the dominant view among historians. The notion that the economy was at full capacity (didn't have productive capacity) and that printing money caused inflation is what Cagan thought about it. A more refined and somewhat structural story is the dominant view actually. In my view, it is clear that debt in foreign currency (not domestic), and, hence, the external problems of the current account, that forced depreciation, together with wage resistance are at the core of the hyper., German and many others.
In addition, it's worth emphasizing that the US is not Weimar Germany, in the sense that even with much larger fiscal deficits, debt would still be in domestic currency, and no significant pressure for depreciation would arise. The role of the dollar as reserve currency is not really under significant jeopardy. Certainly, there might be questions of inflation if we reach full employment, and that's a different issue (I'll come back to the topic below when I discuss Summers and the political feasibility of MMT sponsored plans). But the kind of alarmism of even suggesting that the US would be on the verge of hyperinflation is not serious. I won't comment on other primary mistakes like the notion that the rise of Nazism is associated to the hyper, when it is clearly connected to the Depression and deflation a decade later.
Henwood is on firmer ground, actually, when he discusses the external limits. Yes, indeed, for most developing countries like Argentina or Brazil, the ability to pursue expansionary fiscal policy is severely limited by the balance of payments constraint. Considerably before full employment, the patterns of consumption and investment may require too many imports, particularly of intermediary and capital goods, and even with capital controls, interest rates might be hiked to avoid capital flight and depreciation. Depreciation does solve the external problem, often by throwing the economy in a recession, and not because it stimulates exports. There is extensive discussion of that in the blog about it. Sometimes MMTers sounded like New Developmentalists in Latin American suggesting that depreciation would solve the external constraint and that capital controls were not even necessary. I don't think Randy believes that (or Stephanie), but it was certainly something that Warren Mosler believed in the past (whether he changed his mind I can't tell). But again the debate seems to be about the feasibility of MMT in the US (that's why I didn't emphasize in my comments on the roundtable the differences of debt in domestic and foreign currency, something I always do, as noted by Josh).
So that leads me to the last critique, the one by Larry Summers in his recent piece in WAPO. Summers says that: "Modern monetary theory... is the supply-side economics of our time" and that "these new ideas [about the importance of fiscal deficits] are being oversimplified and exaggerated by fringe economists who hold them out as offering the proverbial free lunch: the ability of the government to spend more without imposing any burden on anyone." He also says in Monetarist fashion that printing money would lead to hyperinflation. In his words: "As the experience of any number of emerging markets demonstrates, past a certain point, this approach leads to hyperinflation. Indeed, in emerging markets that have practiced modern monetary theory, situations could arise where people could buy two drinks at bars at once to avoid the hourly price increases. As with any tax, there is a limit to the amount of revenue that can be raised via such an inflation tax. If this limit is exceeded, hyperinflation will result." Again, emerging markets, like Germany, borrowed in foreign currency, that they cannot print. It was often the depreciation of the currency, the increase in the prices of imported goods, and the wage resistance of workers that led to hypers, and the central bank printed money afterwards, with money being endogenous. A foreign debt or external problem, not a fiscal one.
But there might be a danger of inflation (not hyper) if Bernie wins the election and manages to pass Medicare for all, free college, a Job Guarantee and actually spend some money on infrastructure, and to do something about global warming, without significant reshuffling of spending. Here is where I think the question of the supposed naïveté of MMTers comes to play, with Henwood suggesting that they shirk the question of fiscal choices, and with Summers saying they resemble voodoo economics, the supply-side of the left (mind you supply-siders are many things, but certainly not naïve). I think, first of all, that the dangers of inflation are exaggerated, for several reasons. First, the labor market is not as tight as normally suggested. The number of people discouraged and out of the labor force is relatively large. Second, there are positive effects of growth on productivity (the Kaldor-Verdoorn effect, search on the blog too), so the supply constraint is not fixed, rigid at one given level (people said the natural rate of unemployment was 5 percent or higher just a few years back; again check past blog posts). Third, the bargaining power of unions, and workers in general, is not particularly strong, and it would take sometime to pick up.
More importantly, there is no chance that a Bernie presidency (and that's in and of itself a big if) would have both houses and could implement even a little bit of the program presented. Mind you if it happened we would probably get to full employment in a couple of years, and get increases in wages, and perhaps some inflation. But some inflation might be good, in particular if it allows for higher real wages, something sorely needed. How much inflation? Difficult to say, but the structure of the Fed is not going to vanish, and higher rates would be used to discipline the labor class, with the support of many neoliberal Dems. The limit will come probably before full employment and the capacity limit of the economy is reached (yes inflation happens before the capacity limit, because it's often cost push, and the sort of demand pull stuff Summers and Henwood are afraid about is not that common). In other words, the limits to fiscal expansion would be political, not economic, and there is no reason for the left to be up in arms against an imaginary enemy. Hyperinflation is like the the windmills for the Quijote. The giants to attack are actually the ones pointed out in the progressive agenda, like lack of spending on health, education and the environment, and MMTers have been instrumental in getting these ideas in the political discourse, and moving the Dems to the left.
But taxes matter too. Here is where the MMTers refusal to acknowledge that taxes on the wealthy are necessary is a political mistake (not all I've been told, but some for sure, as I've heard that criticism). Note that from the logical point of view they are not incorrect in suggesting that causality goes from spending to taxes, like it goes from investment to savings. It's implicit in the Keynesian/Kaleckian model in which autonomous spending (government spending is in there) determines income through a multiplier process. And taxes, like savings, grow with income. But it is important to note that politically (again this is not analytically, but politically) countries that went for a more ample Welfare State opted to tax their citizens, particularly their more wealthy citizens, at a higher rate. Tax increases on the wealthy should be (and are) part of the progressive agenda. It has an important distributive effect, and it makes the spending politically acceptable. At this juncture, however, even Blanchard says that we should just borrow, since interest rates are low, and will remain low.
The crucial point is that overall MMTers have been helpful in moving the Dems in the right direction (the right direction is to the left), and that is a good thing. The problem with Dems is not the existence of a few social democrats or socialists in their midst. In fact, even being generous there will probably be just three democratic socialists in the presidential primaries (Bernie, and, perhaps, Warren and Tulsi). The problem is the vast majority of neoliberals that still dominate the party. The same could be said about MMT. The problem is not the exaggerated propositions of MMTers, but the excessive fear of inflation when there are too many relevant problems to be concerned with.