Paul Krugman

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"What’s odd about Friedman’s absolutism on the virtues of markets and the vices of government is that in his work as an economist’s economist he was actually a model of restraint. As I pointed out earlier, he made great contributions to economic theory by emphasizing the role of individual rationality—but unlike some of his colleagues, he knew where to stop. Why didn’t he exhibit the same restraint in his role as a public intellectual? The answer, I suspect, is that he got caught up in an essentially political role. Milton Friedman the great economist could and did acknowledge ambiguity. But Milton Friedman the great champion of free markets was expected to preach the true faith, not give voice to doubts. And he ended up playing the role his followers expected. As a result, over time the refreshing iconoclasm of his early career hardened into a rigid defense of what had become the new orthodoxy. In the long run, great men are remembered for their strengths, not their weaknesses, and Milton Friedman was a very great man indeed—a man of intellectual courage who was one of the most important economic thinkers of all time, and possibly the most brilliant communicator of economic ideas to the general public that ever lived. But there’s a good case for arguing that Friedmanism, in the end, went too far, both as a doctrine and in its practical applications. When Friedman was beginning his career as a public intellectual, the times were ripe for a counterreformation against Keynesianism and all that went with it. But what the world needs now, I’d argue, is a counter-counterreformation."

- Paul Krugman

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"I cannot forbear to lengthen an already long paper by adding some remarks about what Paul Krugman calls the "new international economics" (Strategic Trade Policy and the New International Economics, MIT paperback, 1986) and "new trade theory" (in "New Trade Theory and the Less Developed Countries," a paper submitted to the Carlos F. Diaz-Alejandro memorial conference held in Helsinki, August 23-5, 1986). The "new" theory rests on economies of scale. As I told Krugman at Helsinki, I find it a bizarre notion that increasing returns in international trade are new. I developed it at length in my 1953 textbook, based on the 1929 article of John Williams, reprinted in the AEA, "Readings in the Theory of International Trade." Jan Tinbergen developed it in his textbook, International Economic Integration (1954). I recall the joy in Cambridge, Massachusetts, when Kenneth Arrow made increasing returns respectable by formalizing Alfred Marshall's description of long-run decreasing costs historically with his paper on "Learning by Doing," a paper rapidly incorporated into international-trade theory by those who need formal models to understand the intuitively obvious. I confess to some irritation over Krugman's defense of his international-trade theory as new because it offers a well-worn truth in equation form."

- Paul Krugman

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"I grew to understand how the Chicago School argued, and I can do it myself, but they were lying about how they arrived at their conclusions. I could see that they were obviously lying, but I was just annoyed and shocked that they continued to lie about how they got to the questions that they got to. And then it gradually occurred to me that if this is true, then maybe the whole profession is lying, and that belief has gotten stronger as I have gotten older. People say, "We do econometrics, and that tests our hypotheses." Baloney. We do theory. I was just rereading last night Paul Krugman's famous article where he tries to introduce geographical considerations into economics, and it is a very skillfully done article. It's rhetorically very skillful. I can show you how it works rhetorically, but it is complete nonsense scientifically, not because it is wrong but because it is arbitrary. There are a zillion other ways of formalizing geography in economics that would come to opposite conclusions to those he comes to, and yet he's kind of airily saying that this is a contribution. Then there are a thousand other articles modifying that. It doesn't get anywhere: they modify it and get completely different conclusions. If you change your assumptions, you get different theorems. So the whole exercise, it gradually dawned on me, was complete nonsense, so that's what turned me. But it is unfair and kind of stupid to say that I stopped doing economics."

- Paul Krugman

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