“For policy, the central fact is that Keynesian policy recommendations have no sounder basis, in a scientific sense, than recommendations of non-Keynesian economists or, for that matter, non-economists.”

— Thomas J. Sargent

Robert Lucas, Jr. and Thomas J. Sargent, "After Keynesian macroeconomics", After the Phillips Curve: Persistence of High Inflation and High Unemployment (1978).

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American economist 1943

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“For policy, the central fact is that Keynesian policy recommendations have no sounder basis, in a scientific sense, than recommendations of non-Keynesian economists or, for that matter, non-economists.”

Robert Lucas Jr. (1937) American economist

"After Keynesian macroeconomics" 1978

“In the past few years there has grown up a large group of young economists who have accepted the theoretical doctrines of the Keynesian Revolution and who have come into national prominence through their support of an economic policy of full employment.”

Lawrence Klein (1920–2013) American economist

The Keynesian Revolution. Vol. 19. New York: Macmillan, 1947/66. p. 156.

“Notwithstanding the predominant role in academic economic theory that Keynes and Keynesian economics achieved during the twentieth century, his basic outlook and policy recommendations were shaped by the particular experiences of the British Empire’s waning years.”

Alan O. Ebenstein (1959) American political scientist, educator and author

Hayek's Journey: The Mind of Friedrich Hayek (2003)

“Lucas and Sargent’s main argument was that Keynesian economics had ignored the full implications of the effect of expectations on behavior. The way to proceed, they argued, was to assume that people formed expectations as rationally as they could, based on the information they had. Thinking of people as having rational expectations had three major implications, all highly damaging to Keynesian macroeconomics. …
The first implication was that existing macroeconomic models could not be used to help design policy. … The second implication was that when rational expectations were introduced in Keynesian models, these models actually delivered very un-Keynesian conclusions. … The third implication was that if people and firms had rational expectations, it was wrong to think of policy as the control of a complicated but passive system. Rather, the right way was to think of policy as a game between policy makers and the economy. …
To summarize: When rational expectations were introduced, Keynesian models could not be used to determine policy; Keynesian models could not explain long-lasting deviations of output from the natural level of output; the theory of policy had to be redesigned, using the tools of game theory.”

Olivier Blanchard (1948) French economist

Source: Macroeconomics (7th Edition, 2017), Ch. 24 : Epilogue: The Story of Macroeconomics

“The principal customers aimed for are other economists or members of other professions, who are somewhat closer to the making of policy recommendations… The question of the clientèle is even more baffling when the problem concerns growth paths for time spans covering several generations. What can at best be recommended in that case is the signal the present generation gives, the tradition it seeks to strengthen or establish, for succeeding generations to take off from.”

Tjalling Koopmans (1910–1985) Dutch American economist

Source: Concepts of Optimality and Their Uses, 1975, p. 244, as cited in: Vincent Martinet (2012) Economic Theory and Sustainable Development. p. 90

“Harmony, liberal intercourse with all nations, are recommended by policy, humanity, and interest.”

George Washington (1732–1799) first President of the United States

1790s, Farewell Address (1796)

“Hayek opposed not merely Keynes’s policy recommendations, but his technical method.”

Alan O. Ebenstein (1959) American political scientist, educator and author

Hayek's Journey: The Mind of Friedrich Hayek (2003)

“Economists have the least influence on policy where they know the most and are most agreed; they have the most influence on policy where they know the least and disagree most vehemently.”

Alan Blinder (1945) economist

Hard Heads, Soft Hearts: Tough-Minded Economics for a Just Society (1987)

“Monetarism—both of the older Friedman version stressing adherence to money stock targets and of the newer rational expectations variety—has been badly discredited. The stage has been set for recovery in the popularity of Keynesian diagnoses and remedies. I do not mean to imply, of course, that there is some Keynesian truth, vintage 1936 or 1961, to which economists and policymakers will or should now return, ignoring the lessons of economic events and of developments in economics itself over these last turbulent fifteen years. I do mean that in the new intellectual synthesis which I hope and expect will emerge to replace the divisive controversies and chaotic debates on macroeconomic policies, Keynesian ideas will have a prominent place.”

James Tobin (1918–2002) American economist

James Tobin, "Keynes' Policies in Theory and Practice", Challenge (1983).
1970s and later

“Keynesian theory initially prevailed because it did a far better job than classical orthodoxy of making sense of the world around us, and Friedman’s critique of Keynes became so influential largely because he correctly identified Keynesianism’s weak points. And just to be clear: although this essay argues that Friedman was wrong on some issues, and sometimes seemed less than honest with his readers, I regard him as a great economist and a great man.”

Paul Krugman (1953) American economist

"Who Was Milton Friedman?", The New York Review of Books (February 15, 2007)
The New York Review of Books articles

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