“New-classical economics has been undeniably influential, but not in the way that its three prominent creators originally imagined. Its most important contribution to macroeconomics, the assumption of rational expectations, was stolen almost immediately, and applied more fruitfully, by the new Keynesians.”

— Robert J. Gordon

"Fresh Water, Salt Water, and other Macroeconomic Elixirs", 1989

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Robert J. Gordon 11

American economist 1940

Robert J. Gordon (1940) American economist

"Fresh Water, Salt Water, and other Macroeconomic Elixirs", 1989

“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

“One troublesome aspect is the place of rational expectations macroeconomics in the often political debate over Keynesian economics. At least implicitly, many people feel that what's bad for the rational expectations viewpoint is good for the Keynesian one, and vice versa. But it is hard to see how the problems in using the rational expectations approach to explain monetary nonneutrality can alleviate the theoretical and empirical shortcomings of the Keynesian model.”

Robert Barro (1944) American classical macroeconomist

Robert J. Barro, "Rational Expectations and Macroeconomics in 1984" (1984).

“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

“[New classical economics] was the starting point for a rightward shift in economics that went against the idea that monetary policy can improve macroeconomic outcomes.”

Janet Yellen (1946) American economist and professor

The Hand on the Lever (2014)

“Since the late 1960s macroeconomic debates in the United States have centered on the competing interpretations of the new classical and new Keynesian macroeconomics. The initial new classical model developed in the early 1970s by Robert E. Lucas, Jr., combined market-clearing, imperfect information, and rational expectations. After much testing, it was eventually rejected in the late 1970s for failing to explain why business cycles lasted on average four years while information delays lasted only a few weeks. It was soon replaced by a second new classical approach, the Real Business Cycle (RBC) model, which was also based on continuous market clearing and competitive equilibrium, but now generated the business cycle through serially correlated procyclical technology shocks.”

Robert J. Gordon (1940) American economist

Robert J. Gordon, Are Procyclical Productivity Fluctuations a Figment of Measurement Error? (1992).

“It is too early to say there is a consensus about how all these topics fit together. Yet one can say that the new classical challenge has been met: Keynesian economics has been reincarnated into a body with firm microeconomic muscle.”

N. Gregory Mankiw (1958) American economist

N. Gregory Mankiw, "The reincarnation of Keynesian economics", European Economic Review (1992).
1990s

“If we look beyond the issue of monetary nonneutrality, then we do find areas of macroeconomics that use rational expectations and in which important recent progress has been made.”

Robert Barro (1944) American classical macroeconomist

Robert J. Barro, "Rational Expectations and Macroeconomics in 1984" (1984).

“Perhaps the most important contribution to science that the Royal Society has made in its three centuries of existence is its early role in publishing Newton's masterful account of his discoveries.”

Julian Schwinger (1918–1994) American theoretical physicist

Einstein's Legacy: The Unity of Space and Time (2002) p. 2

“Ball, Mankiw, Romer and others style themselves as New Keynesians. Their program is to develop improved microeconomic foundations for imperfectly flexible prices. In the process, they hope to illuminate the paradox that individually rational or near-rational behavior can result in significant collective market failures. These are certainly laudable objectives. In the end, I suspect, the program will not change the essential substance of Keynesian macroeconomics. But it will make Keynes more palatable to theorists.”

James Tobin (1918–2002) American economist

"Price Flexibility and Output Stability: An Old Keynesian View" (1993)

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