“The stampede toward “rational expectations” — widely thought to be a “revolution,” though it was only a generalization of the neoclassical idea of equilibrium—derailed the expectations-driven model building that had just left the station. In the end, this way of modeling has not illuminated how the world economy works.”

— Edmund Phelps

Edmund S. Phelps (2007) "Foreword," in Roman Frydman and Michael D. Goldberg, Imperfect Knowledge Economics: Exchange Rates and Risk.

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Edmund Phelps 2

American economist 1933

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“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

“In the early 1970s,… economists began to embrace the Rational Expectations Hypothesis (REH), according to which market participants’ expectations are “essentially the same as the predictions of the relevant economic theory” (Muth 1961: 316). What has been largely overlooked is that, … REH theorists presume that the role of market participants’ expectations in driving outcomes is not autonomous from the other components of the model. … Because REH models, by design, rule out an autonomous role for expectations, they are best viewed as derailing, rather than developing, the microfoundations approach.”

Roman Frydman (1948) American economist

"Which Way Forward for Macroeconomics and Policy Analysis?" 2013

“I was reminded of how much I had misjudged the potential the profession would see in the time series rational expectations models. When I, as a graduate student at the Massachusetts Institute of Technology (MIT) around 1970 did some work on the econometrics of rational expectations time series models, I felt rather apologetic about the extreme assumptions in the models. I did not expect others to regard them as anything more than a passing gimmick. Richard Sutch had just written in his MIT doctoral dissertation (1968) an exposition of the coefficient restrictions implied for time series representations of long-term and short-term interest rates, but he never bothered to publish this work. I remember conversations with him and others about rational expectations models, and I did not come away thinking they were the wave of the future.”

Robert J. Shiller (1946) American economist

Robert J. Shiller (1984), Review of Rational Expectations and Econometric Practice by Robert E. Lucas, Thomas J. Sargent.

“At the center of market fundamentalism lies the general acceptance of the Walrasian general equilibrium model, or the neo-classical paradigm. Although many economists came to doubt the universal validity of such models in view of economies of scope, bounded rationality, asymmetric information, and other types of market imperfections and ventured into institutional analysis, the orthodoxy still remains the one which postulate some type of rationality of atomized individuals and the market which mediate among these atomized individuals and firms to reach some stable equilibrium.”

Eisuke Sakakibara (1941) Japanese economist and critic

The End of Market Fundamentalism (1999)

“Monetary policy decisions tend to regress toward the mean and to be inertial—and hence biased in just the same way that adaptive expectations are biased relative to rational expectations. But errors like that, while systematic, will generally be small and will tend to shrink over time. And, in return, the system builds in natural safeguards against truly horrendous mistakes.”

Alan Blinder (1945) economist

Source: Central Banking in Theory and Practice. 1998, p. 31

“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).

“Keynesian economics is really just models and numbers and how things would work in a laboratory, not how things work in the real world.”

Glenn Jacobs (1967) American professional wrestler and actor

07:20–08:05.
"Glenn 'Kane' Jacobs Mental Smackdown of Tennessee Lt Governor" http://www.youtube.com/watch?v=-bWJwJr-R68 (2013)
Context: Keynesian economics is really just models and numbers and how things would work in a laboratory, not how things work in the real world. The beauty of Austrian economics is [that] it studies how things work in the real world. Economics is not a predictive science, okay? You can't say, "If we do this, this is what's gonna happen." It is a descriptive science; in other words, it describes what's going on. Austrian economics says the economy runs itself, and all that we're trying to do is understand how the economy really works.

“Archetypes, color, and components will forever change how you build Java models. We build Java models with teams of developers. In our day-to-day mentoring, we develop and try out new ideas and innovations that will help those developers excel at modeling.”

Peter Coad (1953) American software entrepreneur

Peter Coad, Jeff de Luca, and Eric Lefebvre. (1999) Java Modeling Color with Uml: Enterprise Components and Process with Cdrom. Prentice Hall PTR.

“Part of the downfall came early and on theoretical grounds, with the realization that real-world information lags for aggregate variables like the price level and money supply were much too short to rationalize the persistent multiyear deviations from equilibrium that seemed to characterize business cycles in most industrialized countries. The second dubious assumption, continuous market clearing, was viewed more critically once it was recognized that it was not an inextricable concomitant of rational expectations, especially when Stanley Fischer (1977) and Edmund Phelps and John Taylor (1977) showed that rational expectations could be embedded in a model containing real-world institutional features like multiperiod wage and price contracts to generate nonmarket-clearing behavior. Once Fischer and Phelps-Taylor had shown that rational expectations by itself was a necessary but not a sufficient condition to validate new-classical policy conclusions, the race was on to develop the new-Keynesian theory based on rational expectations and one or another institutional impediment to continuous market clearing.”

Robert J. Gordon (1940) American economist

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

“Macro rational expectations, as I have labeled the hypothesis, seems to say that expectations in an economist's model must be perfectly consistent with his model that embodies these expectations. In other words, the agents of his model must all share his views of the relevant economic mechanisms, as well as his data. Why? Because if he holds them they must believe they are God's truth and, if so, rational people can have no other views (and of course we should never ask how they would come by these views and data, that not even other specialists may have heard of yet, let alone accepted). I submit that this view is pretty absurd--I would almost say offensive! I certainly believe that I know more about economics and the economy than (almost) everybody else, and i can even prove it: If everybody shared my vies, then the economy could not be in today's troubles”

Franco Modigliani (1918–2003) Italian-American economist

though it might conceivably be in some different ones!
Conversations with Economists (1983)

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