"I could tell you a story about my friend and colleague Milton Friedman. In the nineteen-seventies, we were sitting in the Ph.D. oral examination of a Chicago economist who has gone on to make his mark in the world. His thesis was on rational expectations. After heâd left, Friedman turned to me and said, âLook, I think it is a good idea, but these guys have taken it way too far.âIt became a kind of tautology that had enormously powerful policy implications, in theory. But the fact is, it didnât have any empirical content. When Tom Sargent, Lard Hansen, and others tried to test it using cross equation restrictions, and so on, the data rejected the theories. There were a certain section of people that really got carried away. It became quite stifling."
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James Heckman, in "Interview with James Heckman" by John Cassidy (January 14, 2010).
https://en.wikiquote.org/wiki/Rational_expectations
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