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Monday, February 11, 2013

Phelps on Rational Expectations

Ed Phelps does not like rational expectations:

Expecting the Unexpected: An Interview With Edmund Phelps, by Caroline Baum, Commentary, Bloomberg: ...I talked with [Edmund Phelps] ... about his views on rational expectations...
Q: So how did adaptive expectations morph into rational expectations?
A: The "scientists" from Chicago and MIT came along to say, we have a well-established theory of how prices and wages work. Before, we used a rule of thumb to explain or predict expectations: Such a rule is picked out of the air. They said, let's be scientific. In their mind, the scientific way is to suppose price and wage setters form their expectations with every bit as much understanding of markets as the expert economist seeking to model, or predict, their behavior. ...
Q: And what's the consequence of this putsch?
A: Craziness for one thing. You’re not supposed to ask what to do if one economist has one model of the market and another economist a different model. The people in the market cannot follow both economists at the same time. One, if not both, of the economists must be wrong. ... Roman Frydman has made his career uncovering the impossibility of rational expectations in several contexts. ...
When I was getting into economics in the 1950s, we understood there could be times when a craze would drive stock prices very high. Or the reverse... But now that way of thinking is regarded by the rational expectations advocates as unscientific.
By the early 2000s, Chicago and MIT were saying we've licked inflation and put an end to unhealthy fluctuations –- only the healthy “vibrations” in rational expectations models remained. Prices are scientifically determined, they said. Expectations are right and therefore can't cause any mischief.
At a celebration in Boston for Paul Samuelson in 2004 or so, I had to listen to Ben Bernanke and Oliver Blanchard ... crowing that they had conquered the business cycle of old by introducing predictability in monetary policy making, which made it possible for the public to stop generating baseless swings in their expectations and adopt rational expectations...
Q: And how has that worked out?
A: Not well! ...
[There's more in the full interview.]

    Posted by on Monday, February 11, 2013 at 10:44 AM in Economics, Macroeconomics, Methodology | Permalink  Comments (30)


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