Anyone who follows financial markets has to wonder at times, “What are people thinking? How did they come to make those decisions?”
It’s hard to imagine that John Muth and Robert Lucas came up with what’s known as the “rational-expectations theory,” wherein, as explained in Wikipedia,
it is assumed that outcomes that are being forecast do not differ systematically from the market equilibrium results. That is, it assumes that people do not make systematic errors when predicting the future, and deviations from perfect foresight are only random.
Muth and Lucas should watch daily programs on the financial channels like Jim Cramer’s Mad Money, which is supposedly to help individual investors, or CNBC’s Fast Money, a show clearly geared toward speculators. No viewer can watch these shows and walk away believing, “people do not make systematic errors when predicting the future.”
So while financial markets have been a series of speculative bubbles as the Federal Reserve creates money ad infinitum, rational-expectations economists Robert Flood and Robert Hodrick daringly conclude, “The current empirical tests for bubbles do not successfully establish the case that bubbles exist in asset prices.”