News media stimulate bubbles, since stories about them boost their audience.

Each profession has its own toolkit.

Can a controlled experiment explain why people like Kewpie dolls in one year, Beanie Babies in another, and American Girl dolls this year? Yet social scientists are asked to answer analogous questions. We economists and perhaps psychologists shouldn't overreact to the derision. That is, we shouldn't try to overlay a false sense of precision on our admittedly squooshy work.

Stock prices are likely to be among the prices that are relatively vulnerable to purely social movements because there is no accepted theory by which to understand the worth of stocks....investors have no model or at best a very incomplete model of behavior of prices, dividend, or earnings, of speculative assets.

The ability to focus attention on important things is a defining characteristic of intelligence.

Economics is (now) about emotion and psychology.

A major boom in real stock prices in the US after Black Tuesday brought them halfway back to 1929 levels by 1930. This was followed by a second crash, another boom from 1932 to 1937, and a third crash. Speculative bubbles do not end like a short story, novel, or play. There is no final denouement that brings all the strands of a narrative into an impressive final conclusion. In the real world, we never know when the story is over.