Some of the most interesting work in modern economic theory explores a pervasive social phenomenon: the informational cascade. The concept, first elaborated in a brilliant 1992 paper by Sushil Bikhchandani, David Hirshleifer, and Ivo Welch, illuminates countless social and economic surprises. It is impossible to understand the real estate bubble, or the current financial crisis, without exploring the dynamics of informational cascades. Policymakers should consider its implications in seeking ways to respond to today’s economic chaos.
From Wall Street’s Lemmings, in the New Republic: