The Economics of Imperfection. (Economics, Labor & Business)

Article excerpt

"Behavioral Macroeconomics and Macroeconomic Behavior" by George A. Akerlof and "Information and the Change in the Paradigm in Economics" by Joseph E. Stiglitz, in The American Economic Review (June 2002), 2014 Broadway, Ste. 305, Nashville, Tenn. 37203.

If you were an undergraduate between the 1960s and 1980s, chances are that the name Paul Samuelson rings a bell. An economist at the Massachusetts Institute of Technology, Samuelson was the author of Economics, long the most widely used textbook in introductory college economics courses. Economics embodied something called "the neoclassical synthesis," the mainstream doctrine that arose out of the post-World War II effort to reconcile the ideas of John Maynard Keynes and those descended from Adam Smith. The fact that Economics is no longer the field's dominant textbook suggests what has become of the synthesis.

Akerlof and Stiglitz, of the University of California, Berkeley, and Columbia University's Graduate School of Business, respectively, shared the Nobel Prize in economics last year (along with Michael Spence) for work that has turned a good part of the economics discipline in a new direction. In their acceptance speeches, reprinted in The American Economic Review, they explain what happened.

The neoclassical synthesis--along with its updated successor, the New Classical economics--holds that markets always tend toward "general equilibrium." Whether the market is for factory workers or candy bars, in other words, supply and demand will eventually reach a perfect, albeit temporary, balance if left to their own devices.

In the real world, of course, that doesn't seem to happen, as the theory's proponents themselves have recognized and tried to explain (the Nobel Prize committee has also rewarded their work, as it did Paul Samuelson's before). Akerlof and Stiglitz, however, proposed a more sweeping explanation than these defenders of the synthesis, under the unsexy rubric "asymmetric information." It suggests that economic transactions are powerfully affected by the fact that buyers and sellers--in, for example, the used car market--don't all have the same information. …