RICHARD H. THALER is Henrietta Johnson Louis Professor of Economics, and director of the Center for Behavioral Economics and Decision Research, Johnson Graduate School of Management, Cornell University. CONTRIBUTORS: Lawrence M. Ausubel, Victor L. Bernard, Fischer Black, Navin Chopra, David M. Cutler, Werner F. M. De Bondt, J. Bradford De Long, Jeffrey A. Frankel, Kenneth R. French, Kenneth A. Froot, Josef Lakonishok, Charles M. C. Lee, James M. Poterba, Jay R. Ritter, Richard Roll, Hersh M. Shefrin, Robert J. Shiller, Andrei Shleifer, Meir Statman, Jeremy Stein, Lawrence H. Summers, Richard H. Thaler, Robert W. Vishny, and Robert J. Waldmann