Market Efficiency, Long-Term Returns, and Behavioral Finance1The Comments of Brad Barber, David Hirshleifer, S.P. Kothari, Owen Lamont, Mark Mitchell, Hersh Shefrin, Robert Shiller, Rex Sinquefield, Richard Thaler, Theo Vermaelen, Robert Vishny, Ivo Welch, and a Referee Have Been Helpful. Kenneth French and Jay Ritter Get Special Thanks.1