More recently, Lehmann (1990) and Lo and MacKinlay (1990) have also documented
significant short-term price reversals. Lehmann finds that stocks with negative returns in
one week experience positive returns in the following week. This finding suggests that
stocks that are “winners” and “losers” during one week experience sizeable return reversals
during the following week; this phenomenon suggests that arbitrage profits are possible.
DeLange (1998) provides evidence of traders using the contrarian investment strategy and
Dreman (1998) encourages the use of a contrarian strategy.