EFF/KRF: The momentum anomaly has been observed in most major markets (Japan is the exception). Many academics claim that trading costs will wipe out any benefits of trying to trade actively on momentum. This will now be tested by live funds. The results will be interesting.
History provides a cautionary tale. Another anomaly that was all the rage among academics was the January effect. Small stocks tend to have high returns in January and lower return in other months. Interestingly, this anomaly seems to be weak in the live returns of small cap mutual funds, raising the possibility that there is something weird in the quoted prices for small stocks around the turn of the year on major databases.
Eugene Fama and Ken French are members of the Board of Directors for and provide consulting services to Dimensional Fund Advisors LP.