Change is Good or the Disposition Effect Among Mutual Fund Managers by Anna Scherbina, Li Jin

Previous research has shown that individual investors often hold on to losing stocks for too long. It has largely been assumed that this is because individuals are reluctant to admit their mistakes. Empirically this has been shown by many including Odean 1998.There is some, although less persuasive evidence that professional money managers are less likely to make this financial error. Short