Överreaktion på aktiemarknaden - Myt eller verklighet?
MarknadseffektivitetBehavioral financeAnomalierÖverreaktionContrarian StrategiesEconomicsEconometricsEconomic theoryEconomic systemsEconomic policyNationalekonomiEkonometriEkonomisk teoriEkonomiska systemEkonomisk politikBusiness and Economics
PurposeThe purpose of this paper is to assess whether the overreaction found in ?Does the Stock Market Overreact?? by DeBondt and Thaler still persists today, and by equivalence test if a trading strategy based upon these assumptions would generate abnormal returns. MethodThe research has been carried out by studies of the stocks that for a prior period of one year has over or underperformed their benchmark. The stocks used in my study are all part of S&P500 index, and the period of study runs from three to five overlapping years over the last twenty years. ResultsMy tests indicate that the type of overreaction proposed by DeBondt & Thaler still is present, at least considering the stocks that during the formation period were winners.