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The Time-Varying Nature of the Overreaction Effect: Evidence from the UKPanagiotis AndrikopoulosDe Montfort University - Department of Accounting and Finance Arief DaynesUniversity of Portsmouth - Business School Paraskevas PagasUniversity of Portsmouth August 11, 2011 International Journal of Banking and Finance, Vol. 8, No. 3, pp. 1-36, 2011 Abstract: Previous studies on the overreaction effect in the UK show that prior losers consistently outperform prior winners in the period 1975 to 1990. This paper extends current knowledge by assessing the above phenomenon in the UK market for the period 1987 to 2007. In contrast to earlier research, we produce evidence of a weak presence of the overreaction effect for the latest test period. Further, we show that, after adjusting for size, the overreaction effect almost disappears and any additional excess post-formation return to prior-losers is attributable to market cycles. This study implies that the presence of the overreaction effect in the UK stock market is time-varying and difficult to exploit in practice.
Keywords: Overreaction, Stock market efficiency, Small-size effect, Time-variation, Behavioral finance JEL Classification: G14, G32 Accepted Paper SeriesDate posted: January 18, 2012Suggested CitationContact Information
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