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Scale Effects in Mutual Fund Performance: The Role of Trading CostsRoger M. EdelenUniversity of California, Davis - Graduate School of Management Richard B. EvansUniversity of Virginia - Darden School of Business Gregory B. KadlecVirginia Polytechnic Institute & State University - Pamplin College of Business March 17, 2007 Abstract: Berk and Green (2004) argue that investment inflow at high-performing mutual funds eliminates return persistence because fund managers face diminishing returns to scale. Our study examines the role of trading costs as a source of diseconomies of scale for mutual funds. We estimate annual trading costs for a large sample of equity funds and find that they are comparable in magnitude to the expense ratio; that they have higher cross-sectional variation that is related to fund trade size; and that they have an increasingly detrimental impact on performance as the fund's relative trade size increases. Moreover, relative trade size subsumes fund size in regressions of fund returns, which suggests that trading costs are the primary source of diseconomies of scale for funds.
Number of Pages in PDF File: 41 Keywords: Mutual Fund, Trading Costs, Size, Flow, Soft Dollars JEL Classification: G11, G20, G24 working papers seriesDate posted: December 13, 2006 ; Last revised: July 8, 2009Suggested CitationContact Information
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