Scale and Skill in Active Management
May 26, 2014 Leave a comment
Scale and Skill in Active Management
Lubos Pastor
University of Chicago – Booth School of Business; Centre for Economic Policy Research (CEPR); National Bureau of Economic Research (NBER)
Robert F. Stambaugh
University of Pennsylvania – The Wharton School; National Bureau of Economic Research (NBER)
Lucian Taylor
University of Pennsylvania – The Wharton School
January 31, 2014
Abstract:
We empirically analyze the nature of returns to scale in active mutual fund management. We find strong evidence of decreasing returns at the industry level: As the size of the active mutual fund industry increases, a fund’s ability to outperform passive benchmarks declines. At the fund level, all methods considered indicate decreasing returns, but estimates that avoid econometric biases are insignificant. We also find that the active management industry has become more skilled over time. This upward trend in skill coincides with industry growth, which precludes the skill improvement from boosting fund performance. Finally, we find that performance deteriorates over a typical fund’s lifetime. This result can also be explained by industry-level decreasing returns to scale.
