51 Pages Posted: 1 Sep 2013 Last revised: 1 Aug 2014
Date Written: July 30, 2014
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, though 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.
Keywords: returns to scale, mutual funds, active management, skill
JEL Classification: G10, G20
Suggested Citation: Suggested Citation
Pastor, Lubos and Stambaugh, Robert F. and Taylor, Lucian, Scale and Skill in Active Management (July 30, 2014). Available at SSRN: https://ssrn.com/abstract=2318788 or http://dx.doi.org/10.2139/ssrn.2318788
By Andrew Ang