Luck versus Skill in the Cross-Section of Mutual Fund Returns
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What they found
Fama and French compared the actual distribution of alphas across 3,156 U.S. equity mutual funds from 1984 to 2006 with a bootstrapped distribution in which every fund has zero true alpha. Net of fees, the actual distribution looked worse than the zero-skill world: there were fewer funds with high alphas than luck alone would produce, and more with very negative ones. Gross of fees, the evidence was consistent with a small number of managers having enough skill to cover their costs, but not enough to benefit investors. Their conclusion is that the aggregate mutual fund industry does not add value net of fees and that identifying the few skilled managers in advance is nearly impossible.
What you can use
- Across thousands of professional managers with research staff and data, the net-of-fee results looked no better than a world where nobody has skill.
- A few managers likely have skill, but the number is small enough that picking them ahead of time is not realistic.
- This is the benchmark reality check for anyone who believes active trading is easy: the professionals collectively did not beat the market after costs.
Caveats
Mutual funds face constraints (size, mandates, liquidity) that individual traders do not. The bootstrap assumes the factor model is correct. Sample ends 2006.
Tags: professional, mutual-funds, skill, luck, bootstrap
Summaries are our own reading of the paper, not the authors' words. Educational only, not advice. Discuss it in Book Club.