Warnings that index funds have broken the stock market all imply a threshold: a share of the market at which price discovery fails. Nobody making the argument names it. Owen Lamont, writing in the Financial Analysts Journal, argues that no such number exists short of complete passive ownership, and that what actually determines whether prices stay informative is who is left doing the trading. His case, the strongest peer-reviewed research against it, and what the performance
Fidelity's active funds built their reputation on Peter Lynch's legendary returns. But 30 years of data reveals zero funds with statistically significant outperformance. Most telling? Fidelity's own $723 billion bet on zero-fee index funds—bigger than its flagship active fund. When Peter Lynch's company stops backing Peter Lynch's strategy, the evidence speaks louder than marketing.
Robin Powell
Oct 25, 20259 min read
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