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
The so-called stock-picker’s market is a myth that fund managers use to justify their fees, whatever the market does. Decades of data show that even when conditions should favour active managers, most still underperform. The evidence is clear: simplicity, not stock-picking, wins in the long run.
Robin Powell
Oct 23, 20259 min read
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