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
Terry Smith blames index funds for Fundsmith's five-year slump — but international market data, factor analysis, and 2024's high-dispersion conditions tell a different story. Here's what the evidence actually shows.
Robin Powell
Jan 156 min read
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