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
Chasing last year’s top funds is seductive — and usually self-defeating. New evidence shows performance persistence is largely a mirage: most “winners” slip quickly, especially when markets get rough. Investors who keep costs low and own the market have far better odds of reaching their goals.
Robin Powell
Oct 20, 202511 min read
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