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 SPIVA persistence scorecard has become a lightning rod for debate. Robin Wigglesworth shows how active managers’ critique collapses under scrutiny — and why persistence is the Achilles’ heel of their case.
Robin Powell
Sep 19, 20255 min read
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