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 investment factor reveals a counterintuitive truth: companies that spend aggressively on growth tend to deliver lower returns than their cautious peers. With Big Tech pouring hundreds of billions into AI infrastructure, six decades of academic evidence suggest investors should be sceptical.
Robin Powell
Jan 208 min read
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