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
Even the most experienced investors aren’t immune to emotional influences. In fact, fear and overconfidence frequently cloud our investment decisions, often leading to poor outcomes. PAUL RICHARDS from Better Decisions explains that emotions evolved to keep us safe — but they don’t help much when it comes to modern investment decisions. Fear can drive us to sell at the wrong time, just as hope and greed might encourage excessive risk. The challenge is learning to spot when em
Robin Powell
May 19, 20254 min read
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