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
Investing at market highs often triggers fear and hesitation. Yet a century of market data shows that record peaks are a normal feature of long-term growth. This article explores three clear, evidence-based ways to approach investing at market highs without falling into paralysis.
Robin Powell
Oct 22, 202517 min read
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