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 fund industry says index concentration is the big risk. But the evidence points elsewhere. Compressed expected returns are what really threaten your long-term wealth — and the right response is simpler and cheaper than the industry would have you believe.
Robin Powell
Feb 279 min read
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