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 World Cup is a genuine, enormous attention shock — Wikipedia traffic spikes eightfold during the final. Yet a new working paper finds the World Cup stock market effect barely registers in the deep, global markets that carry most of the world's money, and shows how two ordinary ways of measuring it can conjure the effect out of nothing. Where the distraction does bite is among retail investors trading on the noise — the people the original studies never quite looked at.
Robin Powell
Jun 258 min read
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