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How much passive investing is too much?
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

Robin Powell
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Are you as good at investing as you think?
Overconfidence is one of the most common behavioural traps in investing. Just as most people think they’re better-than-average drivers, many assume they’re skilled investors but the numbers suggest otherwise. CONSTANTINOS ANTONIOU from Warwick Business School says this kind of overconfidence leads to poor decision-making, particularly in investing, where people tend to overreact to news or act on unreliable signals. Trading on rumour, reacting too quickly, or thinking you can

Robin Powell
Feb 24, 20254 min read


Does your fund manager punch walls?
People often think that fund managers are immune to the emotions that afflict ordinary investors, but they aren't.

Robin Powell
Feb 14, 20255 min read
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