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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

William Morris, CFA, Head of Investments, Weatherbys Private Bank

Explanation-based investing: a better name than passive?

In this guest post, William Morris introduces the idea of explanation-based investing as a fresh alternative to the often-misunderstood term “passive investing.” He argues that what investors really need isn’t to be active or passive, but to understand the reasoning behind their choices. Clear explanations, grounded in evidence, can help people make better decisions and achieve stronger long-term outcomes.

Robin Powell

Sep 17, 20255 min read

The hidden costs of passive investing: how significant are they?

The hidden costs of passive investing can add hundreds of basis points annually beyond headline fees. New research reveals how index funds face invisible expenses from rebalancing friction, tracking errors, and market impact that never appear on fund fact sheets. UK investors may pay far more than the advertised 0.1% management charge.

TEBI

Jul 14, 202511 min read

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