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What is evidence-based investing?
Nobody can establish who first used the phrase 'evidence-based investing', and no regulator defines it. Robin Powell, who was given the name by Larry Swedroe in 2015 and is sometimes wrongly credited with coining it, sets out what it actually means: four tests of what counts as evidence, borrowed from a medical parallel that hit the same crisis twelve years ago. Including where he goes further than a global tracker, and why he holds that position less firmly than he used to.
Robin Powell
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High active share funds are now the worst performers
Active share was meant to identify fund managers worth paying for. A new study covering four decades of US fund data finds that high active share funds now systematically underperform low active share funds. The reversal began in 2010 and coincides with the rise of passive investing creating structural pressure on active managers.
Robin Powell
Aug 175 min read
Why active funds underperform even when the manager picks well
The managers running the biggest active funds picked stocks that beat the market in 2025 — and most still lagged their benchmark. A Morningstar do-nothing experiment and a body of academic research explain why active funds underperform even when the picking is good: skilled buying undone by poor selling, the hidden cost of trading, and the incentives that keep managers churning. The UK evidence points the same way.
Robin Powell
Jun 87 min read
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