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.
The fund industry warns that S&P 500 concentration makes your index fund dangerous. A major new study covering nearly a century of data tells a very different story — and suggests the real risk is listening to people who profit from your fear.
S&P 500 concentration risk is at historic highs. If you own a global tracker, your portfolio may be far less diversified than you think. Here's what you can do about it.
Robin Powell
Dec 19, 20252 min read
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