Confirmation Bias in Investing, Explained With Data Examples
How investors cherry-pick information, what the numbers say about performance, and practical ways to reduce costly confirmation bias in real portfolios.
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Updated: Jul 5, 2026
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How investors cherry-pick information, what the numbers say about performance, and practical ways to reduce costly confirmation bias in real portfolios.
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A practical look at the psychology and incentives that make investors treat yesterday’s returns as tomorrow’s promise—and how to protect your decisions from the most common performance illusions.
A practical, equation-driven look at why mixing assets lowers portfolio volatility—through variance, covariance, correlation, and the geometry of efficient portfolios.
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