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A well-established finding in behavioral economics: losing a given amount hurts psychologically far more than gaining the same amount feels good — and how that distorts investing decisions.
Kahneman and Tversky's research in the 1970s-80s showed that people experience a $1,000 loss as negative with far greater intensity than the pleasure from a $1,000 gain of the same size — a gap measured on average at roughly 2 to 2.5 times. This isn't a personal weakness; it's a consistent psychological pattern found repeatedly in research.
Loss aversion causes investors to hold losing stocks far longer than makes business sense ("I won't sell at a loss, I'll wait for it to come back") and to sell winning stocks too early ("I'll lock in the gain before it disappears") — exactly the opposite of what sound investing discipline recommends.
The signal checks stocks that have dropped meaningfully over a medium-term window (around three months) and flags situations where the holding pattern may be driven more by psychological difficulty selling at a loss than by a fresh business reassessment. It doesn't say 'sell' — it flags a pattern worth examining consciously.
The question that neutralizes the bias: "If I didn't already hold this stock, would I buy it today, at the current price, given what I know now?" If the answer is no, that's a sign the holding is continuing because of the entry price, not because of an up-to-date business thesis.
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The information in this guide is intended for general educational purposes only and does not constitute investment advice. Full details on the disclaimer page.