Loss Aversion
What is Loss Aversion?
Loss aversion is the tendency to feel the pain of a loss more strongly than the pleasure of an equal-sized gain.
Roughly, losing $100 hurts about twice as much as gaining $100 feels good. It helps explain why people hold losing investments too long and are reluctant to take fair gambles. It is a core idea in prospect theory.
Loss Aversion: a worked example
Offer Jordan a coin flip: heads he wins $100, tails he loses $100. The expected value is 0.5 × $100 - 0.5 × $100 = $0, and most people decline flatly. Now sweeten the win to $220 while keeping the loss at $100. Expected value is 0.5 × $220 - 0.5 × $100 = $60, clearly positive. Weight the loss twice as heavily, as loss aversion suggests, and Jordan's felt value is 0.5 × $220 - 0.5 × (2 × $100) = $110 - $100 = $10. Barely positive, so he accepts, barely. The win had to more than double the loss to buy a yes.
The mistake students make with loss aversion
Loss aversion gets treated as another name for risk aversion, but the two are built differently. Risk aversion describes a dislike of spread in final wealth and applies the same way whichever direction the outcome runs. Loss aversion is measured from a reference point, so what counts as a loss depends on where the starting line is drawn. Redraw that line and the same gamble, with identical final balances, can flip from acceptable to refused. Plain risk aversion cannot produce that reversal.
Loss Aversion questions
What is the difference between loss aversion and risk aversion?
Loss aversion and risk aversion answer different questions. Risk aversion asks how much you dislike spread in outcomes and applies to gains and losses alike. Loss aversion asks where an outcome sits relative to a reference point, and it makes a loss weigh roughly twice a same-sized gain. The practical difference is that relabeling the starting point changes a loss-averse person's choice while leaving every final wealth figure untouched.
Why do people hold on to losing investments?
Investors hold losing positions because selling converts a paper loss into a realized one, and loss aversion makes that moment far more painful than the equivalent gain feels good. The purchase price becomes the reference point, so a stock bought at $50 and now worth $38 registers as a $12 loss rather than as a $38 asset. Behavioral finance calls the resulting pattern, selling winners early and riding losers down, the disposition effect.
Is loss aversion the same as the endowment effect?
Loss aversion and the endowment effect are linked but not identical. The endowment effect is the observed gap between what people demand to give something up and what they would pay to get it: a student who would not pay above $4 for a mug may refuse $9 to sell the same mug once it is hers. Loss aversion is the explanation offered for that gap, since giving up the mug is coded as a loss.
Related terms
Common comparisons
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