Loss aversion

Loss aversion is the tendency to feel a loss roughly twice as strongly as a gain of the same size. It makes traders hold losers and take profits too early.

How it works

The effect was described by psychologists Daniel Kahneman and Amos Tversky in prospect theory (1979). In experiments, people turned down a fair 50/50 bet until the possible win was about twice the possible loss. The exact ratio varies between studies and people.

In trading it shows up as the disposition effect: winners are closed quickly so the profit is not lost, while losers are held because closing makes the loss real. The result is small wins and big losses, and even a strategy with a high win rate can lose money.

The antidote is a stop-loss and target set in advance that you do not move on emotion, and thinking in R (units of risk): a −1R loss is the normal cost of a trade, not a personal failure.

Example with numbers

A trader wins 60% of trades, but the average win is $40 and the average loss is $90, because profits are cut early and losses are held. Over 10 trades: 6 × $40 − 4 × $90 = $240 − $360 = −$120. A high win rate did not save the account.

Common mistake

A common mistake is moving the stop further away to give the trade a chance. In reality that is loss aversion: you do not want to lock in the loss. Place the stop where the idea fails, size the position from it, and never move it in the direction of more loss. Move it only to reduce risk.

Questions and answers

What is loss aversion in simple terms?

It means losing $100 feels worse than winning $100 feels good. So we fear taking losses more than we should.

How does loss aversion affect trading?

Traders hold losing positions too long and close winners too early. Over time the losses outweigh the gains.

How do I stop being afraid of taking a loss?

Define your risk before entry, set a stop and think in units of risk. A small planned loss is part of the job, not a failure.

Loss aversion

How it works

Questions and answers

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