Selling a winner delivers a guaranteed pleasure: the profit becomes real, and you were “right.” Selling a loser delivers a guaranteed pain: the loss becomes real, and you were “wrong.” Because losses weigh roughly twice as much as gains, the mind engineers exits to harvest the pleasure early and postpone the pain indefinitely — regardless of what the chart says. The result over hundreds of trades is a portfolio of small locked-in wins and a graveyard of large open losses.
- Truncated right tail. The few large winners that pay for a strategy’s many small losses get cut at +0.5R instead of running to +3R.
- Fattened left tail. Losers held “until breakeven” quietly grow into the account’s biggest drawdowns.
- Inverted expectancy. A strategy that is profitable on paper becomes losing in practice purely through biased exits — the setup was never the problem.
Define both exits with the entry. Stop and target written before the position exists — exits decided when you are neutral, executed when you are not.
Judge exits against the plan, not the P&L. In review, an early exit from a winner is scored as an error even when it made money — otherwise the bias keeps getting rewarded.
Use mechanical partials. If holding full size to target is unbearable, pre-commit a partial at +1R and let the runner work — structure absorbing what willpower cannot.
Track your exit asymmetry. A journal column comparing average winner-hold-time vs loser-hold-time makes the invisible bias a visible number — and numbers can be trained.
The emotional root — why profits feel unbearable to hold — is explored in fear and cutting winners short.