🧠 Psychology·intermediate

Loss Aversion

The psychological tendency to feel losses about twice as intensely as equivalent gains — drives bad exits and held losers.

Loss aversion is a well-documented cognitive bias: humans feel the pain of losing $100 about twice as intensely as the joy of winning $100. This evolutionary instinct made sense in the savanna (losing food was deadly; gaining extra food was just nice) but it's a disaster in trading. Loss aversion makes traders cut winners early ("lock in the gain before it disappears") and hold losers too long ("maybe it'll come back, then I won't have to feel the loss"). The result is the classic retail death spiral: small wins, big losses, negative expectancy even on systems that should be profitable. The fix is to mechanize exits. Pre-set your stop loss and take profit BEFORE the trade is open, then let the orders execute regardless of how you feel in the moment. Don't override exits with emotional decisions — that's exactly when loss aversion does the most damage.

Real trade example

Mark Douglas wrote in Trading in the Zone that loss aversion is the single biggest cause of retail trading failure — not bad strategies, but the inability to follow exits when emotions take over.

Related terms

Disposition Effect

intermediate

The tendency to sell winners too early and hold losers too long — the opposite of what profitable trading requires.

Sunk Cost Fallacy

beginner

Continuing a losing course of action because of resources already invested — driving traders to add to losers and refuse to cut losses.

Stop Loss

beginner

An order that automatically closes your trade at a predetermined loss level — your first line of survival.

Discipline

beginner

The ability to follow your trading plan exactly — without deviation — regardless of how you feel in the moment.

Tilt

beginner

The emotional state where you're trading from anger, fear, or frustration instead of your plan — the precursor to blowing up your account.

Endowment Effect

intermediate

The tendency to value something more highly just because you own it — drives traders to hold losing positions too long.

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