Trading Psychology · Lesson 7 · Beginner
Disposition Effect
You understand why you hold winners too short and losers too long, and you set up countermeasures.
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Loss Aversion
Losses hurt about twice as much as equal-sized gains feel good. This is partly biologically wired, which is why willpower rarely suffices. From it follows the disposition effect: selling winners too early, holding losers too long.
How a 1R loss ends up as 4R
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Decide by the rules.
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The key points at a glance
- Losses hurt about twice as much as equal-sized gains feel good.
- The disposition effect is the opposite of cut losses, let winners run.
- Fix your stop and take-profit before entry, think in R units.
Deep dive
How expensive is the disposition effect really?
In 1998 Odean analyzed around 10000 accounts and found a clear pattern: investors sell their winners more often than their losers, even though the opposite would be correct.
- The stocks that were sold outperformed the ones held by 3.2 to 3.4 percentage points per year
- Loss-aversion ratio typically 1.5 to 2.5: a loss hurts twice as much
- The reaction is faster than conscious thought, partly hardwired biologically
- Willpower is not enough, only mechanics rather than good intentions work reliably
The reset test: would you open this position again right now?
Ask yourself about every losing position you hold: would I enter exactly like this at the current price? Usually the answer is no. In that case you are only holding because of your entry, not because of the setup. The market does not know your entry.
The same applies in reverse on the winning side. In Market Wizards, Marcus calls his worst trade not a loss but a winner he sold too early: twelve limit-up days watched from the sidelines. Think in R, not in euros.
Why stops and targets come before the entry
You decide free of loss aversion only before you are in the market. After that, every tick colors your perception. Stop and take-profit belong in place as fixed numbers before the order goes out.
1R = your risk unit: the loss you planned per trade (distance from entry to stop-loss). +2R means: you won twice what you risked.
RRR (risk-reward ratio) = potential profit target divided by planned risk. 1:2 means: twice the reward against the risk.
Sources: Kahneman, Schwager, Elder, Goodman
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