Psychology · 9 MIN READ
Trading Psychology: Outcome Bias, Confirmation Bias, and Revenge Trading
Identify three common reasoning failures by recording decisions before results can rewrite the story.Outcome bias
Outcome bias judges a decision mainly by whether it won or lost. A disciplined trade can lose because markets are uncertain, while an impulsive trade can profit through luck.
Review the information available at decision time, the quality of the plan, and adherence to that plan before judging the process.
Confirmation bias
Confirmation bias gives extra weight to evidence that supports an existing view while dismissing invalidation. Write the disconfirming evidence before entry and require the same standard for bullish and bearish ideas.
Revenge trading
Revenge trading occurs when the objective shifts from executing a valid setup to recovering a recent loss or frustration. Warning signs include sudden size changes, lower setup quality, and unusually rapid re-entry.
A predefined daily loss limit, cooling-off period, and emotional check can interrupt the loop. Record the trigger without turning the note into self-criticism; the goal is a usable prevention rule.
Audit a winning rule-break honestly
After a loss, a trader immediately doubles size on a weaker setup and the second trade wins.
- Hide the result and evaluate whether the second setup met the written entry criteria.
- Compare size with the normal risk rule.
- Identify the trigger: urgency to recover the prior loss.
- Write a prevention rule, such as a timed pause after a full-risk loss.
The profit does not make the decision repeatable. The review protects the process by recording the rule break and the condition that triggered it.
Put the idea into your process
- Treating every emotion as a problem rather than focusing on behaviour.
- Calling a winner disciplined and a loser undisciplined by default.
- Writing self-critical notes without a prevention rule.
- Searching only for evidence that supports an open position.
- Record confidence and emotional state before entry using a simple scale.
- Write one piece of disconfirming evidence.
- Review decisions with the result temporarily hidden.
- Convert each repeated trigger into a specific interruption rule.
Prompts to use in your journal
- Would this decision still look sound if the outcome were reversed?
- What evidence contradicts the trade idea?
- Would I take this trade if the previous trade had not happened?
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