Mechanism
Markets contain noise. Noise sometimes rewards bad entries, bad sizing, and bad discipline.
When bad behavior pays, you repeat it. Over time, the expected cost arrives: one day the same behavior fails catastrophically.
This is why pros grade decisions at entry against a plan, not against P&L.
Process upgrade: turn this truth into a rule you can actually enforce. If the rule can’t be enforced, it will be broken under stress.
- Write the trigger condition in observable terms.
- Write the action in one sentence.
- Write the penalty for breaking it.
How it kills accounts
Bad trade wins → confidence rises → repeat bad behavior → size increases → variance hits → large loss → emotional spiral.
How it kills accounts:
- The rule exists only in your head.
- Stress arrives and you improvise.
- Improvisation becomes inconsistency.
- Inconsistency becomes random results.
- Random results become a slow bleed.
Rule that survives
Grade trades by plan compliance, not by P&L.
Separate “good process, bad outcome” from “bad process, good outcome”.
Track rule breaks even when they make money.
Rule that survives:
- Write the trigger in observable terms.
- Write the action in one sentence.
- Write the penalty for breaking it.
Example archetype
You move your stop impulsively and the trade wins. You conclude it was ‘good management’. Next time it loses bigger. The market didn’t reward skill; it rewarded luck.
Tell: if your rule isn’t enforceable, it’s a suggestion. Suggestions don’t survive stress.
Deep dive
Process metrics
Track: plan adherence %, rule overrides, size changes, and whether exits match the original intent.
Related: Discretion is hidden leverage.
Glossary: outcome bias.
Field checklist
- Write the rule in observable terms: if X, then Y.
- Remove choices under stress. Choices become rationalizations.
- Track the precursor: what state were you in before the mistake?
- Make deviations costly (size down, pause, review).
- Turn lessons into gates, not notes.