Mechanism
Wins create dopamine. Dopamine reduces caution. After a win, people feel skilled, so they increase size and loosen entry standards.
The market doesn’t care about your confidence cycle. Variance returns and punishes the bigger risk.
Many blowups happen right after a peak in confidence.
Psychology as mechanics: “discipline” is just a system with gates. If your rules are optional, you do not have rules, you have moods.
- Add friction: delay buttons, max trades, cooldown after loss.
- Make deviations expensive: if you break a rule, you reduce size next session.
- Track the precursor state: boredom, urgency, anger, FOMO.
How it kills accounts
Big win → size up → lower standards → normal loss hits → emotional response → double down → one bad day.
How it kills accounts:
- Emotion changes your rules.
- Rules become negotiable under stress.
- Decision frequency rises (overtrading).
- Quality drops, variance rises.
- The account pays for the mood swing.
Rule that survives
After a big win, reduce size automatically for N trades.
Lock your rules tighter after green streaks, not after losses.
Celebrate, then stop trading for the session.
Rule that survives:
- Add friction after losses: cooldown + max trades.
- If you negotiate rules mid-trade, you exit or reduce.
- Make deviations costly (next session reduced size).
Example archetype
You’re up big by lunch. You keep trading because you feel unstoppable. You give back half, then revenge trade to ‘get it back’. The day ends red. The enemy wasn’t the market; it was the win.
Tell: if you feel urgency, you’re late. Late trades pay twice: once in price, once in behavior.
Deep dive
Green-day rules
Most traders have red-day rules. The pros also have green-day rules.
Related: The one bad day problem.
Glossary: risk creep.
Field checklist
- If you feel urgency, you’re likely late. Late trades pay the spread twice: once in price, once in behavior.
- After a loss, add a cooldown. Your brain is now biased toward revenge sizing.
- If you’re negotiating rules mid-trade, you’re already off-plan.
- Use a checklist to prevent story-trading.
- Stop when your decision quality drops, not when your account hits zero.