Mechanism
Traders place stops at round numbers, just beyond the wick, or “where it feels safe”. That’s emotion, not invalidation.
Obvious stop locations concentrate orders, making them more likely to be hit by normal volatility.
Proper stops are placed at invalidation, then size is adjusted to afford that distance.
Survival math: your account is a probability machine. Every extra unit of leverage increases the chance that a normal tail event becomes unrecoverable.
- Heat (total open risk) matters more than per-trade risk.
- When uncertainty rises, your risk budget should fall automatically.
- Plan exits for gaps, not only for smooth candles.
How it kills accounts
Comfort stop → normal noise tags → repeated small losses → frustration → widen stop without resizing → large loss → blow-up.
How it kills accounts:
- Small loss triggers a “fix-it” trade.
- Exposure creeps up across correlated positions.
- A routine streak arrives.
- Drawdown forces behavior change (revenge sizing / avoidance).
- One tail event finishes the job.
Rule that survives
Place stops at invalidation, not comfort.
If the required stop is too wide, reduce size or don’t take the trade.
Avoid obvious stop clusters unless your edge accounts for it.
Rule that survives:
- Cap total heat (open risk), not just per-trade risk.
- After drawdown, reduce size automatically.
- Plan the gap: size as if stops can slip.
Example archetype
You place your stop 1 pip below a round number because it feels ‘tight’. Price tags it in normal noise, then moves your way. You weren’t hunted. You were obvious.
Tell: if you “need” this trade to work to recover, your size is too large.
Deep dive
Invalidation-first thinking
Stop distance is not a preference. It’s a consequence of your thesis. If you can’t afford the invalidation distance, you can’t afford the trade.
Glossary: stop-loss, gap risk.
Field checklist
- Define max heat (total open risk). You can’t manage what you don’t cap.
- Keep a free-margin buffer that survives a normal shock and a bad fill.
- Scale down after drawdown. Your job is to stop the bleed, not to win it back.
- Treat correlated positions as one position.
- Plan the gap: what happens if price jumps through your stop?