Spread Is a Regime, Not a Constant

Spreads are not a fee you pay. They’re a state of the market.

In calm conditions, providers compete and the inside market is tight. In uncertainty, providers protect themselves: they widen, pull size, and refresh less. Your stop distance, target distance, and expected slippage all change with that.

If your edge is a few pips and the spread quietly doubles, the edge is gone even if your chart looks identical.

Practical framing: the market is a feedback system. Your job is to remove the behaviors that produce the same loss pattern, not to “feel better” about it.

• Turn recurring mistakes into hard gates.
• Reduce degrees of freedom when you’re losing.
• Make the next decision simpler than the last.

Spread widens → entries get worse → stops trigger sooner → you “tighten” to compensate → stop-out rate climbs → you chase to make it back → friction becomes the strategy.

How it kills accounts:

1. The rule exists only in your head.
2. Stress arrives and you improvise.
3. Improvisation becomes inconsistency.
4. Inconsistency becomes random results.
5. Random results become a slow bleed.

Size and stop distance must be conditional on spread and recent slippage.

If spread is above your “normal” band for that pair/session, either widen + reduce size, or don’t trade.

Never judge a strategy without logging spread at entry and at stop.

Rule that survives:

• Write the trigger in observable terms.
• Write the action in one sentence.
• Write the penalty for breaking it.

You scalp 3–5 pips on EURUSD during liquid hours. One week, the same setup “stops you out” repeatedly. The chart looks fine.

You check the tape: spreads are 1.2–1.8 pips instead of 0.4–0.6. Your stop was always inside the new spread noise. It wasn’t bad luck. You were trading a different market.

Tell: if your rule isn’t enforceable, it’s a suggestion. Suggestions don’t survive stress.

Quick test: Screenshot the spread at entry for your last 20 trades. Sort outcomes by spread quartile. You’ll usually find the “losing strategy” is just the high-spread regime.

Related: Commission Sets Your Minimum Holding Period.

Glossary: spread, adverse selection, liquidity vacuum.

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.