A trader opens a $50,000 account. Confident in a setup, they risk 10% — $5,000 — on a single trade. It loses. Then the next one. Five consecutive losses later, they're down $25,000 and need a 100% return just to break even. That's not a rough patch. That's an account on life support.
The 1% rule is mechanical, not motivational. Risk no more than 1% of total account equity on any single trade. On a $50,000 account, that's $500 maximum loss per trade. Position size is then calculated backwards from that figure — stop distance determines how many units you trade, never the other way around.
The maths on consecutive losses is brutal and worth staring at directly. Ten straight losers at 1% per trade produces a 9.6% drawdown. The same losing streak at 5% per trade produces a 40.1% drawdown. Recovery from 9.6% requires a 10.6% gain. Recovery from 40.1% requires a 67.1% gain. The asymmetry is not subtle.
The Turtle Traders — Richard Dennis's famous experiment in systematic trading — used fixed fractional position sizing precisely because it scales exposure to account size automatically. A shrinking account produces smaller positions. A growing account scales up proportionally. The rule self-adjusts without emotional input. Traders wanting to build on this can study position sizing methodology, the mechanics of Turtle trading systems, and the foundational concept of drawdown and recovery maths to understand why the percentages compound so viciously in both directions.
Survival is the prerequisite for everything else in trading. You cannot participate in the next opportunity if a previous trade has eliminated your capital.
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