Thinking in R instead of dollars
The Math of an Edge
One unit of risk
Professionals rarely say 'I made $400'. They say 'I made 2R'. R is one unit of risk — the amount you lose if the stop hits — and expressing everything in R makes results comparable across account sizes and position sizes. A 2R winner is a 2R winner whether you risked $50 or $5,000. It also removes the emotional pull of the dollar figure, which is the point: the number that makes you greedy or scared is the one in currency.