Your P&L Is Not You

A strategy with genuine edge can still lose money for weeks or months at a time, that's just what variance around a positive expected value looks like. Traders who tie their sense of competence directly to today's P&L tend to make their worst decisions exactly when the strategy is behaving normally but unluckily: they cut a sound position after a bad stretch, or double down out of frustration rather than analysis, both driven by treating the number on the screen as a judgment on themselves rather than a data point about the market.

The practical fix is separating two questions that feel like one: "is my process still sound?" and "how do I feel about today's number?" The first question is answered by checking the strategy against its known statistical properties, is the drawdown within the range history would predict, has anything about the underlying signal or market regime actually changed, while the second is a mood, not a diagnosis, and shouldn't drive position or process changes on its own. Keeping a written record of whether a loss came from the process failing versus the process working as expected (just unluckily) is a simple habit that keeps the two questions from blurring together in the moment.