It's Not Whether You're Right — It's How Much

"You can be wrong half the time and still make a fortune if you cut losses quickly and let your winners run." — Stan Druckenmiller

Druckenmiller's long record rests on one principle that most investors accept in theory but struggle to follow in practice: returns are driven by the size of your wins relative to your losses, not by how often you are right.

That has two precise implications.

Position sizing is the primary skill. When conviction is genuinely high — the research is deep, the view differs from the crowd, and the risk-reward is skewed in your favour — you have to be willing to size the position meaningfully. A tiny position in your single best idea is not prudence; it is a failure of conviction. The flip side is that over-diversifying into dozens of half-hearted ideas dilutes the few that matter.

Cut losses without sentiment. The asymmetry only works if the downside is managed with equal discipline. When the reasoning behind a position turns out to be wrong — not merely when the price has fallen — exit promptly and fully. Holding a broken thesis in hope of a recovery is not patience; it is hope dressed up as analysis.

Illustrative example: the size was the decision

In one celebrated currency trade, the manager's conviction was expressed through an unusually large position — and the scale of that position, as much as the direction, determined the outcome. The lesson is that sizing, not just being right, drove the result.