The rule that sounds boring and keeps you alive
Risk roughly one percent of your capital on any single position. That is the whole rule, and to a beginner it sounds painfully slow — why grind one percent at a time when you could bet ten? The answer is that the goal is not to grow fast on your best day, it is to still be in the game after your worst week. Small position sizes are what make that survival possible.
Why small sizes survive
At one percent per position, even a brutal run of ten straight losses barely dents your capital, leaving you calm and fully able to keep executing your edge. At ten percent per position, that same run is catastrophic — and worse, it triggers the panic and chasing that turn a drawdown into a wipeout. Small sizing does not just limit losses; it protects the clear head you need to keep making good decisions.
The asymmetry of losses
Losses hurt more than equivalent gains help, because of how percentages compound. Lose 50% and you need a 100% gain just to recover; lose 10% and you need only about 11%. Keeping each position small keeps your drawdowns in the shallow zone where recovery is easy, instead of the deep zone where the math quietly works against you for months.
Slow is the point
Treating one percent as too slow misunderstands the game. Compounding a real edge over hundreds of small, survivable positions beats swinging big and busting out before your edge ever had time to show. The investors who are still here in five years are almost never the ones who bet big early — they are the ones who refused to.