Most traders think risk management means stop losses. It actually means bet size — and there's a 70-year-old formula that explains why.
The Kelly criterion asks one question: given your edge and your odds, what fraction of your capital maximizes long-run growth?
The uncomfortable part: Kelly assumes you know your true edge. In crypto, nobody does. Your backtested win rate is a guess. Your edge might just be a bull market wearing a costume. And Kelly is unforgiving — bet with an edge you don't actually have, and the math guarantees ruin.
This is why serious quants run fractional Kelly: half or a quarter of the calculated size. The growth cost of undersizing is small. The ruin cost of oversizing is total. That asymmetry is everything.
Crypto makes it worse in two ways:
1. Fat tails. Real returns have shoulders the normal distribution never sees. Positions sized for ordinary weeks get liquidated in abnormal ones.
2. Correlation spikes. In a crash, majors and alts converge toward the same trade — ten positions can secretly be one oversized bet.
Practical translation: if you can't state why you have an edge and what would prove you wrong, your Kelly fraction isn't 25%. It's closer to zero. And the moment you feel completely certain is usually the moment to cut size, not double it.
Bet small enough to survive being wrong. Let compounding do the rest.
$BTC $ETH $SOL
#RiskManagement #PositionSizing #KellyCriterion #CryptoTrading #TradingPsychology
The Kelly criterion asks one question: given your edge and your odds, what fraction of your capital maximizes long-run growth?
The uncomfortable part: Kelly assumes you know your true edge. In crypto, nobody does. Your backtested win rate is a guess. Your edge might just be a bull market wearing a costume. And Kelly is unforgiving — bet with an edge you don't actually have, and the math guarantees ruin.
This is why serious quants run fractional Kelly: half or a quarter of the calculated size. The growth cost of undersizing is small. The ruin cost of oversizing is total. That asymmetry is everything.
Crypto makes it worse in two ways:
1. Fat tails. Real returns have shoulders the normal distribution never sees. Positions sized for ordinary weeks get liquidated in abnormal ones.
2. Correlation spikes. In a crash, majors and alts converge toward the same trade — ten positions can secretly be one oversized bet.
Practical translation: if you can't state why you have an edge and what would prove you wrong, your Kelly fraction isn't 25%. It's closer to zero. And the moment you feel completely certain is usually the moment to cut size, not double it.
Bet small enough to survive being wrong. Let compounding do the rest.
$BTC $ETH $SOL
#RiskManagement #PositionSizing #KellyCriterion #CryptoTrading #TradingPsychology