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Casinos have the edge and still cap your bet. Here's why, and what it means for every trade you size. Should you ever size up a trade because you're sure you're right? Tom Sosnoff has traded for 45 years and made over a million trades, and he answers a viewer's question by comparing the four big position sizing systems: fixed fractional, the Kelly criterion, volatility-adjusted sizing, and the Martingale doubling strategy. He shares his exact numbers: buying power as a percentage of net liq for defined and undefined risk trades, daily theta targets, and how total exposure changes with IV rank. He also explains why seven straight losses can wipe out a Martingale trader, and why "genius fails when you trade too big."
#optionstrading #trading #positionsizing #riskmanagement #kellycriterion #tomsosnoff #lossdog
TIMESTAMPS
0:00 Should you size up on conviction?
0:39 What trading conviction really is
1:04 Fixed fractional position sizing
2:06 Kelly criterion pros and cons
3:04 Volatility-adjusted position sizing
4:02 Martingale: why doubling down fails
5:02 A hybrid sizing discipline
5:40 Exact buying power % by trade type
6:10 Proving concept before sizing up
6:17 How big is too big? 2x vs 10x
7:14 Why trading edges are so tiny
7:28 Why casinos cap your bet size
Position sizing decides more trading accounts than stock picking does, and it matters more now that retail traders have easy access to options, leveraged products, and short-dated contracts that can magnify a single oversized bet. The Kelly criterion has spread from professional gambling and quant funds into retail trading and sports betting, but it only works if you know your true edge, and in efficient markets almost nobody does. Strategies that "win often," like averaging down or doubling after a loss, can look great for months before one bad streak ends the account. The math behind trading small, trading often, and scaling risk to implied volatility is the same reason casinos win over time: lots of small bets add up, and survival is the real edge.
Casinos have the edge and still cap your bet. Here's why, and what it means for every trade you size. Should you ever size up a trade because you're sure you're right? Tom Sosnoff has traded for 45 years and made over a million trades, and he answers a viewer's question by comparing the four big position sizing systems: fixed fractional, the Kelly criterion, volatility-adjusted sizing, and the Martingale doubling strategy. He shares his exact numbers: buying power as a percentage of net liq for defined and undefined risk trades, daily theta targets, and how total exposure changes with IV rank. He also explains why seven straight losses can wipe out a Martingale trader, and why "genius fails when you trade too big."
#optionstrading #trading #positionsizing #riskmanagement #kellycriterion #tomsosnoff #lossdog
TIMESTAMPS
0:00 Should you size up on conviction?
0:39 What trading conviction really is
1:04 Fixed fractional position sizing
2:06 Kelly criterion pros and cons
3:04 Volatility-adjusted position sizing
4:02 Martingale: why doubling down fails
5:02 A hybrid sizing discipline
5:40 Exact buying power % by trade type
6:10 Proving concept before sizing up
6:17 How big is too big? 2x vs 10x
7:14 Why trading edges are so tiny
7:28 Why casinos cap your bet size
Position sizing decides more trading accounts than stock picking does, and it matters more now that retail traders have easy access to options, leveraged products, and short-dated contracts that can magnify a single oversized bet. The Kelly criterion has spread from professional gambling and quant funds into retail trading and sports betting, but it only works if you know your true edge, and in efficient markets almost nobody does. Strategies that "win often," like averaging down or doubling after a loss, can look great for months before one bad streak ends the account. The math behind trading small, trading often, and scaling risk to implied volatility is the same reason casinos win over time: lots of small bets add up, and survival is the real edge.
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