Risk management: sizing, limits, and staying in the game
Same forecasts, same results. One sizing rule thrives, the other visits zero.
A confession about everything you’ve read so far: chapters 1 through 7 were about being right, and being right is the junior half of trading. The senior half is arranging your affairs so that being wrong (which will happen constantly, on schedule, per chapter 3) never removes you from the game.
Look at what that figure is not showing. Not two forecasters: one sequence of outcomes, a 55% hit rate either way. Not luck: the same results in the same order. The only difference between the calm line and the catastrophe is the fraction of the balance that rode on each position. Skill identical, outcomes identical, and one of these people quit in week three convinced the market was rigged.
The asymmetry that runs the whole show
Percentages lie to your intuition in one direction. Lose 20% and you need 25% to get home. Lose 50% and you need 100%. The ladder down is shorter than the ladder up at every rung, which is why the game’s first rule is not “win more” but never take the big fall. Small fixed fractions are how: risking a few percent of the balance per position means even the ugly streak (and a 55% trader will see six straight losses often enough to budget for it) dents the curve instead of ending it.
You cannot compound what you do not keep.
Limits are decisions made while sane
Every limit in trading is the same trick: moving a decision from the moment you’re worst equipped to make it to the moment you’re best equipped. Tuesday-you, calm, decides what a Saturday is allowed to cost. Saturday-you, three results deep and vibrating, merely obeys. Written down, before the first order, while none of it is emotional: the total amount whose loss changes nothing in your life, the per-position fraction, the stopping rule for the day. Then the hard part, which is all of it: obeying Tuesday.
This is also where honesty about scale belongs. Prediction-market contracts settle binary (100¢ or nothing), so variance is the loud kind. The arithmetic in this chapter describes survival for someone treating this as a priced entertainment with money they have fully written off. It is arithmetic, not advice: nothing in this book tells you what to do with your money, and chapter 9 says the quiet part in full.
Frequently asked questions
- How much of a balance do experienced traders risk on one position?
- The durable pattern across every trading discipline is small single-digit percentages of total balance per position, commonly a few percent, so that no single result, or realistic losing streak, can knock the trader out of the game. This is descriptive arithmetic about survival, not advice about your money.
- What is a drawdown and why does it matter so much?
- A drawdown is the fall from a balance's peak to its subsequent low. It matters because losses are asymmetric: a 50% fall needs a 100% climb just to get home. Oversized positions turn ordinary losing streaks, which probability guarantees will happen, into holes that arithmetic makes brutally hard to climb out of.
- What limits should someone set before trading a prediction market?
- Before the first trade, in writing: the total amount whose complete loss changes nothing about your life, a per-position fraction of it, and a stopping rule for the week. Decided calmly in advance, followed mechanically on Saturday. Decisions moved from the emotional moment to the rational one. If setting limits feels unnecessary, that is itself information.
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