Sizing for the bad year

After this lesson you'll set every risk parameter for the worst stretch your method produces — because you'll be holding maximum exposure when it arrives.

The timing of bad stretches

This school ends on its most sobering arithmetic, and it starts with a mechanism. Ask when a trend-following book is at maximum exposure. It's after a long stretch of the method working: the ladder (course 3) fully climbed, heat at the ceiling, several themes pressed, confidence earned and high. Now ask when trend methods have their worst stretches. It's when a long-running regime breaks, which by construction comes after the long stretch of the method working. The exposure peak and the vulnerability peak sit in the same place on the calendar.

That's the argument for a rule that sounds paranoid until you've traded through one cycle: every parameter in this school (R, the heat ceiling, the theme caps, the drawdown thresholds) is sized for the bad year. Good years forgive any settings at all. The audit comes in the bad one, which arrives precisely when your settings are at their most aggressive and your recent evidence says they're fine.

The compounding view

Run School II course 1's table at account scale across years. Take a method that makes +25% in good years and loses 40% in its bad year, against one making +15% and losing 12%. The first pair shrinks the account: 1.25 × 0.60 = 0.75 of starting capital per good-bad cycle. Even two good years for every bad one still lose money there, at 1.25 × 1.25 × 0.60 ≈ 0.94. The second pair compounds steadily through the damage, at 1.15 × 1.15 × 0.88 ≈ 1.16 per cycle. Their entries could be identical; what separates the two is the size of the worst year, and over a decade that one property dominates everything this Academy has taught about entries.

The practical translations each point at a dial from earlier courses. Set R at 1% rather than 2% while your worst-stretch data is thin, and your first campaigns are the thin-data period (School VIII will formalize this). Price the heat ceiling against the correlated-day scenario from course 5, which is the bad year's opening move. Write a drawdown protocol (course 4) whose final threshold you would genuinely honor, since that threshold is the boundary between a bad year and a terminal one. And obey the regime gauges (School IV) especially when obedience is expensive, because standing down near a top always looks wrong at the time, and the bad year begins near a top by definition.

None of this caps your good years as much as intuition claims. The ladder still climbs and winners still run on their trailed stops. The cap lands on the one year that would otherwise end the compounding.

Check yourself

1. Why do maximum exposure and maximum vulnerability coincide? (Exposure peaks after sustained success; trend methods break when long regimes break, which follows sustained success. So the two peaks land in the same place on the calendar.)
2. Trader A: +25%/−40% cycle. Trader B: +15%/+15%/−12%. Who compounds, and what single property decides it? (B — the smaller worst year. A's cycle multiplies to 0.75; B's to ~1.16.)
3. Which dial from this school most directly shrinks the bad year, and why? (The drawdown protocol's hard floor — it converts an open-ended loss into a bounded one, which is the whole difference between A and B.)

The habit this school installs

Set every dial for the worst stretch, because it arrives when you're most exposed.

This completes School VI. Next: School VII — The Mind, where the trader becomes the subject.