2 April 2026 · 1 min read
Position size is table arithmetic
We keep calculators on the Saturday tables on purpose. Size is not an identity. It is units that fit a named loss. When someone says they “usually risk a bit,” we ask them to write the bit as a number and to show the distance to invalidation. The room gets honest quickly.
The worksheet is short: account units you can actually access, a percentage you have already chosen as ordinary, the distance on the page, the resulting size. If the size is too small to feel exciting, that is often the point. Excitement is not a field on the sheet.
People who trade from phones tend to skip this page because the screen offers a default lot. In class we take the default away. You write the number. You check it twice. You do not round up because the idea “looks clean.”
Bring three ideas you already watch. Leave with three size cards. If you cannot name invalidation yet, skip this workshop and sit the cohort first. Arithmetic without a stop is just a larger problem.