21 March 2026
Position size as an emotional decision
Sizing is taught as arithmetic. In practice it often reflects yesterday’s mood more than today’s risk.
Most technical plans include a percentage risk per trade. Most journals show that percentage drifting after wins and contracting after losses — sometimes the reverse. Both drifts are emotional, not mathematical.
We ask analysts to fix size the night before based on account equity and the plan’s stated risk, then refuse mid-day changes unless a hard stop-trading rule has been hit. Changing size because a setup "looks strong" is a psychology failure, not a technical upgrade.
The Drawdown Response Lab rehearses what happens when size was already too large and a streak begins. Procedure beats pep talk: reduce to a predefined floor, pause for a set number of sessions, then re-enter only at the floor size.
If your chart work is careful but your size wanders, psychology training belongs ahead of another pattern course.