Field Journal · 21 July 2026

A Stop Belongs to the Thesis, Not Your Comfort

Why an invalidation point should come from chart structure before account risk determines position size.

Traders often reverse the order. They choose a familiar number of shares, notice the resulting loss is uncomfortable, and pull the stop closer. The stop now reflects emotion rather than the reason for entry.

Start with disproof

Write one sentence describing what price must do for the setup to remain valid. If a break beneath a confirmed swing low disproves a long thesis, mark that level and account for spread or gap behaviour. Only then measure the distance from the proposed entry.

The account-risk limit determines size: permitted cash risk divided by risk per unit. If the resulting size is impractical, pass on the trade. Moving the invalidation point to make the size larger changes the thesis.

Review the decision, not one result

A structurally sound stop can be hit before price reverses. One outcome does not prove the decision wrong. Review whether the level matched the pre-trade thesis and whether actual loss stayed within the written limit.