MENTAL MODEL · M1121

Proportionality Bias

Learn & MetacognitionHigh supportCognitive Psychology

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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

People tend to assume that big events must have big causes. For example, the assassination of a president (a big event) is necessarily a huge conspiracy (a big cause), rather than the act of a lone madman (a small cause).

SCAFFOLDING EFFECT

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Reduce cognitive load

Overcoming conspiratorial thinking. The world is chaotic; a tiny butterfly's wing can trigger a storm. Acknowledging that "big events may have trivial causes" helps us analyze disasters and accidents more objectively.

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The human brain tends to assume that causes and effects match in "scale": the more significant the consequence, the more "equally significant" the antecedent must be to explain it. This is the result of the combined effect of the availability heuristic and conspiratorial thinking—the situation where a small perturbation in a chaotic system is amplified into a catastrophe is difficult for intuition to accept.

MINIMUM ACTION

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Practice this model in one real situation:

When encountering a major event, first list all possible causes, regardless of their scale
evaluate the strength of the actual causal chain between each cause and the outcome
deliberately retain the possibility of "small cause, big effect"
use probability and evidence rather than "intuitive scale" to judge the primary cause.

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Source support: Explicit

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en.wikipedia.orghttps://en.wikipedia.org/wiki/Proportionality_biasZH · Explicit
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