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MENTAL MODEL · M0165

Green-beard Effect

Green-beard Effect
TechnicalHigh supportBiology
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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

If a gene can produce a conspicuous trait (a green beard) and cause its carriers to exhibit altruistic behavior toward other individuals possessing that trait, then the gene can spread rapidly in a population.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

Identify the biological roots of tribalism. It explains why subcultural groups, alumni associations, or certain cryptocurrency communities quickly establish trust and mutual aid through specific jargon or symbols. It is also a mechanism for group screening via signals.

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The green-beard effect: recognizing kin by a visible marker and favoring them, making limited altruism evolutionarily stable.

MINIMUM ACTION

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Green-beard_effectZH · Explicit
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