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MENTAL MODEL · M4229

Hamilton-Zuk Hypothesis

Hamilton-Zuk Hypothesis
BusinessHigh supportEconomics
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Updated 2026-08-08

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INTRODUCTION

English translation pending.

CORE DEFINITION

Proposed by William Hamilton and Marlene Zuk. Elaborate ornaments such as a peacock's tail are costly to produce and maintain, and their expression depends on the bearer's health. Because parasites impose continuous selection pressure, only individuals with strong resistance can afford full ornamentation, so the display reliably advertises low parasite load and good genes. The hypothesis explains why costly signals remain honest and why females rely on them in mate choice.

SCAFFOLDING EFFECT

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- Test signals: ask whether a display is expensive enough that weak competitors could not fake it - Read status markers: interpret costly credentials and philanthropy as signals of underlying capacity - Detect cheap talk: discount claims that cost the claimant nothing to make

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A signal stays honest only when producing it is costly and the cost falls as quality rises. Ornament expression depends on health, and health depends on parasite resistance, so only high-quality individuals can pay the full price. Cheap imitation is unstable, because fakers would flood the market until the signal lost value, which is why costly displays stay informative over evolutionary time.

MINIMUM ACTION

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Source support: Explicit

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