October 2025

The Evolution of Fairness: Evaluating Inequality Across Developmental Stages of Civilization

Author: Roland Y. Kim, Ph.D. Abstract Fairness is not a fixed moral principle but a developmental phenomenon rooted in emotional evolution. Building on de Waal’s (2003) findings of inequity aversion in primates and the Five-Stage Model of Civilization (Kim, 2021), this paper proposes a developmental framework for evaluating fairness across individuals, societies, and cultures. Each […]

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The Evolution of Fairness: Why Equality Means Different Things at Different Stages of Civilization

By Roland Y. Kim, Ph.D. In one of the most fascinating animal behavior studies ever filmed, primatologist Frans de Waal placed two capuchin monkeys side by side and asked them to perform a simple task: hand him a small rock in exchange for food. Both were content with cucumbers—until one monkey received a grape instead.

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