A research team led by Professor Hitoshi Yamamoto (Rissho University, Japan) has developed a new model that integrates direct and indirect reciprocity, the two core mechanisms underpinning human cooperation. Unlike previous models that treat these processes separately, this study proposes a tolerant integrated reciprocity strategy that draws upon both personal experience and social reputation. The study’s results appeared in Scientific Reports on August 7, 2025.
Blending direct and indirect reciprocity: Researchers create tolerance-based cooperation framework
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