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Indirect Reciprocity with Contagious Reputation in Large-Scale Small-World Networks

Markus Neumann ()
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Markus Neumann: https://markusneumann.github.io/

Journal of Artificial Societies and Social Simulation, 2020, vol. 23, issue 4, 2

Abstract: The question of why acts of selflessness occur in a Hobbesian self-help world has fascinated scholars for decades, if not centuries. Utilizing simulations, previous research has shown that altruism can be evolutionarily stable in small-scale societies under a narrow set of circumstances. However, when expanding such models to populations of anything larger than a few hundred people, they generally break down. In this paper, I modify the widely used image-score mechanism to include contagion-based reputation and demonstrate how altruism can survive in populations of up to 20,000. I also find that selflessness strongly depends on network topology - as heavily clustered small-world societies that resemble tight-knit family or friendship structures promote more cooperation than random networks where connections are more superficial.

Keywords: Altruism; Evolution; Network; Simulation; Small-World (search for similar items in EconPapers)
Date: 2020-10-31
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Persistent link: https://EconPapers.repec.org/RePEc:jas:jasssj:2019-77-3

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