Group Formation through Indirect Reciprocity

TL;DR

This paper investigates how certain reciprocity norms can lead to the formation of two distinct groups in cooperative societies, using a game theoretical model to analyze stability conditions.

Contribution

It introduces a theoretical model demonstrating that specific reciprocity norms cause group splitting and identifies conditions for their evolutionary stability.

Findings

Reciprocity norms can induce group formation in cooperative societies.

Certain norms are evolutionarily stable under specific conditions.

The model links societal reciprocity norms to structural group dynamics.

Abstract

The emergence of structure in cooperative relation is studied in a game theoretical model. It is proved that specific types of reciprocity norm lead individuals to split into two groups. The condition for the evolutionary stability of the norms is also revealed. This result suggests a connection between group formation and a specific type of reciprocity norm in our society.