Conflict of social norms: Bushido versus Shonindo in an indirect reciprocity game

Tadashu Matsuo
(Ritsumeikan University)

2013/3/12, 14:30- at Room 3631 (6th floor of building 3 of the Faculty of Sciences)

Our model investigates conflict between different social norms in the simplest setting. We assume three types, Bushido, Shonindo and AllD. Former two obey same kind of reputation labeling called Kandori and same kind of action principle called Disk. But Bushido regards outsiders as enemy, whilst Shonindo seeks cooperation with good outsiders. AllD is an action principle defecting all opponents. We studied replicator dynamics among these three types. Then we confirmed that the coexistence of the three types is not possible and eventually one type dominates the population. And owing to the conflict between the two norms, AllD can spread. And owing to the conflict between the two norms, there arises the possibility that AllD can spread, contrary to the ordinary single norm model.

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