A cyclical network of indirect reciprocity is derived organizing 3- or 6-person groups intorings of social interaction where the first individual may help the second, the second the third,and so on until the last, who in turn may help the first. Mutual cooperation is triggered byassuming that what one person passes on to the next is multiplied by a factor of 3. Participantsplay repeatedly either in a partners or in a strangers condition and take their decisions firstsimultaneously and then sequentially. We find that pure indirect reciprocity enables mutualcooperation, although strategic considerations and group size are important too.
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