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Comparative statics of altruism and spite

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  • Milchtaich, Igal
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    Abstract

    The equilibrium outcome of a strategic interaction may depend on the weight players place on other playersʼ payoffs or, more generally, on some social payoff that depends on everyoneʼs actions. A positive, negative or zero weight represents altruism, spite or complete selfishness, respectively. As it turns out, even in a symmetric interaction the equilibrium level of social payoff may be lower for a group of altruists than for selfish or spiteful groups. In particular, a concern for othersʼ payoffs may paradoxically lower these payoffs. However, this can only be so if the equilibrium strategies involved are unstable. If they are stable, the social payoff can only increase or remain unchanged with an increasing degree of altruism. In these results, ‘stability’ stands for a general notion of static stability, which includes a number of established ones, such as evolutionarily stable strategy, as special cases.

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    Bibliographic Info

    Article provided by Elsevier in its journal Games and Economic Behavior.

    Volume (Year): 75 (2012)
    Issue (Month): 2 ()
    Pages: 809-831

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    Handle: RePEc:eee:gamebe:v:75:y:2012:i:2:p:809-831

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    Web page: http://www.elsevier.com/locate/inca/622836

    Related research

    Keywords: Altruism; Selfishness; Comparative statics; Strategic games; Static stability;

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    References

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