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arXiv 1206.7119physics.soc-phcond-mat.stat-mechq-bio.PE
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广义收益函数对连续策略空间公共物品博弈中合作演化的影响

Impact of generalized benefit functions on the evolution of cooperation in spatial public goods games with continuous strategies

Xiaojie Chen, Attila Szolnoki, Matjaz Perc, Long Wang

摘要:

合作和背叛可以被认为是对社会困境的两种极端反应。然而,现实却远没有那么清晰。在这两个极端之间存在着一个矛盾选择的区间,理论上可以通过定义每个个体参与者对公共池的贡献程度的连续策略来捕捉。如果从单位区间中选择策略,其中0对应于纯背叛,1对应于最大贡献,问题是如果进化由不同的收益函数引导,那么个体对公共池的投资的特征水平是什么。在这里,我们考虑的陡峭度和阈值作为两个参数定义的一个数组的广义效益函数,我们表明,在一个结构化的人口存在的中间值,在这两个集体的贡献是最大的。然而,随着合作的成本效益比的增加,特征阈值降低,而相应的陡度增加。我们的观察仍然有效,如果使用更复杂的S形函数,从而加强了仔细调整的高水平的公共合作的好处的重要性。

英文摘要:

Cooperation and defection may be considered as two extreme responses to a social dilemma. Yet the reality is much less clear-cut. Between the two extremes lies an interval of ambivalent choices, which may be captured theoretically by means of continuous strategies defining the extent of the contributions of each individual player to the common pool. If strategies are chosen from the unit interval, where 0 corresponds to pure defection and 1 corresponds to the maximal contribution, the question is what is the characteristic level of individual investments to the common pool that emerges if the evolution is guided by different benefit functions. Here we consider the steepness and the threshold as two parameters defining an array of generalized benefit functions, and we show that in a structured population there exist intermediate values of both at which the collective contributions are maximal. However, as the cost-to-benefit ratio of cooperation increases the characteristic threshold decreases, while the corresponding steepness increases. Our observations remain valid if more complex sigmoid functions are used, thus reenforcing the importance of carefully adjusted benefits for high levels of public cooperation.

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