arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0907.2638physics.soc-ph
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群体规模不变的公共产品博弈中的伙伴选择

Partner selections in public goods games with constant group size

Te Wu, Feng Fu, Long Wang

摘要:

以往关于公共物品博弈的研究大多假设参与是无条件的,或者竞争群体中实际参与者的数量随时间而变化。由社会制度规定的固定群体规模如何影响合作的演变仍不清楚。我们提出了一个模型,在这个模型中,具有异质社会关系的个人可能会参与不同数量的公共产品游戏,但在进化过程中,每个公共产品游戏的规模是恒定的。要做到这一点,我们假设每个焦点个人单向选择一个常数的互动伙伴从他的近邻与概率成正比的程度或这些邻居的声誉,相应的度为基础的合作伙伴选择或基于声誉的合作伙伴选择,分别。由于群的随机性,群的形成是动态的。在这两个选择制度,单调依赖的固定密度的合作者的组大小被发现,前者在整个范围内,但后者在一个有限的范围内的重整化增强因子。此外,基于声誉的制度可以大大改善合作。为了解释这些差异,个体的微观特征进行了探讨。后来,我们扩展度为基础的合作伙伴选择一般情况下,焦点个人的偏好对他们的邻居不同的社会关系,形成群体。作为比较,我们还研究了度正则图上的个体随机选择合作者的情况。我们的研究结果可能会提供一些见解,以更好地理解在现实世界中广泛的团队合作和合作。

英文摘要:

Most of previous studies concerning the Public Goods Game assume either participation is unconditional or the number of actual participants in a competitive group changes over time. How the fixed group size, prescribed by social institutions, affects the evolution of cooperation is still unclear. We propose a model where individuals with heterogeneous social ties might well engage in differing numbers of Public Goods Games, yet with each Public Goods Game being constant size during the course of evolution. To do this, we assume that each focal individual unidirectionally selects a constant number of interaction partners from his immediate neighbors with probabilities proportional to the degrees or the reputations of these neighbors, corresponding to degree-based partner selection or reputation-based partner selection, respectively. Because of the stochasticity the group formation is dynamical. In both selection regimes, monotonical dependence of the stationary density of cooperators on the group size was found, the former over the whole range but the latter over a restricted range of the renormalized enhancement factor. Moreover, the reputation-based regime can substantially improve cooperation. To interpret these differences, the microscopic characteristics of individuals are probed. We later extend the degree-based partner selection to general cases where focal individuals have preferences towards their neighbors of varying social ties to form groups. As a comparison, we as well investigate the situation where individuals locating on the degree regular graphs choose their co-players at random. Our results may give some insights into better understanding the widespread teamwork and cooperation in the real world.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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