Public goods, group size, and provision aggregation
研究了群体规模如何影响公共品的私人供给，重点分析了不同聚合技术（即个人贡献如何决定总供给）的作用，发现聚合结构决定了群体规模对供给的影响，对政策干预有重要启示。
The paper examines the effects of group size on private provision of public goods, focusing on the influence of public good aggregator technologies through which individual contributions determine overall public good provision. We propose a general aggregator that encompasses existing aggregators, accommodates rivalrous public goods, and includes several interesting novel sub-aggregators. Our study of a wide range of aggregators indicates that the effects of group size on public good supply hinges on aggregator structures, thereby highlighting aggregators’ importance for the prognosis of policy intervention. The analysis here between aggregators and group size goes well beyond that of the extant literature. In the presence of income heterogeneity, the paper explores how an entrant affects public good provision for alternative aggregator technologies, which has important implications for income transfer policy of achieving Pareto-improving outcomes. An aggregative game approach greatly facilitates the depiction of group-size changes in equilibrium.