Step Returns in Threshold Public Goods: A Meta- and Experimental Analysis
提出门槛公共品中的步进回报概念，通过元分析和实验发现，步进回报越高，自愿贡献越多，类似于线性公共品中的边际人均回报效应。
Abstract One important determinant of voluntary contributions to public goods is the value of the public good relative to that of the forgone private good. Isaac, Walker and Thomas (1984) formalized this relation in the Marginal Per Capita Return (MPCR) and demonstrated its influence on the provision of linear public goods. This paper develops a parallel concept, in the context of a threshold public good, the Step Return (SR). After providing a meta-analysis of the effect of SR in previous experiments, we compare contributions in threshold public goods games with low, medium and high SRs. Results show that subjects respond to the SR in this setting just as they respond to the MPCR in the linear public goods setting: higher SRs lead to more contributions.