Threshold-Level Public Goods Provision with Multiple Units: Experimental Effects of Disaggregated Groups with Rebates
实验比较了两种提供多单位公共品的机制：所有参与者组成一个大组提供两个单位，或分成两个小组各提供一个单位，发现分组方式平均贡献更高，而超额返还对聚合方式贡献提升作用更大。
We introduce two institutions that provide multiple public good units, assuming that a market-maker has the ability to establish groups of contributors. We set up an experiment where either all <i>N</i> individuals form one group to provide two units (aggregated approach), or divide the <i>N</i> participants into two groups, and each group provides one unit separately, with all individuals benefiting from any unit(s) provided (disaggregated approach). Our results show that the disaggregated approach produces higher contributions on average. We also find that the rebate of excess contributions has a larger influence in increasing contribution under the aggregated approach. <i></i>