The Coleman–Shapley index: being decisive within the coalition of the interested

The Coleman–Shapley index: being decisive within the coalition of the interested
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科尔曼沙普利指数:在利益相关者联盟中具有决定性作用

DOI:
10.1007/s11127-019-00654-y
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发表时间:
2019
期刊:
影响因子:
1.6
通讯作者:
Huettner
Huettner
中科院分区:
经济学3区
文献类型:
--
作者:
Casajus;André;Huettner

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集体行动的科尔曼权力(CPCA)是一个流行的统计数据,反映了委员会通过提案的能力。应用Shapley值的措施,我们得出一个新的权力指数科尔曼Shapley指数(CSI),表明每个选民的贡献CPCA。CSI的特征在于四个公理:匿名性,无效选民属性,转移属性,以及规定选民权力之和等于CPCA的属性。与Shapley-Shubik指数(SSI)和Penrose-Banzhaf指数(PBI)类似,我们的新指数反映了成为关键选民的期望。在这里,CPCA和PBI背后的联盟形成模型与SSI背后的排序方法相结合。与SSI不同的是,选民的排序不是根据他们对潜在法案的同意程度,而是根据他们在该法案中的既得利益,在最感兴趣的选民中,权力的衡量方式与PBI相似。虽然我们提倡CSI而不是PBI,以捕捉选民对提案是否通过的影响,但我们的指数赋予了PBI新的含义。CSI是PBI的分解者,通过威胁阻止任何提案,将PBI分解为选民的权力和选民对其他选民权力的影响。我们将我们的指数应用于欧盟理事会和联合国安全理事会。
The Coleman power of a collectivity to act (CPCA) is a popular statistic that reflects the ability of a committee to pass a proposal. Applying the Shapley value to that measure, we derive a new power index—the Coleman–Shapley index (CSI)—indicating each voter’s contribution to the CPCA. The CSI is characterized by four axioms: anonymity, the null voter property, the transfer property, and a property stipulating that the sum of the voters’ power equals the CPCA. Similar to the Shapley–Shubik index (SSI) and the Penrose–Banzhaf index (PBI), our new index reflects the expectation of being a pivotal voter. Here, the coalitional formation model underlying the CPCA and the PBI is combined with the ordering approach underlying the SSI. In contrast to the SSI, voters are ordered not according to their agreement with a potential bill, but according to their vested interest in it. Among the most interested voters, power is then measured in a way similar to the PBI. Although we advocate the CSI over the PBI so as to capture a voter’s influence on whether a proposal passes, our index gives new meaning to the PBI. The CSI is a decomposer of the PBI, splitting the PBI into a voter’s power as such and the voter’s impact on the power of the other voters by threatening to block any proposal. We apply our index to the EU Council and the UN Security Council.
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