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Title
Japanese: 
English:An Application of Coalition Power Analysis in Group Decision Based on the Blockability Index into Decision Support for Management in Shareholders Meeting 
Author
Japanese: 喜多村 正仁, 猪原 健弘.  
English: Masahito Kitamura, Takehiro Inohara.  
Language English 
Journal/Book name
Japanese: 
English:Proceedings of the 7th IEEE International Conference on Service Systems and Service Management 
Volume, Number, Page         pp. 7-12
Published date June 2010 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English:The 7th IEEE International Conference on Service Systems and Service Management 
Conference site
Japanese: 
English:Tokyo, Japan, June 2010 
Official URL http://www.rccm.tsinghua.edu.cn/ICSSSM10/
 
DOI https://doi.org/10.1109/ICSSSM.2010.5530278
Abstract This paper aims to provide an application of an analytical method for the analysis of coalition power in group decision situations based on the blockability index on simple games, and to present that the method gives effective information for decision makers to make appropriate decisions, taking a shareholders meeting in Japan as an example. In this paper, the voting situation in the 39th Fiscal Year Shareholders Meeting of Aderans Holdings, in which the Management and the largest shareholder Steel Partners Japan (SPJ) are in a serious conflict, is mathematically modeled as a six-player simple game in the framework of the theory of cooperative games, and each coalition's power is evaluated by the blockability index. The result indicates that SPJ by itself is so powerful that the Management should get many shareholders on its side to pass its proposals. More realistic analysis is made in which possible coalitions are restricted only to feasible ones, based on each shareholder's position toward the Management. It shows that the Management must get all the shareholders except SPJ and itself on its side to have more power than SPJ. These results indicating difficulty of the Management's winning to SPJ are consistent with the reality, in which the Management's proposal was voted down.

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