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マツダ系列企業のセントラリティの時系列分析 A Time Series Analysis of Centrality in the Keiretsu of Mazda マツダケイレツ キギョウ ノ セントラリティ ノ ジケイレツ ブンセキ 50196101 坂本, 眞人 サカモト, マコト Sakamoto, Makoto 坂本 サカモト Sakamoto 眞人 マコト Makoto 宮崎大学 University of Miyazaki 伊藤, 孝夫 イトウ, タカオ 市村, 沙央里 イチムラ, サオリ Ito, Takao Ichimura, Saori keiretsu, transaction, cross shareholding, centrality, degree, betweenness In this paper we focus on the centrality issue of the keiretsu of Mazda. Mazda is one of the automobile makers in Japan. Like other automobile makers, Mazda organizes a suppliers' organization, called Yokokai. In order to understand the structure and its change in Yokokai, we collect the data of transactions and cross shareholdings in Yokokai from 1980 to 2005, and we calculate the centrality index from the viewpoints of degree, closeness, and betweenness. We identified the central companies of each year, and analyzed the time-series changes of the central companies in Yokokai. Therefore, this paper provides a comprehensive perspective of the empirical research of Keiretsu. 宮崎大学工学部 Faculty of Engineering, University of Miyazaki 2009-09-30 jpn departmental bulletin paper VoR http://hdl.handle.net/10458/2374 https://miyazaki-u.repo.nii.ac.jp/records/2892 AA00732558 05404924 宮崎大学工学部紀要 Memoirs of Faculty of Engineering, University of Miyazaki 38 13 29 https://miyazaki-u.repo.nii.ac.jp/record/2892/files/KJ00005628319.pdf application/pdf 7.1 MB 2020-06-21