Shintaro Miura Kanagawa University   3-27-1, Rokkakubashi, Kanagawa-ku Yokohama, Kanagawa 221-8686 Japan   smiura@kanagawa-u.ac.jp   http://smiura.web.fc2.com/Index.html           JEL Areas: C7 : Game Theory and Bargaining Theory:General D7 : Analysis of Collective Decision-Making: General