Simiao Li Hokkaido University, Graduate School of Economics and Business Administration, Sapporo, Japan   1-8-512 Room Kita-13, Nishi-4 Kita-ku Sapporo, Hokkaido 001-0013 Japan   ms.simiaoli@yahoo.com             JEL Areas: D7 : Analysis of Collective Decision-Making: General C7 : Game Theory and Bargaining Theory:General