Masayoshi Muto Shibaura Institute of Technology   307 Fukasaku Minuma-ku Saitama, Saitama 337-8570 Japan   mmuto14@yahoo.co.jp         Primary Research Focus: social dilemmas, game theory, altruism, egalitarianism, social norms, trust, genesis of money, networks...   JEL Areas: D7 : Analysis of Collective Decision-Making: General D6 : Welfare Economics: General