Individual rationality and social norms: an economic analysis of morals

Relations between the rationality of the individual and the social norms is vital to the possibility of building a society of which that social norms be observed by almost every person. The paper studies on that whether it is possible that rational persons can cooperate each other by models of,static games and that of infinite repeated games, probes into what model we should select under certain circumstances, and makes a preliminary research on how can we build a moral society.