Nozick provide little scope for obligations to society.“But the lack of attention to social duty is somewhat surprising in theorists who propose more egalitarian principles of distribution. For example, John Rawls says that he is concerned with identifying the principles that assign “rights and duties in the basic institutions of society” and that define “the appropriate distribution of the benefits and burdens of social co-operation." But he says relatively little about duties and even less about the distribution of the burdens (as opposed to the benefits) of social cooperation. The difference principle seems only to affect the kinds of rights that will be permitted, not the kinds of duties that citizens