The present doctorate thesis aims to make a comparative study, inthe context of the theory of justice, involving the theory of complexequality, formulated by Michael Walzer, author inserted in the communitarians list, and the theory of justice as fairness, formulated byJohn Rawls, author inserted in the liberals list. It s about, therefore, acomparative study of authors based on the category of distributive justice,whose concept was originally formulated by the aristotelic thought. Thethesis - that contains elements of moral philosophy, political philosophyand philosophy of law - aims to verify if the theory of complex equality,with its particularistic methodology and its internal principles ofdistribution, makes possible, as well as Michael Walzer proclaims, thesocial criticism or if, on the other hand, this criticism has to be associated toan universalistic moral, as, for example, that one provided by the rawlsianmodel.