The facts of the Foxconn-events have revealed a vital problem: Is it necessary to appeal morality when there are struggles for raising salary? Marx's position on this question is so ambiguous that it could encompass entirely different interpretations. I contend that in all these interpretations there is a persistent lack of an adequate conception of ”exploitation.” Thus, this article attempts to solve this problem by examining the theories of Lukes, Kymlicka and Castoriadis in order to indicate the inadequacies of contemporary Marxist discourses. This article distinguishes the geometrical justice from arithmetical justice, and social justice from individual justice, so as to illustrate the dialectics of these elements. I contend that Marx's conception of justice would be clarified in this way.