Marx's theory of social class is founded on the idea of conflict of interest defined by the property system. Marx puts the point this way in the Communist Manifesto: “History is a history of class conflict.” And his inference from this fact: “Workers of the world, unite; you have nothing to lose but your chains” (Marx and Engels 1848). Individuals belong to classes depending on their position within the social property system. The social property system defines the access and use ...