In a series of recent writings, John Roemer has made a provocative claim: exploitation and class are merely second-order concepts within Marxian theory, because both phenomena derive directly from differential ownership of productive assets ; indeed, exploitation remains a consistent index of economic injustice only if a “property relations” conception of exploitation replaces the common “labor-value” view. In sum, property relations, not the labor exchange, the labor proces, labor values, or even capitalist accumlation should bethecentral concern of Marxian theory.