By Marxist economics we mean the work of those later economists who based their methodology and approach on the work of Karl Marx. Excluded from discussion here is the enormous body of exegetical literature seeking to amplify the genesis of and development of Marx's own thinking (Rosdolsky, 1968). Before discussing three areas where the contribution of Marxists has been most striking and important, it is helpful to bear in mind certain features of their approach which could be said to separate them off from other traditions in economic theory.