Thus the law of value becomes a low of motion for a definite type of social organization based upon the production of commodities… We are thereby led, in the most striking contrast to the outlook of the psychological school, to regard political economy as a part of sociology, and sociology itself as a historical science. Böhm-Bawerk has never become aware of this contrast of outlooks. The question whether the “subjectivist method” or the “objectivist method”... Thus it happens that Böhm-Bawerk, unfailingly carrying on the controversy from his subjectivist and psychological standpoint, discovers contradictions in the Marxist theory which seem to him to be contradictions solely because of his own subjectivist interpretation of the theory.
Rudolf Hilferding, Böhm-Bawerk’s Criticism of Marx, 1904, New York: Prism Key Press, 2011, p. 71.









