"Marx's theory of forms of value systematically distinguishes his labor theory of value from the classical theory. Yet there remains even in Capital a sort of classical residue which prevents Marx's original theory of the form and the substance of value from being entirely consistent. Various confusions in the study of Marxian value theory, including the debates concerning the transformation problem, quite often originate from this classical residue in Marx. Let us not avoid facing the hidden root of such confusions, so that we can try to clear them away, and to complete Marx's value theory more systematically." (Einleitung)