Whatever the influence of Mill may be, Marxian economics is still today attempting to explain highly complex orders of interaction in terms of single causal effects like mechanical phenomena rather than as prototypes of those self-ordering processes which give us access to the explanation of highly complex phenomena. It deserves mention however that, as Joachim Reig has pointed out (in his Introduction to the Spanish translation of E. von Bohm-Bawerk's essay on Marx's theory of exploitation (1976)), it would seem that after learning of the works of Jevons and Menger, Karl Marx himself completely abandoned further work on capital. If so, his followers were evidently not so wise as he.
Karl Marx