[T]he great test [of history] has been decidedly against Marx and his theories of value and surplus value.
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Eugen von Böhm-Bawerk, Recent Literature on Interest (1903), London, MacMillan & Co, p. 126Karl Marx
[M]ost of Marx' theories which are not mistaken are meaningless. Marx remained influential, however: his influence never was based on the scientific truth-content of his theories but on their psychological appeal.
Karl Marx
The physiocrats started a train of thought which was a powerful stimulus to the development of a labour theory of value and surplus value.They did not, however develop such a theory of value themselves. What attention they gave to the problem of exchange-value and price produced results of an altogether different character. Thus while one of their contributions finds its continuation in Smith, Ricardo, and Marx, the other leads to the post-classical supply and demand and utility theories of value.
Eric Roll
All the sophisticated syllogisms of the ponderous volumes published by Marx, Engels, and hundreds of Marxian authors cannot conceal the fact that the only and ultimate source of Marx's prophecy is an alleged inspiration by virtue of which Marx claims to have guessed the plans of the mysterious powers determining the course of history. Like Hegel, Marx was a prophet communicating to the people the revelation that an inner voice had imparted to him.
Karl Marx
My objections to Marx are of two sorts: one, that he was muddle-headed; and the other, that his thinking was almost entirely inspired by hatred. The doctrine of surplus value, which is supposed to demonstrate the exploitation of wage-earners under capitalism, is arrived at: (a) by surreptitiously accepting Malthus's doctrine of population, which Marx and all his disciples explicitly repudiate; (b) by applying Ricardo's theory of value to wages, but not to the prices of manufactured articles. He is entirely satisfied with the result, not because it is in accordance with the facts or because it is logically coherent, but because it is calculated to rouse fury in wage-earners. Marx's doctrine that all historical events have been motivated by class conflicts is a rash and untrue extension to world history of certain features prominent in England and France a hundred years ago. His belief that there is a cosmic force called Dialectical Materialism which governs human history independently of human volitions, is mere mythology. His theoretical errors, however, would not have mattered so much but for the fact that, like Tertullian and Carlyle, his chief desire was to see his enemies punished, and he cared little what happened to his friends in the process.
Karl Marx
The two most far-reaching critical theories at the beginning of the latest phase of industrial society were those of Marx and Freud. Marx showed the moving powers and the conflicts in the social-historical process. Freud aimed at the critical uncovering of the inner conflicts. Both worked for the liberation of man, even though Marx’s concept was more comprehensive and less time-bound than Freud’s.
Erich Fromm
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