[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.
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Ernest Van Den Haag, Reason Papers Vol. 26 (Summer 2000), pp. 39-62Karl 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
[Marx's theories] gave me a political and intellectual justification for what I believed in a way that nothing else did.
Neil Kinnock
[T]he great test [of history] has been decidedly against Marx and his theories of value and surplus value.
Karl Marx
An open society such as ours is based on the recognition that our understanding of reality is inherently imperfect. Nobody is in possession of the ultimate truth. As the philosopher Karl Popper has shown, the ultimate truth is not attainable even in science. All theories are subject to testing and the process of replacing old theories with better ones never ends.
George Soros
Marx's economic teachings are essentially a garbled rehash of the theories of Adam Smith and, first of all, of Ricardo.
Karl Marx
Marx, Karl
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