Materialismo histórico

Murray Rothbard explica: "... There is no place in his system where Marx is fuzzier or shakier than at its base: the concept of historical materialism, the key to the inevitable dialectic of history.
At the base of historical materialism and of Marx's view of history is the concept of the "material productive forces." These "forces" are the driving power that creates all historical events and changes. So what are these "material productive forces"? This is never made clear. The best that can be said is that material productive forces mean "technological methods." On the other hand, we are also faced with the term "mode of production," which seems to be the same thing as material productive forces, or the sum of, or systems of, technological methods...."
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