Discussions of methodology in economics, as in other fields, are likely to be tiresome and unrewarding. Nevertheless, to avoid the problem altogether… - Paul Sweezy

It must be emphasized, because the contrary has so often been asserted, that Marx was not trying to reduce everything to economic terms. He was rather attempting to uncover the true interrelation between the economic and the non-economic factors in the totality of social existence.

In possessing use value a commodity is in no way peculiar. Objects of human consumption in every age and in every form of society likewise possess use value. Use value is an expression of a certain relation between the consumer and the object consumed. Political economy, on the other hand, is a social science of the relations between people.

Most people take capitalism for granted, just as they take the solar system for granted. The eventual passing of capitalism, which is often conceded nowadays, is thought of in much the same way as the eventual cooling of the sun, that is to say, its relevance to contemporary events is denied.