What is more, in distinguishing between different types of capitalist activity–production, circulation, interest-bearing capital and rent–Marx offers the economist an additional diagnostic tool with which to examine the state of the economy. Is the sphere of circulation working well enough? Is there enough capacity to bring capital to the market, so that it can be exchanged and realize its value and be reinvested in production? What proportion of profits pays for interest, and is it the same for all capitalists? Do scarce resources, such as ‘intellectual’ ones like patents on inventions,
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