“The real net rate of profit,” Shaikh writes, “is the central driver of accumulation, the material foundation around which the ‘animal spirits’ of capitalists frisk, with injections of net new purchasing power taking on a major role in the era of fiat money.” This sentence sums both the strengths and the basic flaw in Shaikh’s theory of crises, and without too much exaggeration the whole of his “Capitalism.”
By “net rate of profit,” Shaikh means the difference between the total profit (surplus value minus rent) and the rate of interest, divided by total advanced capital. This is absolutely correct.
In modern capitalism, as a practical matter the money that makes up net profit or profit as a whole consists of bank credit money convertible into state-issued legal-tender paper money that represents gold bullion. The fact that legal-tender paper money must represent gold bullion in circulation is an economic law, not a legal law. (More on this in next month’s post.) When Shaikh refers to real net profit, he does not refer to profit at all but rather to the portion of the surplus product that is purchased with the money that makes up the net profit.