The fiction is that all debt is required for investment in the economy’s means of production. But banks monetize debt, and attach it to the economy’s means of production and anticipated future income streams. In other words, banks do not produce goods, services, and wealth, but claims on goods, services, and wealth — i.e., Soddy’s “virtual wealth.” In the process, bank credit bids up the price of such claims and privileges because these assets are worth however much banks are willing to lend against it.
To the extent that the FIRE sector accounts for the increase in GDP, this must be paid out of other GDP components. Trade in financial and real estate assets is a zero-sum (or even negative-sum) activity, comprised largely of speculation and extracting revenue, not producing “real” output. The long-term impact must be to increase debt-to-GDP ratios, and ultimately to stifle GDP growth as the financial bubble gives way to debt deflation, austerity, unemployment, defaults, and forfeitures. This is the sense in which today’s financial sector is subject to classical rent theory, distinguishing real wealth creation from mere overhead.