Every dollar produced is loaned out at interest. Hence, every dollar produced is debt plus a certain percentage of debt based on that dollar. Since the banking system has a monopoly on the production of the currency and they loan each dollar out with an immediate debt attached to it, where does the money to pay for the debt come from? It can only come from the banks again. Which means that the banks have to perpetually increase their money supply to temporarily cover the outstanding debt created. Since, in turn, that money is loaned out as well it creates even more debt. The end result is that neither the government nor the public can ever come out from underneath it.
(paraphrased from the somewhat surrealistically critical film: “Zeitgeist: The Movie”)