Comic Strips

That makes for an interesting take to things, however it's simply an inverted way to think of paying for a debt incurred. Without the repayment by government revenue you would simply have acquisition by the government without a means to compensate for it.

The materials purchased have a cost. That cost is paid by the money created by the government. If the government simply continues to create an unbound supply of money then the currency becomes worthless and you end up with a hyper inflation cycle. See places like Zimbabwe or Venezuela where at some point you end up paying thousands of the sovereign currency for basic items. That currency volume needs to be maintained at some reasonable level for it to have any meaningful exchange value to another party.

So while it may not be directly input/output as the general population would see it, you could instead see it as a credit card. A limit is available on a card and to use it you must have available credit which is freed up by repayment of previous purchases.

Now, the fed through congress has the unique ability to extend their limit on demand, that still increases the debt load and associated interest payments, which is visible in the form of treasury bonds due and payable with accrued interest to the holder of those bonds. Those bonds are public debt, often held by foreign governments, but also by private sector investors, both which are assured payment by the credit worthiness of the government. This all is why there's such a fuss when talk of the government defaulting their debt comes about, the credit rating of the government, and why we have regular fights over extending that debt ceiling.