Here is something that may help some to understand the difference between real debt and the ersatz debt of the United States government. Real Debt requires a non-trivial expenditure of time and energy to repay it. The ersatz debt of the United States, on the other hand, requires no significant expenditure of time and energy for "repayment". It has already been "covered" by printing of new money, before it is issued! It's not real debt; it is ersatz debt.
Of course the U.S. has the option of covering a deficit with real debt, but hasn't done this for many years. If the U.S. were to pay off deficit-associated Treasury securities (plus interest) with surplus revenue created by reducing spending or raising taxes, these Treasuries would represent real government debt. The net result would be a reduction in total private sector money*. Consideration of this explains why Wilson's Administration threw the nation into recession by using increased taxes to pay off WWI war bonds. Such is not the current practice however.
For decades, instead of covering deficits with real borrowing, we have covered deficits with newly "printed" money, followed by ersatz borrowing. Ersatz borrowing occurs when we routinely auction Treasury securities in an amount equal to deficits already covered by printing. In contrast to what happens in real borrowing, the net result is an increase in the total money in the private sector. Treasury securities issued in this latter case represent ersatz debt, not real debt, because the money to payoff the ersatz debt has already been printed and returns to the government when the associated Treasury securities are auctioned. As noted, the affect on the economy of real borrowing and acquisition of real debt is profoundly different than the effect of acquiring ersatz debt.**
We can summarize this. Whether real debt or ersatz debt is acquired has to do with how deficits and the associated Treasury securities are covered. If they are covered by future spending reductions and/or tax increases, the associated Treasuries represent real debt. If they are covered by printing, as is the current practice, the associated Treasuries represent ersatz debt.
It is standard practice to refer to outstanding Treasury securities as "debt". That's fine so long as one understands the difference between ersatz debt and real debt. Unfortunately few U.S. citizens, including most older Ph.D. economists, understand the difference. Neither, it seems, do most politicians. We need to change this because our own and our politicians' perception of government's money operations have a profound influence on our government's appropriation and spending.
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*To understand this discussion, we must treat Treasury securities the way MMT economists do, viz., as an interest paying alternative form of money.
**It follows, that in the case of ersatz debt being acquired, the purpose of auctioning Treasury securities cannot be to raise money. In fact, in an ersatz borrowing regime, Treasury securities play an entirely different role than the raising of money, as MMT economists are quick to point out.