@piezoe says that the US does not have debt. So either
he is wrong, or the
above chart is wrong. It cannot be both.
So which is true and correct?
We have no word to describe what the treasury is doing when they appear to be borrowing due to deficit spending. What they are actually doing is not borrowing but exchanging new money created, and already spent into the economy, for Treasury securities. When they do this, the money comes out of bank reserve accounts and goes right back to the Treasury. But the money does not disappear from the private sector economy. It just changes its form into that of an interest paying, Treasury security.
You and I can't do this sort of money transaction, but if we had our own money machine we might do a roughly equivalent sort of thing. Say, we wanted to buy a car for $35,000. We would go into our basement where we keep our money machine and print out $35,000. We would buy the car. Now we have the car and the car dealer has our newly printed $35,000. Then we would sell a bond with a face value of $35,000. (We would only do this if we wanted to mimic what the government does.) Now we have both the car and the $35,000 we printed, and we are obligated to give the $35,000 back to the bond purchaser, with interest, sometime in the future. When the bond matures, the bond purchaser ends up with $35,000 that we printed and we still have the car. We did create a future liability for ourselves when we sold the bond, but since, in that process, we got our 35K$ back, we could buy the bond back at any time we like and strike a match to it. The net result is we printed $35,000 and bought a car. You can see, that net, there is really no borrowing going on; only printing and buying. We will get the interest we paid the dealer by printing that too, or if we prefer, just stealing the money we need for the interest payment from our neighbor (our equivalent of taxation).
One of the remarkable things that the MMT economists realized is that the U.S. always money finances its purchases and then only
later appears to be borrowing when the Treasury sells securities in an equivalent amount. In other words we always buy first, and then appear to borrow. This raises a perfectly good question. If the Treasury does not have to borrow, why do they sell securities? The answer is that issue and sale of Treasury securities has nothing to do with the need to raise money. Instead, Treasury securities are essential tools of the Central bank used to control the aggregate amount of money in reserve accounts and also serve the private sector as an interest paying, zero risk store of money. (There is of course inflation risk, but there is no risk of default unless artificially created.)
The only way new money, i.e., money that remains in the private sector until, and unless, it is taxed back out, gets into the private sector in the first place is via deficit spending. Once this new money gets into the economy, at can be converted to Treasury Securities. Regardless of its form, this is what economists call "outside" or "base" money. Deficits are essential when the amount of "outside" money in the private sector must be increased. By far the biggest component of what we call the money supply is, however, not outside money but rather what economists call "inside" or "credit" money. This kind of money is impermanent. It appears when a bank makes a loan and disappears when the loan is paid off.
Once a person understands "outside" money, they will have no problem realizing that what we refer to as the "national debt" is simply the accumulation of deficits. Even a well run economy, if it grows, will necessarily have an accumulating deficit, one that continues to accumulate as long as the economy continues to grow. Both the mean rate at which deficits accumulate and what money is spent for are important factors.
The idea of taxing to reduce a deficit that has grown too rapidly relative to GDP is not without merit, but taxing too much out of an economy too rapidly will cause a recession and possibly damaging deflation. That occurred after the First World War when Wilson wanted to promptly pay back the War debt.
Wouldn't it be nice if someone who understood these things could be appointed head of CBO? I always get the feeling when listening to our budget offices heads that they haven't a clue how our money works or where it comes from.