As others have noted, not only the government does get into debt, but private entities, too. What you describe as “classical physics” vs. “quantum physics” is to me more a question of which parts you sum up:

  • banks (central and private ones)
  • government
  • all the rest

If you create a group “banks + government + all the rest”, and then count all the debt of the banks as government debt, what you write is correct. But that looks really screwed. Looking at Switzerland, and creating two groups, one of “banks + all the rest” and another one “government”, the second one actually has no debt! And the government is only spending money it gets from taxes - crazy thought for most countries, I know…

So even if our government debt is at 0, there are a lot of CHF in circulation! Because the banks lend to “all the rest” for land purchase, housing, company needs, and others. This means that if the “bank” debt would be at 0, there would be no CHF. But this has nothing to do with the “government” debt, which is at 0 in Switzerland, if we exclude the “bank” debt.