"No one serious is worried about American solvency. The paper says 50% over the next 10 years, but even most economists misunderstand how the monetary system works. There are so many other issues to worry about at the moment more immediate than solvency."
And the only point I was trying to make was this: Nobody expects an entire (powerful) system of government to stop being a thing ... until it stops. And other powerful governments have stopped being a thing.
I'm sure there were plenty of pundits in ancient Rome who said things like, "No one serious is worried about Roman solvency". And eventually, they were wrong.
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Side note: It doesn't matter if unserious people think these things or not. The article's premise is about the ideas of "too much debt" making the bond market a more risky bet.
If people aren't buying bonds this will eventually slow (and stop) cash flow to governments (including the federal government) to the point of it being a crisis, because bonds cover 25% of our Federal government spending.