The counterpoint is Japan, which has 280% debt-to-GDP ratios (about double the US), and is still selling government bonds at 0% interest rates. I'm not saying

The counterpoint is Japan, which has 280% debt-to-GDP ratios (about double the US), and is still selling government bonds at 0% interest rates. I'm not saying demand is infinite, but it very well could be significantly higher than the current supply. In particular older demographics tend to heavily favor low interest rates and high money supplies. Old people tend to have high savings, and are risk-averse enough that they'll park it in liquid sovereign bonds even at negative real yields. And the continuing aging of American and world demographics isn't changing for the next century.