But this is only the beginning: If the US gets that $1 trillion debt, that money didn't just vanish. It gets spent in the economy, people consume things, stay employed etc., infrastructure gets developed and so on. ROI is usually there after only a few years: "Research [...] showed that one dollar of public money spent during the 2007-09 crisis could generate 2.5 dollars of output in five year’s time." https://theconversation.com/how-much-bang-for-a-buck-working...
So for every $100 the country borrows in the current climate, it only has to pay back a $37 in 50 years while getting returns of over $200 in 10 years.