> So at some point they have to start cutting expenditure and paying that debt off.
They don't have to cut expenditures at all. Since the Fed controls rates, they can manage the debt by adjusting interest rates. There's nothing preventing them from driving interest rates below 0% and being paid to accept money. And the Fed can buy T-Bonds at below market rates and slowly destroy excess money in the economy in a controlled fashion.
Something to keep in mind is that US government debt is integral to the economy. It's a stable way for entities hold US dollars as cash, and it's the only mechanism for them to hold large sums of US dollars in cash.
It's fine (and expected) for US government debt to continue to increase forever, it's just a number in a spreadsheet. The only real risk is the potential for a default. But even then, if you have $4 trillion dollars, what are you going to do with it instead of buying t-bonds? Exchange it for Euros and risk the impacts of currency fluctuation? And what will the buyers do with those dollars? At some point, someone is going to want to bank those dollars in savings, and that means buying t-bonds (directly, or indirectly), and the risk of default merely becomes a factor in an equation for the holder.
You can do all this at an accounting level. But ultimately US government is buying things with debt, ie paying for goods and services from third parties with an IOU, and can only do it if people think they are getting a good deal.
The way you get shafted with debt is inflation. Barely a few years ago bond yields were around 0. If you lent money to the government then, you're already very behind because of inflation - you're not getting any interest, and by the time you are repaid, the money is worth far less than before.
Furthermore, the Fed can't really let interest rates diverge too much from inflation, since the mismatch drives inflation further. That's why the rates are around 4% now, even as the economy is slowing. They have to be up to contain inflation.
So then, as the election was playing out, you could see bond yields fluctuating in line with inflation expectation. Whenever Trump said something that sounded inflationary, like tarrifs, bond yields jumped up. That's not the Fed doing it, that's lenders demanding more interest from the US govt.
Now I agree the US can get away with this more than other places. They aren't far off Italian levels now, and that would be considered teetering around crisis levels. But it's fantasy to conclude the US can keep magicking money every year with no consequence.
They don't have to cut expenditures at all. Since the Fed controls rates, they can manage the debt by adjusting interest rates. There's nothing preventing them from driving interest rates below 0% and being paid to accept money. And the Fed can buy T-Bonds at below market rates and slowly destroy excess money in the economy in a controlled fashion.
Something to keep in mind is that US government debt is integral to the economy. It's a stable way for entities hold US dollars as cash, and it's the only mechanism for them to hold large sums of US dollars in cash.
It's fine (and expected) for US government debt to continue to increase forever, it's just a number in a spreadsheet. The only real risk is the potential for a default. But even then, if you have $4 trillion dollars, what are you going to do with it instead of buying t-bonds? Exchange it for Euros and risk the impacts of currency fluctuation? And what will the buyers do with those dollars? At some point, someone is going to want to bank those dollars in savings, and that means buying t-bonds (directly, or indirectly), and the risk of default merely becomes a factor in an equation for the holder.