Mandatory spending items will at some point soon crowd out all other spending. This comes at a time when, over the last 4 or 5 years, foreign creditors have stopped financing our deficit by buying ever growing quantities of US treasuries. So, for the first time in decades, US domestic private sector will be tasked with financing their own spending.
It is about to matter very soon, as baby boomers retire en masse. The endless talk of government spending leading to inflation didn't manifest (except in asset prices) because foreigners recycled their surpluses into treasuries. That this has mostly stopped will change the dynamic. The Fed will need to monetize the debt (resume QE) because there is simply too much treasury issuance, and growing, to be funded by US domestic sector alone, either in taxes or buying bonds.
If you look up last couple years US debt issuance has been bought up mostly by private sector, while central banks are buying gold. Recipe for it being the bond bull market peak and that debt being paid back in nominal but lower real terms = inflation. The only way to retire the massive and growing federal debt. Call it MMT or whatever you want, but it's coming. The loser will be the $.
[0] https://nationalinterest.org/blog/buzz/2025-us-interest-paym...