It’s all held together by a fragile belief system. Fiat currency has value because we believe it does. It’s best not to think about it too much and continue to consume. Like when Bush told us to go shopping after 9/11.
It is the tax system.
For every 1 buck they get 1.68 back. It is the velocity of that 1 buck that enriches the Treasury.
The Treasury must stay ahead of inflation.