In a first approximation, what back the currency is that it's accepted to buy things that are denominated in Dollars. But in a deeper sense, what back the curr

In a first approximation, what back the currency is that it's accepted to buy things that are denominated in Dollars. But in a deeper sense, what back the currency is that it's the only currency accepted by the USA government to pay taxes and other liabilities (1). If tomorrow, people decided they not want to use Dollars, they would still have to get Dollars in order to pay their taxes, that would grant demand for Dollars. (1) - https://neweconomicperspectives.org/2014/05/taxes-mmt-approach.html https://neweconomicperspectives.org/2014/05/taxes-mmt-approa...