Earlier quoted context omitted.
My Econ 101 understanding is that the value of USD is not primarily due to taxes, i.e. if the government stopped collecting taxes (or started forcing people to pay taxes in gold or Euros) the value of the dollar would not tank. Instead, we're in a Nash equilibrium where we're all accepting dollars as a means of exchange and it would be costly and have little benefit for individuals to defect. The intrinsic value of t…
You are talking about slightly different things. A lot of the reason why fiat money has value is obviously circular logic: You can use it to buy money at the store, because the store needs to pay its suppliers in the same currency, who needs to pay its employees in the same currency, who are happy (more or less) to work for the same currency because they can use it to buy the things that they need. The vast volume of…
But I disagree that you need taxation as a bootstrap to get you to the equilibrium. Indeed, in the actual history of the US it was the backing by gold that established the dollar; initial taxation was minimal. Now that backing has been removed, and the dollar still functions. Then, I infer, you would argue that taxation has replaced gold-backing as the stabilizer.
Your penultimate paragraph is an interesting suggestion, but I'm not convinced. Could you point me toward some place where it was fleshed out? I can easily imagine a world where people keep writing new contracts denominated in dollars, whose street value is set by the process that I described. Where is the motivation for people to defect? One answer is that a new currency (like Bitcoin) comes along that has special properties that make it useful enough for people to absorb transaction costs and to start exchanging alongside the original fiat currency. Then things could unravel. And indeed, taxation could suppress this by providing additional friction like I mentioned in my original comment. But in the absence of such a new currency I don't expect the dollar to spontaneously start to unravel on its own simply because there are no taxes. People would continue to need a medium of exchange and the dollar is very good.