If you need dollars, you can exchange your euros for dollars seconds before paying whatever. If the government had a problem with that, something drastic would

If you need dollars, you can exchange your euros for dollars seconds before paying whatever. If the government had a problem with that, something drastic would've changed. You can speculate that the US will deteriorate into a state where there will be currency controls and stuff, but in our lifetimes, it hasn't been like that. People say, or used to say, a lot, that oil being denominated in dollars meant something. I mean, that the choice of units has great economic value, somehow. But nobody's denying that you can exchange one currency for another at any time, right?