Actually, you know what? I have a better reply, so I deleted my old one. Because I checked three separate sources just to be absolutely, 100% sure, that you were being pedantic. And moreover, it turns out you're wrong.

Do you know what currency I use? Euros. Now, are Euros a sovereign currency in southern Europe?

The answer is a resounding no, followed by a guttural guffaw from our many unemployed people.

And what happens in such a case? What happens when I pay taxes? Is this done through your method described, or is it perhaps through hmm... what was my phrasing again? More direct means?

You don't have to answer that. I found the answer thrice.

And why exactly is it that MMT is "how it works now?"

Is it an immutable law of science? Is it like gravity and light and relativity? Or is it because a bunch of arrogant cowboys parked their behinds on a nuclear inventory measuring at some 6000 warheads?

Is it because it doesn't work, or is it because whenever a country attempts to develop an independent currency model, they get a strongly worded letter from IMF warning them about sanctions?

Is it because the US, and the European Union has been involved in a decades long effort to control the currency exchange rate in literally every nation on the planet through self-serving and coercive treaties and trade deals with nations who were given an offer they couldn't refuse?

These are all rhetorical questions mind you, because I did not spend several years of my life learning how to speak English just to talk to pedants.

Have a good day and leave me alone.