Keith, again, with respect, this is like a religious dogma. When one applies logic to it, it makes no sense.

Germany tried this system. It killed the German economy. It is the theory of a 19th century economist who thought tha the European government created money in order to control people. Knapp did not believe that money evolved to replace barter.

Constantly repeating the above does not make it true. It's like all the religious people that keep repeating that Jesus was born of a virgin, and eventually they believe it to be true and they cannot see that it doesn't make sense.

The entire MMT is completel bullarkey.