I didn't post this earlier because it appeared at Warren Mosler's here, where John Carney responded also in the comments.
However, I see from the comments here that not everyone who reads this blog picked it up over there.
Definitely a worthwhile read, especially if you are keeping track of how MMT is getting around.
Added plus, Carney calls out Krugman on a freshman error.
Hats off to John Carney for doing his part in helping to save the world. We desperately need more people with megaphones and bully pulpits explaining this.
How High Should Taxes Get on the Wealthy?