I really hate trying to push analogies, but it is so easy to get sucked in. I look at it this way.
Suppose our only interest in planet calculations is to predict the location of the planets as seen from earth. Both P and C have methods for that. They are both “good enough for gov’t work”.
The P method takes more calculations, so we should prefer C. But, suppose we have people who are ready and able to do the P calculations while nobody is stepping up to use C. Therefore, we use P.
So, my story on MMT and inflation goes like this. I recall reading something before covid from an MMT proponent. They said that the real limit on gov’t spending isn’t taxes, but inflation. We can run deficits as long as inflation in okay. If inflation gets too high, simply change fiscal policy and get it under control.
I’m sure I recall the word “simply” in the article I read. That’s because I thought you’ve got to be politically naïve to think that raising taxes or cutting spending is “simple”.
After covid we get inflation. I remember posting (probably here) that the best theoretical gov’t response would be a surtax on FIT with matching changes to withholding. That would rapidly take money out of the economy. We could fine tune the amount in real time.
Raising interest rates was the poorer choice. It’s slower, therefore harder to adjust. Also, I thought the distributional effects of the tax approach were “less bad” than the distributional effects of interest.
But, I didn’t see any MMT proponent step up and say they had the better mousetrap, there was deafening silence from their camp. (If they had said something, it wouldn’t have mattered because the political reality was that tax increases were off the table.)
So, I don’t see MMT helping with inflation today. Until that changes, we are stuck with interest rates. MMT may help with the financial equivalent of the space program, but that’s a different topic.