MMTers tend to back the permanent zero interest rate idea. E.g. Warren Mosler (and Matthew Forstater) wrote a paper entitled "The Natural Rate of Interest is Zero." Milton Friedman also said he couldn't see the point of interest-yielding government debt (see his para starting "Under the proposal..." Plus, I set out my ideas on this subject here.
As I explained in my above article, the basic argument against letting interest on state liabilities rise above zero is that full employment can perfectly well be achieved without any such interest rate rise. That is, to