Economist here. You should really keep in mind that the same GDP must go both towards paying off the national debt and paying off household debt. Also you should track commodities (at the very least, the ratio between put & call options).
If you mean Mark To Market, yes. It you mean anything else (and I am wracking my brains trying to come up with another relevant meaning for that acronym), no.
I think he is talking about Modern Monetary Theory, where one of the conclusions they arrive, after studying how modern economies work, is that private sector debt grow when there is not enough government deficit.
