The essential insight of Modern Monetary Theory is that sovereign, currency-issuing countries are only constrained by real limits. They are not constrained, and cannot be constrained, by purely financial limits because, as issuers of their respective fiat-currencies, they can never “run out of money.” This doesn’t mean that governments can spend without limit, or overspend without causing inflation, or that government should spend any sum unwisely. What it emphatically does mean is that no such sovereign government can be forced to tolerate mass unemployment because of the state of its finances – no matter what that state happens to be.
Virtually all economic commentary and punditry today, whether in America, Europe or most other places, is based on ideas about the monetary system which are not merely confused – they are starkly and comprehensively counter-factual.
Debt, Deficits, and Modern Monetary Theory: an interview of Bill Mitchell by Winston Gee of the Harvard International Review