Not that long ago, Modern Monetary Theory made it into the news, as a component of the Green New Deal proposed by some of the new progressives in Congress. My knowledge of it is limited. My understanding of it is limited to the idea that nations with fiat currency and the ability to issue bonds should print whatever money is necessary to fund the government, and taxes and bond issuance should only be used to control inflation. What are the advantages and disadvantages of this idea? Is this an idea that is fringe or is it gaining support among mainstream economists? Is it a model that is sustainable in the long term?