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MMT suggests that governments are special economic entities worthy of their own 5th-dimension-like rules.

We say no, governments are faced with implied collateral requirements and leverage credibility restraints just
like anyone else. It is the wealth of the real economy that gives a government leverage, little different than the
leverageble and accessible wealth within a household or a business. The ability to write blank checks against
one's own IOUs is great, but not a qualifier for special treatment above and beyond other economic entities.

MMT glosses over the importance of productivity and prudent investment -
paying lip service to such, but then promoting contradictory assertions. Another MMT aphorism,
"the gold alchemist can never run out of gold," shows the deeply misguided psychology that MMT cultivates.
The United States government is not an "alchemist." It cannot conjure up gold. It can simply expand or
contract credit flows to good or ill consequences, depending on the soundness of its choices… and a successive
chain of ill choices can lead to disaster.

MMT does not fully account for the role that bad spending, unproductive debt build-up, and malinvestment
surges have in fueling Austrian style boom-bust cycles, which have been around for centuries (or even millennia).
The supernova model demonstrates these effects quite clearly.