It’s less a revolutionary way to look at money, and more a revolutionary way to look at the government’s role in relation to money.
“Classical” theories like Keynesianism and Monetarism (those are still “modern” in the sense that they were created in the 1930 and 1970s, respectively) assume that money is external to the government: it is created and destroyed by the banking sector and the central bank, and the government handles it like any private business does: balancing income (from taxes) and expenditures (government wages, welfare, subsidies), taking out and repaying loans where they don’t balance. Basically the government is just a large non-profit organization subject to the same economic laws as everyone.
MMT argues that money is fundamentally a creation of governments (in fact, historically, heavily monetized economies usually exist within states with at least some amount of administrative apparatus that can collect taxes/tribute and pay government employees and soldiers). Therefore, governments should embrace that role and just create money out of the blue to pay for whatever needs to be done. Conversely, taxes aren’t used to cover expenditures, but instead to remove money from the economy (the government just destroys the money it collects as taxes) in order to control inflation.
While this is for sure an interesting way to look at it, fundamentally it doesn’t change the fact that in the long run (and assuming economic growth remains within some boundaries) government expenditures and taxes can’t just wildly diverge forever without creating inflation. The policy implications stay the same. MMT gained popularity in the wake of the 2008 banking crisis and following economic crisis because it allowed people to propose what Keynes would have called “deficit spending”, but without saying the name Keynes, hiding the fact that those proposals are based on a 70 years old theory that has been implemented with varying success, and analyzed (and challenged) in academic circles ever since.
Basically, the exactly same policy would be described by Keynes as “the government goes into debt in order to stimulate the economy during a crisis and later repays that debt by taxing the economy once the crisis is over” while MMT would describe it as “the government creates money to stimulate the economy during a crisis and later taxes the economy to reduce inflation once the crisis is over”.
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