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Dylan Matthews — Modern Monetary Theory, explained—A very detailed walkthrough of the big new left economic idea.

Summary:
Modern Monetary Theory is having a moment. The theory, in brief, argues that countries that issue their own currencies can never “run out of money” the way people or businesses can. But what was once an obscure “heterodox” branch of economics has now become a major topic of debate among Democrats and economists with astonishing speed.For that, we can thank Rep. Alexandria Ocasio-Cortez (D-NY), who told Business Insider in January that MMT “absolutely” needs to be “a larger part of our conversation.” That was the most vocal mainstream support MMT had gotten, which for years had been championed by economists like Stephanie Kelton (a former adviser to Bernie Sanders), L. Randall Wray, Bill Mitchell (who coined the name Modern Monetary Theory), and Warren Mosler — as well as a growing

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Modern Monetary Theory is having a moment.
The theory, in brief, argues that countries that issue their own currencies can never “run out of money” the way people or businesses can. But what was once an obscure “heterodox” branch of economics has now become a major topic of debate among Democrats and economists with astonishing speed.

For that, we can thank Rep. Alexandria Ocasio-Cortez (D-NY), who told Business Insider in January that MMT “absolutely” needs to be “a larger part of our conversation.” That was the most vocal mainstream support MMT had gotten, which for years had been championed by economists like Stephanie Kelton (a former adviser to Bernie Sanders), L. Randall Wray, Bill Mitchell (who coined the name Modern Monetary Theory), and Warren Mosler — as well as a growing number of economists at Wall Street institutions.
With AOC on board, a wave of denunciations from mainstream economists and others followed. Fed Chair Jerome Powell, Bill Gates, former Treasury Secretary Larry Summers, and former IMF chief economist Kenneth Rogoff all attacked the theory.
Or, more accurately, they attacked what they thought the theory to be. MMT is more nuanced than the “governments never have to pay for stuff” caricature it’s earned among other economists, and MMT advocates are famously (and often understandably) ornery when they sense they’re being misrepresented.
At the same, that caricature gets at what may ultimately be the most important effect of MMT as an idea: It could convince some Democrats to break away from the view that spending always has to be “paid for” with tax increases. How many Democrats buy that conclusion, and how far they’re willing to take it, remains to be seen. But some are already moving in that direction: While emphasizing that “debt matters,” Sen. Elizabeth Warren (D-MA) recently noted, “we need to rethink our system in a way that is genuinely about investments that pay off over time.”
The rise of MMT could allow Democrats to embrace the de facto fiscal policy of Republican presidents, who tend to explode the deficit to finance pet initiatives like tax cuts and defense spending, leaving Democrats to clean up afterward. MMT could be Democrats’ way of saying, “We don’t want to be suckers anymore.”

That would be a big deal. Getting comfortable with new deficit-financed programs would help Democrats overcome the single biggest impediment to their agenda: raising taxes to fund their programs. MMT could offer a way to justify passing big priorities like single-payer health care or free college without resorting to major middle-class tax hikes.
And if the idea behind MMT is wrong, that shift could be a false promise, one that offers short-term political benefits at the expense of hard to foresee economic costs.
So let’s dive into the wonky details of MMT. And I do mean wonky — this is a pretty technical article that gets into the nitty-gritty of why MMT is different from mainstream economics. But I think those details are important, and they’re easy for even very smart, very informed people to get wrong....
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Modern Monetary Theory, explained—A very detailed walkthrough of the big new left economic idea.
Dylan Matthews
Mike Norman
Mike Norman is an economist and veteran trader whose career has spanned over 30 years on Wall Street. He is a former member and trader on the CME, NYMEX, COMEX and NYFE and he managed money for one of the largest hedge funds and ran a prop trading desk for Credit Suisse.

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