MMT wrong---assumes resource utilization and norms will control inflation.

MMT is at its weakest when addressing inflation, how it gets determined and how policies can control it. Its most common argument reduces to: inflation control is not a problem until it is. Problems arise when resource utilization reaches some limit, at which point higher taxes can keep inflation in check. But resource utilization is not the only factor that affects inflation. In late 2021, consumer price inflation hit a 40-year high of over 6%, yet compared to their pre-COVID levels, employment, capacity utilization, and industrial production are lower, while the unemployment rate is higher. Inflation is not rising because the overall economy has hit its resource limit. To be sure, supply-chain issues have driven up some prices relative to others, but these issues are not what anyone means by economy-wide resource limits. MMT’s weak theory of inflation is stunning because the potential of the MMT agenda to trigger inflation is the most frequently voiced criticism of the theory [Summers (2019), Cochrane (2020), Hartley (2020), Mankiw (2020)].

The guaranteed jobs program points to a more general theme of MMT: the federal government can solve big problems once policy makers grasp the key tenets of MMT. Kelton (2021) identifies seven “deficits,” defined in terms of both quantity and quality, that MMT can help to close: good jobs, saving, health care, education, infrastructure, climate, and democracy. MMT promises to address each of these deficiencies by first altering policy makers’ understandings of fiscal financing matters.

MMT abandons two long-standing policy norms. The first came from Alexander Hamilton in 1790 and can be summarized as “federal budget deficits beget budget surpluses,” meaning that debt-financed spending is backed by future taxes. This norm has contributed to less costly financing and bestowed on U.S. treasurys status as the world’s go-to safe and liquid assets, enabling their critical role in global financial markets. The second norm evolved from the 1951 Treasury-Fed Accord to make monetary policy operationally independent. Legislation houses countercyclical policy primarily in the Federal Reserve with the mandate that the Fed achieve price stability, maximum sustainable employment, and low long-term interest rates, and facilitate financial stability.

MMT instead posits that a dollar of new government debt need not carry any assurance of tax backing. It regards treasury securities solely as a means for the central bank to achieve its interest rate target. MMT shifts responsibility for achieving full employment and controlling inflation from monetary policy to fiscal policy. The central bank’s primary tasks are to serve as the Treasury’s bank and to maintain zero interest rates. Despite MMT claims to the contrary, monetary policy is completely subservient to fiscal policy, tossing aside Federal Reserve independence and the social benefits that accrue from it.

Full embrace of MMT’s policy proposals and new norms—whatever they may be—carries significant risks. Those risks include higher and more volatile inflation and interest rates and financial market instability, which would disrupt and depress real economic activity and harm most the people MMT aims to benefit.