Modern Monetary Theory

Modern Monetary Theory or Modern Money Theory (MMT) is a heterodox macroeconomic theory concerning the role of fiscal and monetary policy in sovereign governments that borrow and issue government debt in their own currency. MMT synthesizes ideas from the state theory of money of Georg Friedrich Knapp (also known as chartalism) and the credit theory of money of Alfred Mitchell-Innes, the functional finance proposals of Abba Lerner, Hyman Minsky's views on the banking system and Wynne Godley's sectoral balances approach. Economists Warren Mosler, L. Randall Wray, Stephanie Kelton, Bill Mitchell and Pavlina R. Tcherneva are largely responsible for reviving the idea of chartalism as an explanation of money creation.

MMT frames government spending and taxation differently to most orthodox frameworks. MMT states that the government is the monopoly issuer of its currency and therefore must spend currency into existence before any tax revenue can be collected. The government spends currency into existence and taxpayers use that currency to pay their obligations to the state.

MMT argues that the primary risk once the economy reaches full employment is demand-pull inflation, which acts as the only constraint on spending. MMT also argues that inflation pressures can be mitigated by increasing taxes on everyone, to reduce the spending capacity of the private sector, releasing real resources such that the state can employ them at current prices in a non-inflationary way.^:150

The primary demand and inflation management approach advocated by most MMT economists is the job guarantee employer of last resort (ELR) programme. This provides a spend-side automatic fiscal stabilisation mechanism and establishes a nominal price anchor, utilising a buffer stock of employed labour. This is in contrast to the orthodox monetary dominance approach to demand management which involves adjusting interest rates and utilising a pool of unemployed labour as a buffer against inflationary pressures following a belief in a Phillip's curve trade off between the two.

MMT is opposed to the mainstream neoclassical macroeconomic frameworks and has been criticized by many mainstream economists. In a 2019 survey of top U.S. economists not a single respondent agreed with the basic aspects of MMT. MMT is also strongly opposed by members of the Austrian school of economics. MMT's applicability varies across countries depending on degree of monetary sovereignty, with contrasting implications for the United States versus Eurozone members or countries with currency substitution.