Kelton’s essential argument, first advanced by MMT guru Warren Mosler in the 1990s, is quite simple: federal spending is unconstrained by revenue. Taxes function only to regulate demand and hence inflation; federal borrowing functions only to regulate interest rates. Sovereign government treasuries can create and spend as much money as they like to stimulate growth, especially when the economy is underperforming. If inflation spikes, taxes can be imposed to take money out of the economy.
https://mises.org/power-market/mmt-not-modern-not-monetary-not-theory
