Would tracking money growth have helped policymakers tighten sooner?
Core argument: The money growth surge beginning in 2020 and continuing into 2021 put upward pressure on inflation to a degree unprecedented in the post-1967 sample period, according to the graphs in Figure 3.
The graphs in Figure 3 show quite clearly how the surge in money growth starting in 2020 and continuing in 2021 put enormous upward pressure on inflation, to a degree unprecedented in the post-1967 sample period. And while the large and negative price gaps that followed in 2022 and 2023 are likewise indicative of strong disinflationary pressures applied through subsequent monetary tightening, one can’t see these graphs without asking: Had Federal Open Market Committee members been monitoring measures of money growth with the help of the P-star [price target based on monetary aggregates] model, might they have ended QE and raised interest rates sooner and more quickly, thereby avoiding at least some of the post-2020 inflation? Of course, massive fiscal expansion was another driver of the post-2020 surge in inflation, as suggested by fiscal theories of the price level. The model simply observes that regardless of its originating source, excessive money growth signals that inappropriate macroeconomic policies are fueling higher inflation. Fiscal expansions that expand money supply will be reflected in a P-star model.

