For more than a generation, the U.S. inflation-targeting framework has delivered impressive results. From 1995 to 2007, U.S. inflation averaged 2.1% (as measured by the Federal Reserve’s preferred index). Since 2008, average inflation dropped to only 1.5%, but expectations have fluctuated in a narrow range: for example, the market-based five-year, five-year forward (CPI) inflation expectation rarely dipped below 1.5% and never exceeded 3%.

However, the pandemic brought with it many dramatic changes. Fiscal and monetary policy mobilized, responding swiftly to the economic plunge with a combination of extraordinary debt-financed expenditure and balance sheet expansion. As a matter of accounting and arithmetic, these actions have had a profound impact on the balance sheets of banks and households, spurring dramatic growth in traditional monetary aggregates. From the end of February to the end of May 2020, broad money (M2) grew from $15.5 trillion to $17.9 trillion—a 16% jump in just three months.

Won’t the record 2020 gain in M2 be highly inflationary? We doubt it, and in this post we explain why. At the same time, we highlight the chronic uncertainty that plagues inflation. In our view, the difficulty in forecasting inflation makes it important that the Fed routinely communicate how it will react to inflation surprises—even when, as now, policymakers wish to promote extremely accommodative financial conditions….