On the mechanics of New-Keynesian models

The monetary transmission mechanism in New-Keynesian models is put to scrutiny. We show that, contrary to the conventional view, the transmission mechanism does not operate through the real interest rate channel. Instead, equilibrium inflation is approximately determined as in a flexible-price model; output is then pinned down by the New-Keynesian Phillips curve. The real rate only reflects the feasibility to keep consumption smooth when income changes. Contractionary monetary policy shocks reducing output and inflation are consistent with an increase, decline, or no change in the real rate. Consistency with the real rate channel is observational, not structural. (C) 2019 Elsevier B.V. All rights reserved.