Stabilization with Fiscal Policy

I reconsider the long-standing consensus view that macroeconomic stabilization should rely on monetary policy, not fiscal policy. I use an analytically tractable heterogeneous agent New Keynesian (HANK) model that is parameterized so as to admit a bubble in public debt. In this context, I show that it is possible to stabilize either inflation or output in response to aggregate shocks by varying only fiscal policy (that is, lump-sum uniform transfers). In contrast, when the public debt bubble is large, it is impossible to stabilize either inflation or output by varying only interest rates (monetary policy).