What Room is Left for Monetary Policy?
Author InfoKevin X.D. Huang Qinglai Meng Abstract In sticky price models with endogenous investment, virtually all monetary policy rules that set a nominal interest rate in response solely to future in°ation induce real indeterminacy of equilibrium. Applying the Samuelson-Farebrother conditions, we obtain a necessary and suffcient condition for local real determinacy, which reveals that increasing price stickiness or letting policy respond also to current output may help ensure a unique equilibrium. We find that the first channel by itself has a quantitatively negligible effect and almost all strict inflation-targeting rules lead to indeterminacy, whether with higher price stickiness or overall stickiness by incorporating firm-specific capital, sticky wages, or both. The effect of the second avenue depends on labor supply elasticity and stickiness. With high labor supply elasticity and price stickiness, indeterminacy is much less likely to occur as policy also responds to output. With
