Model uncertainty and policy evaluation: Some theory and empirics

摘要

This paper explores ways to integrate model uncertainty into policy evaluation. We describe a general framework that includes both model averaging methods as well as some measures that describe whether policies and their consequences are model dependent. These general ideas are then applied to assess simple monetary policy rules for some standard New Keynesian specifications. We conclude that the original Taylor rule has good robustness properties, but may reasonably be challenged in overall qualitywith respect to stabilization by alternative simple rules, even when these rules employ parameters that are set without accounting for model uncertainty.