We explore how outcomes of optimal monetary policy with loose commitment (Schaumburg and Tambalotti, 2007; Debortoli and Nunes, 2010) can be observationally equivalent, or interpretable as outcomes of deeper optimal policy under sustainable plans (Chari and Kehoe, 1990). Both interpretations of...

We provide new insight on international monetary policy cooperation using a two-country model based on Benigno and Benigno (2006). Assuming symmetry, save for the volatility of (markup) shocks, we show that an incentive feasibility problem exists between the policymakers across national borders:...