Inflation contract, central bank transparency and model uncertainty

Using a New-Keynesian model subject to misspecifications, we examine how the robust monetary policy could be modified by a linear inflation contract when a central bank is opaque about its preference for model robustness. It is shown that a central bank must limit this preference and opacity about it to ensure the dynamic stability of the economy. An optimal inflation contract with a zero penalty rate provides no incentive for a central bank to be opaque. The latter must rebalance the benefit of avoiding very bad outcomes in worst case scenarios and the economic costs due to higher macroeconomic volatility.