Recent research argues that model uncertainty leads the central bank to adjust interest rates stronger to exogenous disturbances than under certainty. This paper investigates whether the introduction of a cost channel of monetary transmission, whose presence is empirically supported, changes the impact of model uncertainty on interest rate setting. The model is simple enough to facilitate an analytical solution. I find that the presence of the cost channel dampens the effect of model uncertainty on interest rate setting and can offset the activist policy stance. A richer model that allows for persistent supply and demand shocks corroborates these findings. Copyright (c) The London School of Economics and Political Science 2008.
