In this paper we report new evidence on the importance of price level inertia in the four major European countries: Germany, Prance, Italy and the United Kingdom. We focus on the sensitivity of the results to different proxies for aggregate demand and different measures of equilibrium (or trend output). Overall, our results confirm the findings of related studies, and show that price level inertia is present to a significant degree in Europe. In addition, monetary aggregates appear to be a poor proxy for aggregate demand because of systematic movements in velocity.