Drawing on panel data on daily fuel prices covering over 5,000 filling stations in Germany, this paper documents a change in the stations' price setting behavior following the introduction of a legally mandated online price portal in 2013. Prior to the portal, positive asymmetry is found on the...

Market delineation is a fundamental tool in modern antitrust analysis. However, the definition of relevant markets can be very difficult in practice. This preliminary draft applies a new methodology combining a simple price correlation test with hierarchical clustering -a method known from...