Stijn Vanormelingen Licos, KU Leuven   De Bériot straat 34 3000 Leuven Leuven, Belgium   stijn.vanormelingen@econ.kuleuven.be   http://www.econ.kuleuven.be/stijn.vanormelingen           JEL Areas: L1 : Market Structure, Firm Strategy, and Market Performance: General C1 : Econometric and Statistical Methods: General