“…The empirical literature has focused on both the pricing strategies of originators postpatent expiration (Frank and Salkever, 1992, Scherer, 1993, Regan, 2008 as well as on prices of the follow-on and generics (Lu and Comanor, 1998, Ekelund and Persson, 2003, Danzon and Furukawa, 2011, Mueller and Frenzel, 2015. There is a large literature on price discrimination (third degree) and welfare effects (Scherer, 2000, Danzon, 1997, Malueg and Schwartz, 1994 and when in the presence of heterogeneous consumers firms can profitably divide the market in different brand loyal and not-brand loyal groups via advertising to achieve second degree price discrimination (de Frutos et al, 2013).…”