This thesis consists of 4 chapters in the field of applied microeconomics. Chapter 1 develops a model of international roaming. International alliances emerge endogenously and serve as a commitment device to soften competition on the retail market. Chapter 2 provides an explanation for why...

This dissertation encompasses three essays on entry and competition in the German generic drug market. The first paper examines the market entry decisions of generic companies and finds that original drug producrs do not create barriers to entry by launching a generic version of the brand drug...