Currently, the European Union finds itself in troubled waters. It has to prove that its benefits outweigh the costs of its endeavour. In this respect, an EU competition policy that focuses on consumer welfare is one way to gain support by the citizens of its member states. The Roaming Regulation...

In the current market environment, the actual dynamics of the application of internal corporate factors is differentiated. The company thus tries to influence customers' shopping behavior as effectively as possible. Therefore, it is important for the company to be able to adapt to these changes...

This thesis contains three distinct, single-authored papers that are all related to the field of industrial organization. Chapter 2 proposes an empirical framework that allows to estimate the degree of industry competition and the degree of horizontal integration of merging firms. Thus, this...