Die Rolle sogenannter Gatekeeper in der digitalen Medienwelt wird aktuell sowohl in Wissenschaftskreisen als auch Netz- und Medienpolitik vehement und kontrovers diskutiert. Gehen von den Gatekeepern der digitalen Welt wie Google, Apple, Youtube, Facebook, Twitter etc. besondere Gefahren fur den...

The question how mergers affect innovation has gained prominence in a number of recent merger cases. Accounting for the likely effects of mergers on innovation is difficult for a number of reasons though. First of all, the relationship between market concentration and innovation is far from...

This paper analyses the interdependency between the market for music recordings and concert tickets, assuming that there are positive indirect network effects both from the record market to ticket sales for live performances and vice versa. Using a model with two interrelated Salop circles we...

This paper analyses the interdependency between the market for music recordings and concert tickets, assuming that there are positive indirect network effects both from the record market to ticket sales for live performances and vice versa. In a model with two interrelated Hotelling lines prices...

Das Internet ist stark durch Wettbewerb zwischen Plattformen geprägt, welche potenzielle Tauschpartner zusammenbringen. Die Konkurrenz zwischen solchen mehrseitigen Plattformen und die Marktkonzentration wird maßgeblich bestimmt durch (1) die Stärke der indirekten Netzeffekte, (2) das Ausmaß...

Turkish consumer survey data is used to analyze the main factors that affect consumers' choice of different mobile telecommunications networks. The analysis shows that consumers' choice is significantly affected by the choices of other consumers with whom the consumer is more likely to interact....

This papers analyses how horizontal mergers affect innovation activities of the merged entity and its non-merging competitors. We develop an oligopoly model with heterogeneous firms to derive empirically testable implications. Our model predicts that a merger is more likely to be profitable in...