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...

This paper summarizes the peculiarities of online markets and discusses recent antitrust cases related to online markets. Following a brief description of the online markets' characteristics and potential tendencies for concentration the paper first discusses the antitrust allegations and...

In broad parts of the scientific community the position in publication performance rankings, based on journal quality ratings is seen as highly reputational for the scientist. This contribution provides evidence that, at least in economics, such publication performance measures can not always be...