Market definition for antitrust purposes is by now firmly rooted in economic analysis both in the US and the EU, even if the approaches are slightly different. This paper examines the theoretical basis for the legal definitions and assesses whether the general principles need to be adapted when...

Recent theoretical research on the implications of two-sided markets is gaining recognition for its implications in antitrust. However, the role of empirical analysis in antitrust cases for two-sided markets has been unexplored thus far. Empirical tools of economics are playing an increasingly...