This paper provides an overview of the development of Internet advertising. We offer a broad overview of both online and offline advertising and the economic models that allow one to evaluate competition among advertisers. We focus on the extent to which various types of online advertising...

Market definition is a core concept of competition law in the European Union, the United States and Brazil. The present contribution first surveys the general approach to market delineation in these three jurisdictions. Against this background, it then embarks on a discussion of market...