Digital Platforms have become one of the main actors in todays economy. Their performance on the market has also given rise to different competition concerns. Due to that Competition Authorities bothin the United States and in the European Union during the last years have developed some tools and conducted proceedings in order to asses this competition problems, which will be studied in the present book. In relation to the new mechanisms for the enforcement of competition Law, new competition instruments such as the included in GWB Novelle: paragraphs 19a GWB and 32f GWB have to be highlighted.