Convergence of antitrust laws has become a reality. This article provides a general view on this phenomenom both within the European Union and worldwide. Within the European Union, a paradoxical situation has arisen since, in spite of the “one stop shop system”, convergence is stronger in merger control than in antitrust. In an international context, the EU model seems to prevail over the US model, as far as the institutional system is concerned. The International Competition Network (ICN) plays a major role in this evolution.
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1. In the 1970s and 1980s, comparative studies in competition  law were often limited to an examination of US antitrust law and EC competition law, sometimes with timid references to the national law of an industrialized state. There was no comprehensive research on the development of competition law in Europe. Fortunately, David Gerber 's first book filled this gap by proposing a historical and global approach that went beyond the mere technical presentation of the texts. The data have since changed considerably. In 2012, the scope of the comparison can now cover all five continents. The International Competition Network's website is enlightening in