Les dernières décennies ont témoigné d’un important accroissement des concentrations transnationales dans le monde et d’une multiplication des systèmes de contrôle des concentrations. Alors que les enjeux économiques revêtent désormais une dimension internationale, les mécanismes juridiques de régulation demeurent cantonnés à une échelle nationale ou régionale. En effet, la soumission d’une même opération de concentration à différents régimes de contrôle engendre plusieurs problématiques juridiques, dont le risque d’être confronté à des décisions contradictoires ou incohérentes rendues par différentes autorités de la concurrence. Ceci dit, il nous semble que des mécanismes juridiques pour réguler les concentrations transnationales s’imposent. S’agissant d’une réalité au niveau européen, la « régionalisation » du droit de la concurrence apporte une aide précieuse à ces problématiques. Au niveau mondial, différentes approches de solution sont envisageables. Cette thèse soutient, à court terme, la convergence des règles et des pratiques, afin de réduire les inconvénients associés au contrôle des concentrations transnationales, accompagnée, à long terme, par l’adoption de certaines règles contraignantes au sein de l’OMC. / In the past decades, the number of transnational mergers worldwide has significantly increased. Merger control systems follow the same trend and have proliferated during this period. While economic issues are globalized, legal mechanisms remain national or regional. The notification of one single merger to different merger control systems raises several legal issues, in particular with respect to the risk of achievingcontradictory or incoherent decisions from different competition agencies. Thus, revised legal mechanisms are required in order to adequately regulate transnational mergers. A“regionalization” of merger control, as set by the European experience, offers useful insights towards proposals to deal with these issues. In a global perspective, several alternative approaches are possible. This thesis supports, on the short-term, a permanent convergence of rules and practices to reduce problems related to transnational merger control, followed, on the long-term, by the adoption of certain binding rules within the WTO.

隨著世界各國開放市場，事業間的競爭已步入國際化，是以競爭法制與政策也必須國際化，然而各國間競爭法規範的調和並未隨著經貿自由化而自然達成。本文點出競爭法與國際接軌的重要性，進一步檢視各國就競爭法案件在單邊、雙邊、複邊等層次將面臨哪些執法上的問題。又因國際反競爭案件越趨頻仍，競爭法主管機關間的合作需求隨之提高，究竟在執法合作上可能面臨哪些困難與限制，未來在合作上發展的趨勢如何，本文將循序漸進加以探討。目前國際間迄未形成一套強勢的競爭法制，世界貿易組織（World Trade Organization, WTO）亦放棄在杜哈談判回合處理競爭議題，然經貿自由化對國際競爭法制仍持續注入新元素。譬如各國簽訂之自由貿易協定與區域經濟整合，多設有競爭相關章節，並開始關注國營事業涉及的反競爭問題（即競爭中立的問題），此等新發展亦屬本文探討之範圍。 / Along with the trend of trade liberaliztion, the competition among enterprises has gone global. However, the competition rules seem to have no chance to reach international coordination in the near future. This article emphasizes that it’s important for a nation to coordinate its own competition law with other countries. Thus, the issues of competiton law enforcement at unilateral level, bilateral level, plurilateral level, regional level, and mutilateral level are also well discussed in this article. Due to the increasing number of anti-competition cases, the need for enforcement cooperation has risen. As a result, this article spends many efforts on recognizing the restraints and obstacles when cooperating with other competition authorities, trying to find the solutions to the problems of cooperation. Despite the fact that WTO failed to deal with international competition issues, there are many ambitious FTAs and reginal trade agreements trying to make common competition rules, which induce new elements into the field of international competition laws and policies. For exaples, TPP and many FTAs are in the negotiation of competitive neutrality requirement in the draft agreements. Such new development will not be excluded when speaking of international competition laws and policies.