The Single Economic Entity Doctrine as an Essential Criterion for the Application of Antitrust Law on a Corporate Group --The Implementation of Article 101(1) TFEU on a Corporate Group of Companies: Practice of the Commission and the European Courts --The 'Single Economic Entity' Doctrine: An Assessment of 'Privileges and Responsibility' in a Corporate Group --Intermediate Result --The Concept of Corporate Liability --An Assessment of Corporate Group Liability on the Basis of 'Organizational Autonomy' --Conclusion.