Contents: Introduction. Part I - Concepts. Effective competition. The assessment of market power. The relevant market. Part II - Application. Article 81. Article 82. Merger control. Part III - Measurement. Introduction to empirical analysis. Introducing multiple regression analysis as a tool of antitrust policy. Estimating elasticities. Price correlation analysis. Shipment and transport costs tests. Price concentration studies. Bidding studies. Granger causality and cointegration tests. Summary. Appendices.