Antitrust and competition law is a fast moving area of law and the subject of extensive academic research. The aim of this volume is to select articles as tools for understanding how antitrust and competition law is applied to unilateral conduct which is harmful to the consumer and to the competitiveness of the market. The articles examine the meaning of dominance and monopolisation and show that although legal and economic rules have been developed to establish whether undertakings hold such strong market positions, it is often difficult to determine with certainty that the undertaking being investigated meets the threshold. The various debates on pricing and non-pricing conduct are also represented as are the conflicts that have arisen regarding the exercise of intellectual property rights by powerful undertakings, particularly in the context of the new economies. The volume includes scholarly articles published on both sides of the Atlantic and enables a greater understanding of the application of antitrust and competition law from the point of view of economics and politics.