This book gathers national and international reports from around the globe on key issues in the field of antitrust and intellectual property. Its first part discusses to what extent competition law should be concerned with differences in prices, terms and conditions, or quality that suppliers offer different purchasers. A detailed international report explores the major trends and challenges in this field and provides an excellent comparative study on this complex and challenging subject. In turn, the second part examines whether there should be legal restrictions on the ability of persons who claim, without sufficient justification, to hold IP rights that have been infringed on, to bring, or to threaten to bring, legal proceedings based on such claims against their competitors or others. In this regard, the book brings together the current legal responses across a number of European countries and elsewhere in the world, all summarised and elaborated on in an international report. The book also includes the resolutions passed by the General Assembly of the International League of Competition Law (LIDC) following debates on each of these topics, which include proposed solutions and recommendations. The LIDC is a long-standing international association that focuses on the interface between competition law and intellectual property law, including unfair competition issues.