This book provides the first detailed examination of how private individuals and companies can enforce their rights under competition law against other private parties in the EU and UK. It provides a comprehensive analysis of the legal basis for private antitrust enforcement both under EC and the new UK law, and of the available procedures and remedies. The book then goes on to systematically survey all of the key issues of law and practice that arise in private antitrust litigation in the USA, such as locus standi, antitrust injury, methods of proof of damage, types of damage for which compensation is recoverable, and the principles of antitrust damage calculation. In each case, the author draws upon his experience of such litigation as a practitioner in the USA to set out detailed practical conclusions as to how the same issues should be addressed in the EU and UK.