Market dominance - encompassing single firm dominance, overt and tacit collusion, mergers and vertical restraints - raises many complex analytical and policy issues, all of which continue to be the subject of theoretical research and policy reform. This second edition of a popular and comprehensive text extends the arguments and combines an analysis of the issues with a discussion of actual policy and case studies. This new edition addresses the recent fundamental changes in antitrust law, especially in the UK and the EU, and reviews some high profile and controversial cases such as the Boeing-McDonnell Douglas merger and the Microsoft monopoly..