Book excerpt: 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. The author moves on to deal with several unresolved questions including the conflicts between trade and antitrust policy, the foreign take-over of domestic assets and extra-territorial claims made by certain countries.