Résumé : 'It is an interesting and valuable contribution to the competition literature. It brings together in one place the arguments, both theoretical and empirical, in favour of the introduction of an efficiencies defence. . . the book is a very helpful reference on the consequences of mergers, and on the nature and source of efficiency benefits, particularly economies of scale. . . The papers that comprise this book are a rewarding read both for competition lawyers and for economists. Further, although the discussion of efficiencies is directed towards assessment of merger issues, it has wider application, especially in relation to vertical restraints.' © European Communities, 2006. All rights reserved.