Our book is the collective effort of six economists with a great deal of help from their colleagues, teachers, families, and friends and, of course, the publisher (we especially thank Elizabeth Wald at Blackwell). As originally conceived, the book was to have only two authors (Quentin and Rob), but as the scope of the text expanded so did the need to bring in additional expert- ise for the chapters on non-market valuation (Vic), water (Steven), trade and biodiversity (Diane), and forestry and the global commons (Harry). We view this collective expertise as a major strength of the book
