Knowledge that Transforms

The categories listed below are used to classify books, book reviews, journal articles, and dissertations indexed in JEL and EconLit. The list details the full three-digit classifications used to index journal articles in JEL on CD, EconLit, and e-JEL on www.e-JEL.org . The Annotated Listing of New Books printed in this issue uses the bold face one- and two-digit classifications; the Book Reviews in each issue and the Doctoral Dissertations List printed in December appear under the on-digit classification headings. Please note that books, book reviews, and dissertations are indexed in EconLit using the full three-digit classifications. Those who classify papers or dissertations should choose the most appropriate three-digit classifications. New changes to classification system appear as soon as possible on www.AEAweb.org .

INTEREST GROUPS are ubiquitous in U.S.politics and in the political systems of most nations. In some countries, interest groups are closely aligned with political par-ties and exercise influence through those