Abstract
The academic literature on interest groups has tended to concentrate on the assessment of the relative influence of these groups in different political systems, and on the implications of the activities of interest groups for democratic ideology. In recent years, however, the work of Mancur Olson has stimulated an increasing interest in the formation of interest groups, and in the reasons why individuals (or corporate bodies) join them. The aim of this article is to examine Olson's analysis in the light of a study of one major British economic interest group, the Confederation of British Industry. In the course of this examination I hope to illustrate some of the weaknesses of Olson's analysis and to suggest how it might be refined and developed.

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