This handbook serves as a source, reference, and teaching supplement for industrial organization (or industrial economics), the broad field within microeconomics that focuses on business behavior and its implications both for market structures and processes, and for public policies towards them. Comprehensive and up-to-date surveys are provided of recent developments and the state of knowledge in the major areas of research in this field as of the latter part of the 1980's, written at a level suitable for use by non-specialist economists and students on advanced graduate courses. Each chapter can be read independently, although they are organized into sections.