This major three volume work contains 54 key papers which reflect the invigoration, innovation and imagination that has characterized the field of microeconomics during the last 50 years. The selections range from literary treatments to the most advanced mathematical presentations. However all readers, regardless of their mathematical sophistication or methodological predilections, will find a large number of the papers interesting and worthwhile in giving an overview of the present state of microeconomics and providing guides to the literature of specialities of particular interest. Each one of these carefully structured volumes contains an introduction which offers the reader a brief discussion of the nature and significance of the contributions of each selection. Where worthwhile, cross references to other relevant selections are included in the summary. It is hoped that the reader's task will be aided materially by this systematization and concise discussions of the selections. This landmark book is an essential reference guide for professors, researchers and students concerned with the major innovations and advances in microeconomics.