This book contains the key-note lectures and a selection of papers that were presented at the 15th Conference of the European Association for Research in Industrial Econo mics (EARlE) held under the auspices of GRASP at Erasmus University Rotterdam in 1988, plus an introductory chapter by the Editors. Upon suggestions by the Editors, all papers have been revised for this book, some more extensively than others. Robin Marris has added to his lecture a synopsis of the contributions to the Round Table on the Micro-Macro Interface which he chaired during the Conference. The papers cover issues that seem to be both interesting and relevant for the 1990s. While some of the papers are cast in a rather established research frame -enabling the use of regular academic routines - others are first attempts at delineating the contours of areas that are peripheral to what is often considered as the core of Industrial Organization. In their introductory chapter, the Editors set forth that a neglect of those areas may well relegate Industrial Organization to social irrelevancy. Therefore, it is hoped that the book will also contribute to a reflection on the main lines of Industrial Organization research for the 1990s -thus helping to create a healthy perspective for this part of economics at a time when macroeconomics is undergoing a severe crisis.