The research reported in this book began as part of a Ph.D. dissertation submitted to the University of Pittsburgh in 1976. Revisions were accomp­ lished at Florida International University in Miami. There have been many people who were instrumental in the formation and completion of this research. The contributions made by Jack Ochs are far too numerous to mention. Jack''s insights and suggestions will always be appreciated. I am also grateful to Melvin Greenhut, David Houston, Tatsuhiko Kawashima, Asatoshi Maeshiro, William Miernyk, Josephine Olson, Peter Nijkamp and Harry Richardson who read and critically re­ viewed earlier manuscripts. I am doubly indebted to Harry Richardson who initially suggested this investigation. Special thanks are in order for Gene Gruver, Peter Montiel, Randy Miller and James Wheller for always finding the time to hear out many of my arguments. In addition, I appreci­ ate the valuable suggestions they made as well. I am grateful, moreover, to Janice Carlino who most generously gave of herself to assist in this in any way she could. Janice not only helped with data preparation and with typing-entire drafts of earlier manuscripts, but, more importantly, showed an unusual degree oftolerance toward one for whom the research effort is not the most tranquil of experiences.