Our joint research began in 1986 at the Warwick Summer Workshop in the UK. We did not expect it to last this long, but it grew from strength to strength. This book is very much a product of this long research partnership between two individuals who were born within a month of each other. On the whole we worked on the basic theme of trade and industrial policy under asymmetric oligopoly, and one piece followed from another in a natural way. The book attempts to present the fruits of our research in a unified and coherent way. Many of the chapters of the book have appeared in journals: chapter 1 is based on Lahiri and Ono (1988), chapter 2 on Lahiri and Ono (1999b), chapter 4 on Lahiri and Ono (1997), chapter 5 on Lahiri and Ono (1999a), chapter 7 on Lahiri and Ono (1998a), chapter 8 on Lahiri and Ono (2003), and chapter 10 on Lahiri and Ono (1998b). Chapter 3 is based on a paper written by Ono on his own (Ono, 1990). However, those articles have been rewritten extensively, often adding new results, in order for the different chapters to fit in with each other. Moreover, we have written two of the chapters (6 and 9) specifically for this book in order to fill some gaps in our overall plan, and excluded a number of our published papers which do not fulfil the aim and objective of the book.