This book offers a comprehensive and insightful reflection on David Ricardo's ingenious theory of international trade. Divided into three parts, Part I presents the "birthday boy", his concept and the many applications and insights that have been derived from it, particularly in modern times. Part II explores in depth important aspects of the Ricardian trade theory through the eyes and experience of leading experts on international trade theory, taking into account the latest research in the field. Lastly, Part III discusses current challenges of globalization in the light of Ricardian trade theory and includes the original "On Foreign Trade" written and published by David Ricardo in 1817.