"Baldwin's analysis makes clear that Heckscher and Ohlin blazed trails that have aided the progress of later researchers and that will keep doing so. By showing how a path breaking theory can spark subsequent modeling and empirics that synergistically teach us about key economic forces, this book takes the reader on a stimulating intellectual journey."--Scott C. Bradford, Department of Economics, Brigham Young University "This book was worth the wait. Baldwin provides a careful and complete explanation both of the Heckscher-Ohlin model in its various forms, and of the empirical work that first failed, then later succeeded, in finding support for it. Baldwin's insights into both theory and empirics should inform all those who seek to contribute further to understanding international trade."--Alan Deardorff, John W Sweetland Professor of International Economics, University of Michigan -- Alan V. Deardorff "This book was worth the wait. Baldwin provides a careful and complete explanation both of the Heckscher-Ohlin model in its various forms, and of the empirical work that first failed, then later succeeded, in finding support for it. Baldwin's insights into both theory and empirics should inform all those who seek to contribute further to understanding international trade." Alan Deardorff , John W. Sweetland Professor of International Economics, University of Michigan