This volume takes a critical look at the current divide over immigration policies. It hopes to shed new light on the debate by bringing together papers that investigate the link between trade and factor mobility, particularly labour migration, from theoretical and empirical perspectives. The team of distinguished international contributors including William J. Collins, Kevin O'Rourke, Jeffrey G. Williamson, Gianni Toniolo, James R. Markusen suggest far-reaching implications for business, policy making and scholarship. A significant addition to the literature on the economics of migration.