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. It examines the substitutability between trade and migration, the impact of regional integration on the location of economic activity, the role of public goods provisions, and the political economy of migration. Several papers quantify the link between trade, trade policies, migration and income distribution in sending and receiving nations using econometric methods and general equilibrium simulations. Case studies of past and present migration episodes are also presented: the impact of NAFTA on migratory pressure and wage gaps; the trade-migration links between Eastern and Western Europe; and the historical experience with migration flows in the nineteenth century.