International migration is a multifaceted phenomenon that has gained momentum in the international agenda as a fundamental public policy issue, such as global warming or the financial crisis. This Chapter aims at contributing to the literature on migration in a twofold manner: first, reviewing key PE theories regarding migration, in order to determine which combination of them could assure a better understanding of present migration dynamics; second, considering the suitability, efficiency and democracy of current instruments of global transaction over migration in light of new migratory trends and challenges.
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