From article:
Moving tends to make people more productive, especially if it is from a poor country to a rich one. Michael Clemens of the Centre for Global Development, a think-tank, estimates that if a typical migrant from a poor to a rich country is allowed to work, he can earn three to five times more than he did at home. (And this assumes that he learns no new skills, though he probably will.) To win such a prize, migrants will take huge risks. A study by Linguère Mbaye of the African Development Bank found that those heading from Senegal to Europe were prepared to accept a 25% chance of dying in the attempt.
If all international borders were completely open, global GDP would double, Mr Clemens estimates. For political reasons, that is very unlikely to happen. In America, liberal immigration bills die in Congress. In Europe, the surge of refugees from Syria and the Paris terror attacks have reinvigorated xenophobic political parties and jeopardised free movement within the EU.
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