There is a large body of evidence indicating that cross-country differences in income levels are associated with differences in productivity. If workers are much more productive in one country than in another, restrictions on immigration lead to large efficiency losses. The paper quantifies these losses, using a model in which efficiency differences are labor-augmenting, and free trade in product markets leads to factor price equalization, so that wages are equal across countries when measured in efficiency units of labor. The estimated gains from removing immigration restrictions are huge. Using a simple static model of migration costs, the estimated net gains from open borders are about the same as the gains from a growth miracle that more than doubles the income level in less-developed countries.
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|Date of creation:||Aug 2012|
|Date of revision:|
|Publication status:||published as John Kennan, 2013. "Open Borders," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 16(2), pages L1-L13, April.|
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