Debating Brain Drain: May Countries Restrict Emigration?

Blake, Michael, and Brock, Gillian. Debating Brain Drain: May Countries Restrict Emigration? Oxford: Oxford University Press, 2015.
Many of the best and brightest citizens of developing countries choose to emigrate to wealthier societies, taking their skills and educations with them. What do these people owe to their societies of origin? May developing societies legitimately demand that their citizens use their skills to improve life for their fellow citizens? Are these societies ever permitted to prevent their own citizens from emigrating? 
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