If these indirect benefits do matter, it may explain why Mr Prasad and company failed three years ago to prove a link between the migration of capital and growth.

ECONOMIST: Economics focus

In a study of 127 developing countries in 2009, the prospect of migration boosted human capital, rather than draining it.

ECONOMIST: The medical workforce

Born in the capital of the old Confederacy, brought north by her parents as part of that great migration, Dr. Height was raised in another age, in a different America, beyond the experience of many.

WHITEHOUSE: Remembering Dr. Dorothy Height

The January 2010 earthquake that devastated the capital, Port au Prince, and surrounding communities did not result in an immediate wave of mass migration to the United States, as some had feared.

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