brain gain
n. An increase in the number of highly skilled intellectual and technical workers due to those workers relocating from a less favorable environment (cf. brain drain)

Example Citation:
"Another example of Canada's 'brain drain' to the south? Just the opposite. Mr. Kaplan is an American who came the other way—part of this country's often-overlooked 'brain gain.' "
—Jennifer Lewington, "Is Canada really losing its brains?," The Globe and Mail

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