brain trade
n.— «Scholars are now puzzled by the fact that many bright Africans are leaving their homelands to go and do menial jobs in the developed world. This is what is commonly referred to as Brain drain or Brain trade.» —“Are Remittances the New Driving Force of African Economies?” by Allan Brian Ssenyonga The New Times (Kigali, Rwanda) Oct. 2, 2006. (source: Double-Tongued Dictionary)