In this bound-to-be controversial book, Lant Pritchett argues that irresistible demographic forces leading to greater international labor mobility are being checked by immovable anti-immigration ideas of the citizens of rich countries. He proposes breaking the deadlock through policies that support development while also being politically acceptable in those well-off nations. These include reliance on bilateral rather than multilateral agreements; greater use of temporary worker permits; permit rationing; and protection of migrants' fundamental human rights.