More and more people from poor countries are arriving in Europe, North America, and Australia. Should these countries try to keep these immigrants out? No, says British economist and journalist Phillipe Legrain. In Immigrants, he argues that wealthier countries should generally welcome newcomers from poorer countries.

Immigrants is available for purchase at amazon.com

Weigh in: What should be America’s immigration policy and how should we handle the border between the US and Mexico?