The cost of protectionism to the poor

The Economist magazine writes,

A study by Pablo Fajgelbaum of the University of California, Los Angeles, and Amit Khandelwal, of Columbia University, suggests that in an average country, people on high incomes would lose 28% of their purchasing power if borders were closed to trade. But the poorest 10% of consumers would lose 63% of their spending power, because they buy relatively more imported goods. The authors find a bias of trade in favour of poorer people in all 40 countries in their study, which included 13 developing countries.

In short, free trade has been good for the poor.