“On average, a Nigerian working in Nigeria earned one-fifteenth as much as a comparably skilled Nigerian working in America. Indian workers living in India did slightly better, earning about a sixth of what an equally skilled co-national did in the United States. Workers from Mexico multiplied their income 2.4 times simply by stepping across the border. Guatemalans who made the trip tripled their paycheck. Haitians who moved to the United States saw a tenfold jump in earnings.”