You have to eat some capitalist axioms for this book and be kinda proficient in statistics. The Plot: Migrants moving from countries with low productivity to high productivity nations increase wealth. Do they increase wealth for all? Yes, even the population in the destination country. but wait....what about: Do the migrants bring the things, institutions, beliefs which caused the low productivity in their home country to the destination country? (New economic case against immigration) Benjamin and Alex: Could be... Let's see...no, actually not. Free migration increases wealth. One part suprised me: Apparently there is correlation between diversity (as in diverse migrants) and union membership. There is a case for low Unionism in USA and high Immigration.