The New Geography of Jobs by Enrico Moretti

We're used to thinking of the US in opposing terms: red versus blue, haves versus have-nots. But today, there are three Americas. At one extreme are the brain hubs - cities like San Francisco, Boston, and Durham - with workers who are among the most productive, creative, and best-paid on the planet. At the other extreme are former manufacturing capitals that are rapidly losing jobs and residents. The rest of America could go either way.