"Today the economic performance of American cities is more uneven than ever before. Some cities are growing fast, attracting innovative employers and adding well-paying jobs. Other cities are falling behind, shedding jobs and losing population. As the economic fortunes of American communities keep growing apart, the financial return for geographic mobility keeps increasing, but only some Americans exploit this opportunity."
— From THE NEW GEOGRAPHY OF JOBS by Enrico Moretti, excerpted in the Wall Street Journal.
