Five drivers of inequality between the rich and the poor

Inequality of income and wealth has surged in the U.S., where reliance on free-market forces has been especially strong compared to other advanced industrialized economies. The dynamics help those with higher levels of education, hurts the less-educated, especially in rural areas, and creates 'superstar' workers, companies and cities. Meanwhile, the middle class is being hollowed out. Here are some of the drivers of this troubling trend.