Why the American Dream is unraveling, in 4 charts

``[Putnam] makes the case that it's not only in the moral interest of wealthier families to help improve the prospects of poorer children but also in their own economic interest. The U.S. economy would get a major boost if the opportunity gap were closed, he says. We cannot continue to live in our own bubbles, or compartments on a plate, without consequences, he suggests.''