, a senior fellow in Economic Studies and co-director of the Center on Children and Families, discusses his new book  and outlines why distinctions in the American middle class matter.  Also in this episode: , director the of , stops in for our regular "Coffee Break" segment. Subscribe to Brookings podcasts or on , send feedback by email to  and follow us at on Twitter. The Brookings Cafeteria is a part of the Brookings Podcast Network.