Sarah Halpern-Meekin is Assistant Professor of Human Development and Family Studies at the University of Wisconsin-Madison.Kathryn Edin is Distinguished Bloomberg Professor in the Department of Sociology and the Bloomberg School of Public Health at Johns Hopkins University. She is the coauthor of "Doing the Best I Can: Fatherhood in the Inner City, Promises I Can Keep: Why Poor Women Put Motherhood before Marriage, " and "Making Ends Meet: How Single Mothers Survive Welfare and Low-Wage Work."Laura Tach is Assistant Professor of Policy Analysis and Management at Cornell University.Jennifer Syk...