Jessica Compton's family of four would have no income if she didn't donate plasma twice a week at her local donation center in Tennessee. Modonna Harris and her teenage daughter, Brianna, in Chicago, often have no food but spoiled milk on weekends.
After two decades of brilliant research on American poverty, Kathryn Edin noticed something she hadn't seen before -- households surviving on virtually no cash income. Edin teamed with Luke...