After two decades of brilliant research on American poverty, Kathryn Edin noticed something she hadn’t seen since the mid-1990s — households surviving on virtually no income. Edin teamed with Luke Shaefer, an expert on calculating incomes of the poor, to discover that the number of American families living on $2.00 per person, per day, has skyrocketed to 1.5 million American households, including about 3 million children.