The clerk who files cancelled checks at the bank has $2.02 in her own account. The woman who copyedits medical textbooks has not been to a dentist in a decade. This is the forgotten America. At the bottom of its working world, millions live in the shadow of prosperity, in the twilight between poverty and well-being. Whether you’re rich, poor, or middle-class, you encounter them every day. They serve you Big Macs and help you find merchandise at Wal-Mart. They harvest your food, clean your offices, and sew your clothes. In a California factory, they package lights for your kids’ bikes. In a New Hampshire plant, they assemble books of wallpaper samples to help you redecorate. They are shaped by their invisible hardships. Some are climbing out of welfare, drug addiction, or homelessness. Others have been trapped for life in a perilous zone of low-wage work. Some of their children are malnourished. Some have been sexually abused. Some live in crumbling housing that contributes to their children’s asthma, which means days absent from school.