On The Glenn Show, Glenn and Harold discuss the growing field of behavioral economics. Harold argues that 401(k) plans show both the benefits and the limits of benign paternalism. What about people too poor to have a 401(k)? Glenn and Harold consider how behavioral economists are studying the developing world. They close by discussing Sendhil Mullainathan and Eldar Shafir's new book Scarcity, which explores why poor people make self-limiting decisions.