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The 1990 World Development Report from the World Bank defined the “extremely poor” people of the world as those who are currently living on no more than $1 per day per person. But how actually does one live on less than $1 per day? This essay is about the economic lives of the extremely poor: the choices they face, the constraints they grapple with, and the challenges they meet. A number of recent data sets and a body of new research allow us to start building an image of the way the extremely poor live their lives. Our discussion builds on household surveys conducted in 13 countries: Cote d'Ivoire, Guatemala, India, Indonesia, Mexico, Nicaragua, Pakistan, Panama, Papua New Guinea, Peru, South Africa, Tanzania, and Timor Leste (East Timor). These surveys provide detailed information on extremely poor households around the world, from Asia to Africa to Latin America, including information on what they …