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This Wonkcast was originally recorded in February 2011. Andy Sumner updates the data from the original Bottom Billion brief in his recent working paper, Where Will the World's Poor Live? An Update on Global Poverty and the New Bottom Billion.

Paul Collier’s 2007 book, The Bottom Billion: Why the Poorest Countries are Failing and What Can Be Done About It, changed the way we think about poverty and development. Collier argued that the majority of the 5-billion people in the "developing world" live in countries with sustained high growth rates and would eventually escape from poverty. The rest—the bottom billion—live in 58 small, poor, often land-locked countries that are growing very slowly or not at all. These countries, stuck in poverty traps, should be the focus of foreign aid, Collier argued.