People living in extreme poverty

Estimates for 1820 to 1970 are based on the estimates on the share of people living in extreme poverty from Bourguignon and Morrisson. 2002. “Inequality Among World Citizens: 1820-1992 .” American Economic Review, 92 (4): 727-744. The series is poverty headcount (1.90$ per day) as far back as possible (1981) from the World Bank, and all observations before 1980 are from Bourguignon and Morrison. 2002. “Share of the World Population Living in Extreme Poverty.”