This document discusses several methods for accurately measuring and understanding global poverty levels, including: 1) Adjusting for differences in currency exchange rates and purchasing power parity to compare GDP between countries. 2) Considering factors like country size, population distributions, and quality of life measures when analyzing changes in average incomes and poverty levels. 3) Disaggregating global data to obtain more detailed headcount information on poverty in individual countries, to account for issues like missing data.

1. International Poverty

5. Source: World Bank

8. Source: World Bank

10. Poverty lines

18. What do the numbers say? Source: World Bank

19. What do the numbers say? Source: World Bank; Sala-i-Martin

20. What do the numbers say? Source: World Bank; Sala-i-Martin