- 1990 – $1 – based on 1985 PPP price data
- Mean of national poverty line of 6 poor countries
- 2015 – $1.90 – based on 2011 PPP price data
- Mean of national poverty line of 15 poor countries
- 2022 – $2.15 – based on 2017 PPP price data
- Mean of national poverty line of 28 poorest countries
- Below $2.15 – extreme poverty
- Methodology developed by Martin Ravallion, Gaurav Datt, and Dominique van de Walle
- Economic researchers at the World Bank
648 million people across the world in 2019 – below the $2.15 International Poverty Line – extremely poor
International Poverty Lines
- Measured in international prices
- Using purchasing power parity (PPP) exchange rates
- PPP exchange rates – equivalently prices across countries – of same quantity of goods and services
- Methodologically, only the number values of the international poverty lines change. The real value remains same
- What cost $1.90 in 2011 PPP prices would cost $2.15 in 2017 PPP prices