The USD 1.25 poverty line corresponds to the mean of national poverty lines for the 10-20 poorest countries of the world, while the USD 2 line is the median poverty line found among developing countries as a whole. People living with less than USD 1.25 a day are said to be in extreme poverty. The poverty data here concern low-and middle-income countries as categorized in line with World Bank definitions (http://data.uJorldbank.org/ about/country-classifications). At these low income -thresholds poverty rates in high-income countries are close to zero.