Measuring poverty

Recent trends in absolute poverty
Poverty is usually measured as either absolute or relative poverty (the latter being actually an index of income inequality). Absolute poverty refers to a set standard which is consistent over time and between countries. An example of an absolute measurement would be the percentage of the population eating less food than is required to sustain the human body (approximately 2000-2500 calories per day for an adult male).


The World Bank defines extreme poverty as living on less than US $1 (PPP) per day, and moderate poverty as less than $2 a day, estimating that "in 2001, 1.1 billion people had consumption levels below $1 a day and 2.7 billion lived on less than $2 a day." The proportion of the developing world's population living in extreme economic poverty fell from 28 percent in 1990 to 21 percent in 2001. Looking at the period 1981-2001, the percentage of the world's population living on less than $1 per day has halved.


Most of this improvement has occurred in East and South Asia. In East Asia the World Bank reported that "The poverty headcount rate at the $2-a-day level is estimated to have fallen to about 27 percent [in 2007], down from 29.5 percent in 2006 and 69 percent in 1990."


In Sub-Saharan Africa extreme poverty went up from 41 percent in 1981 to 46 percent in 2001, which combined with growing population increased the number of people living in poverty from 231 million to 318 million.