Each nation has its own threshold for absolute poverty line; in the United States, for example, the absolute poverty line was US$15.15 per day in 2010 (US$22,000 per year for a family of four), while in India it was US$1.0 per day and in China the absolute poverty line was US$0.55 per day, each on PPP basis in 2010. These different poverty lines make data comparison between each nations official reports qualitatively difficult. Some scholars argue that the World Bank method sets the bar too high, others argue it is too low. There is disagreement among experts as to what would be considered a realistic poverty rate with one considering it "an inaccurately measured and arbitrary cut off". Some contend that a higher poverty line is needed, such as a minimum of $7.40 or even $10 to $15 a day. They argue that these levels would better reflect the cost of basic needs and normal life expectancy.One estimate places the true scale of poverty much higher than the World Bank, with an estimated 4.3 billion people (59% of the worlds population) living with less than $5 a day and unable to meet basic needs adequately.
The proportion of the developing worlds population living in extreme economic poverty fell from 28% in 1990 to 21% in 2001. Most of this improvement has occurred in East and South Asia.In 2012 it was estimated that, using a poverty line of $1.25 a day, 1.2 billion people lived in poverty. Given the current economic model, built on GDP, it would take 100 years to bring the worlds poorest up to the poverty line of $1.25 a day. UNICEF estimates half the worlds children (or 1.1 billion) live in poverty. The World Bank forecasted in 2015 that 702.1 million people were living in extreme poverty, down from 1.75 billion in 1990. Extreme poverty is observed in all parts of the world, including developed economies. Of the 2015 population, about 347.1 million people (35.2%) lived in Sub-Saharan Africa and 231.3 million (13.5%) lived in South Asia. According to the World Bank, between 1990 and 2015, the percentage of the worlds population living in extreme poverty fell from 37.1% to 9.6%, falling below 10% for the first time. During the 2013 to 2015 period, the World Bank reported that extreme poverty fell from 11% to 10%, however they also noted that the rate of decline had slowed by nearly half from the 25 year average with parts of sub-saharan Africa returning to early 2000 levels. The World Bank attributed this to increasing violence following the Arab Spring, population increases in Sub-Saharan Africa, and general African inflationary pressures and economic malaise were the primary drivers for this slow down.