Poverty
The poverty line threshold of $1.90 per day, as set by the World Bank, is controversial. 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 nation's official reports qualitatively difficult. Some scholars argue that the World Bank method sets the bar too high, others argue it is low. Still others suggest that poverty line misleads as it measures everyone below the poverty line the same, when in reality someone living on $1.20 per day is in a different state of poverty than someone living on $0.20 per day. In other words, the depth and intensity of poverty varies across the world and in any regional populations, and $1.25 per day poverty line and head counts are inadequate measures.
Poverty in India
The World Bank has reviewed its poverty definition and calculation methodologies several times over the last 25 years. In early 1990s, The World Bank anchored absolute poverty line as $1 per day. This was revised in 1993, and the absolute poverty line was set at $1.08 a day for all countries on a purchasing power parity (PPP) basis, after adjusting for inflation to the 1993 US dollar. In 2005, after extensive studies of cost of living across the world, The World Bank raised the measure for global poverty line to reflect the observed higher cost of living. Thereafter, the World Bank determined poverty rates from those living on less than US$1.25 per day on 2005 PPP basis, a measure that has been widely used in media and scholarly circles.