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
Dandekar and Rath in 1971 used a daily intake of 2,250 calories per person to define the poverty line for India. Using NSSO data regarding household expenditures for 1960–61, they determined that in order to achieve this food intake and other daily necessities, a rural dweller required an annual income of 170.80 per year ( 14.20 per month, adjusted to 1971 Rupee). An urban dweller required 271.70 per year ( 22.60 per month). They concluded from this study that 40 percent of rural residents and 50 percent of urban residents were below the poverty line in 1960–61.