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.
Social class in the United States
Dennis Gilbert places 13% of households among the "working poor" with 12% being in the "underclass". Thompson & Hickey place roughly 17% to 20% of households in the lower classes. The lower classes constituting roughly a fifth to a quarter of American society consists mainly of low-rung retail and service workers as well as the frequently unemployed and those not able to work. Overall, 13% of the population fall below the poverty threshold. Hunger and food insecurity were present in the lives of 3.9% of American households, while roughly twenty-five million Americans (ca. 9%) participated in the food stamp program.