http://english.pravda.ru/business/finance/103479-1/The Bureau of the Budget adopted Orshansky's definition for statistical use in all Executive departments in 1965. The measure gave a range of income cutoffs, or thresholds, adjusted for factors such as family size, sex of the family head, number of children under 18 years old, and farm or non-farm residence. The economy food plan (the least costly of four nutritionally adequate food plans designed by the Department of Agriculture) was at the core of this definition of poverty.
The Department of Agriculture found that families of three or more persons spent about one third of their after-tax income on food. For these families, poverty thresholds were set at three times the cost of the economy food plan. Different procedures were used for calculating poverty thresholds for two-person households and persons living alone. Annual updates of the SSA poverty thresholds were based on price changes in the economy food plan.
Two changes were made to the poverty definition in 1969. Thresholds for non-farm families were tied to annual changes in the Consumer Price Index (CPI) rather than changes in the cost of the economy food plan. Farm thresholds were raised from 70 to 85% of the non-farm levels.
In 1981, further changes were made to the poverty definition. Separate thresholds for "farm" and "female-householder" families were eliminated. The largest family size category became "nine persons or more."
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the U.S. government's approach to measuring poverty has remained static for the past forty years.
Hard times ahead