| http://www.w3.org/ns/prov#value | - This is often lower than the poverty line of $13,133 for a family of three of in 1998 (Strawn, Greenberg, and Savner 2001) (when most of these surveys tabulated their data) and well below the amount a family needs to purchase adequate housing, food, health care, child care, and other basic necessities.
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