| http://www.w3.org/ns/prov#value | - First, they are based on infrequently conducted household surveys that vary enormously in quality and can suffer from various types of errors and bias, including the fact that wealthier households may for many reasons want to understate their income, while poorer households may overstate it. (Many households may also be unable to compute their income.) Second, incomes, even when adequately measure
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