"… the low 2011 real median household income is the summation, in most cases, of two household earners, whereas in 1967-68 one earner could produce the same real income.
… when both husband and wife have to work in order to maintain the same purchasing power, household income from the wife's in-kind household services is eliminated…. [this] dual household income overstates income, because it is not adjusted for the lost benefits formerly provided by the wife"
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