U.S. male/female wage comparison 1979–2005
Women consistently make less than men in the workplace. It is likely a result, at least in part, of in-group favoritism.
Source
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"U.S. Women Wage Equity."
http://upload.wikimedia.org/wikipedia/commons/d/d7/US_womens_earnings_as_a_percentage_of_mens_1979-2005.gif
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