Federal minimum wage in the U.S.
Though there is a minimum hourly wage in the U.S., the value of that minimum wage has decreased over time as the wage fails to adjust with inflation. In the 1960s and 1970s the federal minimum wage was equivalent to about 9 dollars in 2013, while the 2013 federal minimum wage was 7 dollars.
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"Federal Minimum Wage."
http://en.wikipedia.org/wiki/United_States_labor_law
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