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FWIW

Gender pay gap in the United States - Wikipedia

The average woman's unadjusted annual salary has been cited as 78%[2] to 82%[3] of that of the average man's. However, after adjusting for choices made by male and female workers in college major, occupation, working hours and parental leave, multiple studies find that pay rates between men and women varied by 5–6.6% or, women earning 94 cents to every dollar earned by their male counterparts. The remaining 6% of the gap has been speculated to originate from other unmeasured differences, a greater value placed on non-wage benefits, gender discrimination and a difference in willingness and/or skills to negotiate salaries.[4][5][6]