Pay gaps widen as hours worked increases.
From: http://www.womensmedia.com/new/Lips-Hilary-gender-wage-gap.shtmlFor men and women working equal hours they pay gap may exist anywhere between 84.6 cents per dollar at 40 hours per week and 78.3 at 60+.
Women are more likely than men to work part-time. However, most gender wage comparisons leave out part-time workers and focus only on full-time, year-round workers. A close look at the earnings of women and men who work 40 hours or more per week reveals that the wage gap may actually widen as the number of hours worked increases. Women working 41 to 44 hours per week earn 84.6% of what men working similar hours earn; women working more than 60 hours per week earn only 78.3% of what men in the same time category earn (Source: Bureau of Labor Statistics). Furthermore, women may work longer to receive the promotions that provide access to higher pay. For example, among school principals, women have an average of 3 years longer as teachers than men do (Source: National Center for Education Statistics). So it is hard to argue that women’s lower earnings are simply a result of women putting in fewer hours per week, or even fewer years than men.