The ad cites the most recent annual Census Bureau findings on median annual income, released last September. And indeed, Census concluded that in 2010, “the earnings of women who worked full time, year-round were 77 percent of that for men working full time, year-round.”
But that’s the median (midpoint) for all women in all jobs, not for women doing “the same work” or even necessarily working the same number of hours. Furthermore, the raw gap for all women is not quite as large when looking at weekly earnings rather than yearly earnings.
Last year, looking at weekly earnings, the Labor Department put the figure at 81 cents on the dollar for 2010. It found that the median weekly earnings for women working full time at jobs paying a wage or salary was $669, compared with $824 for men. And although all these workers had normal work weeks of at least 35 hours (the minimum for “full time”), the Labor Department study noted that, for whatever reason, “men were more likely than women to have a longer workweek.”