Good news on the gender-wage gap?

It's hardly ideal, and I have to imagine that the gap is far larger in developing countries, but "you know that 'women make 77 cents to every man’s dollar' line you’ve heard a hundred times? It’s not true" (Slate):

The fact that men are more likely to be in unions and have their salaries protected accounts for about 4 percent of the gap. The big differences are in occupation and industry. Women congregate in different professions than men do, and the largely male professions tend to be higher-paying. If you account for those differences, and then compare a woman and a man doing the same job, the pay gap narrows to 91 percent. So, you could accurately say in that Obama ad that, “women get paid 91 cents on the dollar for doing the same work as men.”

That said, there is a larger discussion that needs to be had:

Goldin and Lawrence Katz have done about as close to an apples-to-apples comparison of men’s and women’s wages as exists. (They talk about it here in a Freakonomics discussion.) They tracked male and female MBAs graduating from the University of Chicago from 1990 to 2006. First they controlled for previous job experience, GPA, chosen profession, business-school course and job title. Right out of school, they found only a tiny differential in salary between men and women, which might be because of a little bit of lingering discrimination or because women are worse at negotiating starting salaries. But 10 to 15 years later, the gap widens to 40 percent, almost all of which is due to career interruptions and fewer hours. The gap is even wider for women business school graduates who marry very high earners. (Note: Never marry a rich man).

If this midcareer gap is due to discrimination, it’s much deeper than “male boss looks at female hire and decides she is worth less, and then pats her male colleague on the back and slips him a bonus.” It’s the deeper, more systemic discrimination of inadequate family-leave policies and childcare options, of women defaulting to being the caretakers. Or of women deciding that are suited to be nurses and teachers but not doctors. And in that more complicated discussion, you have to leave room at least for the option of choice—that women just don’t want to work the same way men do.