The primary point of this article is that one of the reasons men make more money the women is the choice of college major - that accounts for 19% of the income gap for the high school class of 1999. This isn't particularly surprising - men choose engineering more, women choose nursing more...this ends up skewing the aggregate pay comparisons between men and women. Fine.
The more disturbing stat is that once women begin achieving parity in male-dominated fields, overall pay for that career goes DOWN. Case in point is biomedical engineering. Yes, engineering. Now that it's basically 50-50, pay has stagnated, whereas male-dominated engineering fields, like electrical engineering, are still highly paid.
They suggest one reason could be that women don't negotiate as much, bringing down the aggregate pay rate of a field when they enter a field en masse. Or that once women join a field in large numbers, the field becomes less valued.
Either way, it's pretty depressing. Selfishly, I guess I'm glad that I'm the only woman for miles in my company. In a larger sense...it's pretty depressing. What do you think it is? The lack of negotiation of the devaluation of a field once many women enter it?