An interesting theory there is that it's primarily a combination of (a) women aren't socialised to negotiate as hard (b) everybody is socialised to regard a woman negotiating hard more negatively than a man doing so.

Since both of these things seem to me to suck anyway I figure we might as well fix them and see what happens. Of course, exactly how 'fix them' works is a tricky question.

Good point. But, what if it still comes down to risk taking? (not assuming a biological component)

Interesting link. It's disappointing that the author doesn't link to some form of source however (to the skeptic to this hypothesis, the claims are to be taken on the author's word).