Here's an anecdote about the girl shortage in China, culled from my friend Anna, an overseas Chinese who often goes back there. The starter point is that you'd think the girls would all be scooped up by the plutocrats who could afford (one way or the other) to buy them. But Anna says this overlooks an important innovation in the job market: these days women have economic live of their own. They can get jobs that are as good as or better than the ones available to the men.
The consequence: what Chinese women are looking for these days is a househusband. Or as Anna puts it: if you won't cook for me, I don't want to marry you. I can only begin to imagine the whole new cast of human relationships in the offing if Anna happens to be right.