But cultural norms warp things a little more. The cultural tendency is for a man to marry down, and a women marry up in social level terms.

Which means there's a layer of women near the top who can't find a husband. Particularly in professional careers. And the lowest social rung of men have no women to marry down.

This asymmetry means there's a band of powerful and successful women who don't normally find husbands. They become China's "leftover women", who have basically given up on the idea of marriage beyond the age of 27. One recent solution here is these women look abroad for suitable husbands. Despite being negged annually, the social stigma of not marrying up takes many options away from women.