A 3 minute talk on the Financial Consequences of Too Many Men. It seems the perceived sex ratio strongly influences male behaviours.

The perception that women are scarce leads men to become impulsive, save less, and increase borrowing, according to new research from the University of Minnesota's Carlson School of Management.

Research on this in the context of online forums such as ours might be very interesting.

A related blog entry by Peter Frost title Our brideprice culture that deals with societal implications of gender imbalance. It begins with highlighting a gender imbalance that many mention when talking about China but don't notice in is clearly present in the West as well, he then proceeds to discuss the likely consequences for society. The analysis is cogent and somewhat depressing.

A side point:

Will the operational sex ratio return to normal in the future? No, but it may stop getting worse. The trend toward male longevity seems to have almost maxed out for all reproductive ages. And fewer older men will be reentering the mate market—the baby boomers are getting a bit old for that sort of thing. But then we’ll probably also see more polygyny of the non-serial kind. Simultaneous polygyny is hard to measure, since it’s illegal, but it seems to be a growing phenomenon. The incidence of gonorrhea and chlamydial infection is now higher in women than in men, an indication that the population of promiscuous individuals is disproportionately female (Miller et al., 2004).

I disagree, I think this is an indicator of sexual inequality between men.