Ezra Klein finds an interesting study that gauges what factors contribute to men and women falling out of middle class society:
The big takeaway: Divorce and marriage matter, a lot. Education, or lack thereof, is pretty important, too. The picture gets blurrier with drug use: Men who use heroin are more likely to fall out of the middle class, but the effect is statistically insignificant for women. And crack use doesn’t make much of a difference for either gender.