The article (and study) makes a leap that doesn't appear to be supported in the data. Namely, that the social capital (“connections”) built in a fraternity are

The article (and study) makes a leap that doesn't appear to be supported in the data. Namely, that the social capital (“connections”) built in a fraternity are the reason for higher income. I would propose an alternate hypothesis: that men who seek out and/or have been a part of a fraternity are better at building unrelated social capital that does affect income. Or, put another way, that men who build a network of fraternity brothers are going to be better at building professional networks as well. While the former may bolster the latter, and while the two may not be mutually-exclusive sets, the career benefit comes from the latter.