This was interesting, but I think there's another dimension to it. It's not merely that ag created a property incentive to promote monogamy - there's also a hug

This was interesting, but I think there's another dimension to it. It's not merely that ag created a property incentive to promote monogamy - there's also a huge change in terms of shared experience and the creation of the idea of class. In a tribe there's very a much a shared culture with shared culture and shared social bonds, while in the modern world there's an endless fractal of subcultures and individualism. And the more educated you are, the smaller the people here share enough of a permutation of culture to feel similar is. I think this somewhat explains why divorce rates are higher for the less educated - having more in common it's easier for there to be widespread understanding and shared culture, which in turn sets a lower bar (or creates a higher probability) that people will be able to functionally bond with each other. Conversely, going to college narrows the pool of people who have enough shared tribal characteristics to be a part of the comfort zone, and it increases even further when people express their tendencies to want relationships with people who share interests/traits/experiences/educational choices. In a tribe every shared the same experiences. Likewise, nearly everyone shares similar K-12 experiences. So within these cohorts there would naturally be a high replacability, which should mean monogamy ought to become less valued. On the other hand, people who go to college and matriculate through to different careers are basically funneling themselves into situations where there are fewer people with enough shared experiences to be a part of the tribe, making the value of an individual relationship increase. TLDR: The less mainstream someone is, the more they should have an incentive to value an individual relationship. Thus the more uniform and cohesive the social group, the less value is likely placed on an individual relationship. Hence we can blame not just property rights, but the fact that civilization and agriculture destroy shared experience compared to hunter/gatherer tribes. This can also explain lower divorce rates among the more educated or uniquely experienced as compared to typical high school graduates.