Now, consider the "meta-brain-drain" of 1) increased assortative mating (people are increasingly more likely to marry someone of similar educational and professional achievement) and 2) college-educated women delaying childbirth and having fewer children than non-college-educated women. The net result is that more educated people tend to have fewer children than the less educated. If we assume educational attainment…
> This doesn't bode well for future generations. It hasn't impacted any generations thus far. Low income and/or poorly educated Americans have always had more children than higher income/well educated Americans. From back when health standards were terrible, to when having more kids meant more hands to work the farm. Yet society still has found a way not to collapse on itself.
But is this Universally true? 250 years of US history is a blip in Human history.
You could argue that lower classes used to have a lot of children because child mortality rate and morbility rate was very high. Also children were needed as labour, with a role in the household or working along side their mother or father. With modern healthcare, social security, and children rights legislation none of the previous pattern is true.
In comparison higher income people or more accurately land owning ruling class had the luxary of better nutrition and several children were a way of reducing the risk of having no heir to handover to.
Another fundamental difference for higher income families introduced with Christianity is that the ruling class was now (officially) restricted to a single wife. In comparison if you look at several empiries in Asia and Africa, the biggest benefit of power and wealth (from a patriarch perspective) was the ability to 'acquire' multiple wifes and to maximise your genetic descent, the most brutal example of this was probably Genghis Khan.
The point I wanted to make is that having several (surviving) children used to be a privilege reserved for the rich and powerful of whatever society at the time. However with our science/social/legal achievements and progress this is no longer true in our social fabric and I am unsure we can accurately predict how this 'recent' change will impact humans as a whole.