>historically, we see that the rich and educated upper echelons of society have apparently always struggled with fertility Do you have a source for this? I've

>historically, we see that the rich and educated upper echelons of society have apparently always struggled with fertility Do you have a source for this? I've read that it was the opposite until the 19th century. (Supposedly the source for this claim is "A Farewell to Alms: A Brief Economic History of the World".)