Adam Smith pointed out that people go live in cities because then they can specialize in their trades; you are not going to be a shoemaker in a hamlet, nor a po

Adam Smith pointed out that people go live in cities because then they can specialize in their trades; you are not going to be a shoemaker in a hamlet, nor a porter in a village. Given that the trend goes that far back, it is not really strange that we see more of it now, when even fewer people are working the land.