interesting. But I thought traditionally there are way more poor people than there are rich people, and that poor people have way more kids than rich people. In fact it's a little depressing that the poor will always be with us instead of being evolutionary losers and be a problem that will'take care of itself'.
Poor people having more babies than rich people seemed weird to me, but in reality, throughout history, poor people (or people with little status) make babies that don't really make it to adulthood at the rate of high status people (see Gregg Clark). Overall, in Malthusian societies, there's not enough food to go around, and the poor are the last to be fed.
