(It matters that the underclasses don’t)
Rich people are outliers. It’s not that important that rich people reproduce. Although we should laud the great (noble) families that persist in the reproduction of excellence across generations and ask them to serve us by greater reproduction. But wealth tells us very little. Economies are lotteries, and they must be or people would cease to play the economic game. So in the end, the general necessity is that the middle class is afforded all opportunities to breed, and the underclass is afforded all opportunities to consume rather than breed, so that we constantly defeat the red queen’s regression to the mean.