Market economies make people more egalitarian. This is one of the fascinating conclusions presented in this excellent lecture by Herbert Gintis on evolution and morality, which incorporates important economic lessons (HT Selva Brasilis). Biologists and anthropologists, you're welcome to my classes.
The criticism of Richard Dawkins is right on target.
BTW, on Darwin and evolution, make sure that you check an interesting PBS documentary broadcasted recently titled What Darwin Never Knew.