> Superficially, this sounds a little like [group selection](/pages/Group%20selection.txt), but it is really nothing of the kind. It sounds like group selection because it enables us to think of a population as having a stable equilibrium to which it tends to return when disturbed. But the [ESS](/pages/Evolutionarily%20stable%20strategy.txt) is a much more subtle concept than group selection. It has nothing to do with some groups being more successful than others. --p72, [The selfish gene](/pages/The%20selfish%20gene.txt)