Mr Bot knows not.

I recommend "Cannibals and Kings" by Marvin Harris. He talks an awful lot about evolution of culture in that book, though I don't recall a specific discussion of size. He did address population size in relative terms.

And Kerry. Harris is also a Marxist in that he sees a pattern of advancement in cultural evolution that he believes is consistent. I don't know anything about Harris' politics per se (nor really anything else about him).

B