Important and interesting theory. Have you read this article by Paul Graham Mind the Gap? It touches on the aspects of zero-sum economic environments, and argues that the big change happened with the creation of the middle class in Europe. This was the first time it was possible to create wealth and keep the profit to yourself. The possibility to accumulate a fortune by creating wealth is just a couple hundred years old.

Maybe it’s a bit on the side but the “Daddy model” in the article seems to me like zero-sum bias.