I read this book in-depth the first chapters while more browsing trough the later half. It is very well written; very accessible. I was fascinated by the idea of applying these type of approaches, in a general way, to understand human behaviour better. Coupling with an understanding of the complexity and that societies are emergent phenomenon i.e. cultural evolution one realizes that actually applying this type of approaches to human behaviour is challenging. I still believe it is a super cool project which I hope to pursue further in the future. For an economist with a background in game theory, I really think it was a great starter for reading things like Wilson's Darwins Cathedral, and Henrich's Secret of Our Success. You get some actual grasp of evolutionary dynamics and equilibriums. I am not sure if anyone has incorporated the actual argument of stable coexistence of different phenotypes in human society and that this might be an integral part of our evolution. I think Bowles&Gintis has some work slightly along these lines discussing how pro-socialness can survive. Further, in "Who we are and how we got here" David Henrich discusses the really deep roots of caste systems in Ethiopia. Could this arise from Smithian evolution? Perhaps this point is a bit controversial, or perhaps the mixing rate for humans is not such that this does occur. I really don't know, but I am as fascinated by the idea now as I was picking up the book. If anyone reading my review knows of applications to human behaviour or evolution, please let me know.