Investment behavior, evolution?

It is generally agreed that civilization began by farmers. I claim that the reason farmers develop civilization is due in part to the modification/evolution of a new investment behavior. Behavior that requires the delay of gratification, and rely heavily on anticipating "natural world", and "human behavior". The latter develop into "social manipulation". My evidence is that there is a lot of evidence for evolution in the last 10,000 years. According to one source, we are more different from the people that live in 0 A.D then they are with people in the 50,000 B.C. There is also the thesis that this huge evolutionary change is due in part to farming. Thus, we can plausibly infer that farming also motivated the evolution of investment behavior.