I don't remember anything when I was 2 or before. Doesn't mean I didn't learn anything, but I think increased receptivity in behavior expands years beyond that. I don't think orphan infants have their fates sealed before they meet their adoptive parents.
Greed in its purest form is attaining a need or want at the expense of everything else. That would be counterproductive in a social species that most often requires cooperation to survive. It's been shown that some monkey groups
recognize the value of fairness. That study could play a larger understanding of human evolution. It looks like there is a human dynamic between self interest and percieved equity in groups that makes it an environmental trait for those qualities to emerge in each person.
The Native American culture taught a balance of give and take with themselves and nature. There was greed in them, but it was tied to increasing their prospects for survival in the near future. In hunting/agrarian tribes, killing more buffalo than needed would give them an easier time to face the winter, but they knew that killing too many would be suicidal or would force them to relocate. Success to them could be attained by their role in the community or by their personal feats of endurance and skill, factors that didn't have to be motivated by greed.