A 2016 study published in Nature: Scientific Reports discusses a model in which phenotypes would converge toward a sense of fairness with the expectation of cooperation in the human lineage. The authors cite social manipulation to be the mechanism for "overshadowing" genetic disposition for selfishness. They could that there is a threshold above which social manipulation is no longer necessary as altruism drives selfless cooperation.
A bit heavy on theory and light on data, but the idea caught my eye. Find the article here if you'd like to read further.
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