The book summarizes his findings on oxytocin and discusses the role of oxytocin in human experiences and behaviors such as empathy, altruism, and morality.
Zak's research aims to challenge the thought that people generally are driven primarily to act for what they consider their self-interest,[4] and asks how morality may modulate one's interpretation of what constitutes "self-interest" in one's own personal terms.[5] Methodological questions have arisen in regards to Zak's work, however.[6] Other commentators though have called his work "one of the most revealing experiments in the history of economics." [7]