This study introduces Robert H. Frank’s moral sentiments theory (1988), and uses it to discuss the role of moral education. Firstly, following Frank’s commitment model and its evolutionary game process, moral education is defined as temporarily strengthening human inner moral emotion to increase the number of cooperator (good behavior) in a society. Two conclusions are found. (1) In a low moral society, the defector’s benefit is smaller than
cooperator’s. In contrast, in a high moral society, the defector’s benefit is larger than cooperator’s. (2) Moral education (improving a society’s moral level) does not bring social justice. However, it does bring social benefit. Secondly, following Frank’s reputation model, we argue that because reputation can be a strong signal of individual’s inner virtue, moral
education can strengthen individual’s reputation and increase the number of cooperator in a society. In the end, the study suggests that moral education does not need limitation in teaching morality.
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