What motivates people to behave morally; and how is this motivation connected to rational self-interest? The author starts from the beginning of the development of game theory and reviews the rational choice theories on the source of morality of the past 75 years to lay the ground for his own answers to those questions. He argues that motivation for moral action could not be separated from self-interest. Moral sense is simply the ability to understand cultural rules - formed and maintained in interactions of rational individuals - that set the conditions for enjoying the benefits of being an approved member of the society.
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