This document discusses several concepts related to ethics and moral reasoning, including: - Moral relativism, which is the belief that morality depends on the society and cannot be evaluated outside of cultural contexts. - Self-interest theory, which claims that people are inherently selfish. However, some argue people may receive hidden benefits like praise or feeling good about helping others. - Definitional arguments for self-interest theory, which say that people feel guilty if they don't help others, so helping makes them less selfish, but choices are still selfish by definition. - Utilitarianism, which is the theory that the morally right action is the one that maximizes happiness for the greatest number of people.