Egoism refers to excessive interest in one's self; belief that one should be interested in one's self rather than in others. It is a motive (supposedly underlying all behavior) to increase one's own welfare. The opposite of altruism, which aims to increase another's welfare.
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Egoism ia defined as a motive (supposedly underlying all behavior) to increase one's own welfare. It is a philosophical doctrine that maintains that people always act out of self-interest. Egoism is the opposite of Altruism, which aims to increase another's welfare.

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