The theory that everybody ought to serve his or her own interests is called

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Universal ethical egoism is the theory that suggests everyone should act in their own self-interest. This contrasts with individual ethical egoism, which applies this principle only to oneself, and with radical altruism, which advocates for selfless concern for the well-being of others. Social Darwinism, on the other hand, applies the concept of "survival of the fittest" to societies and cultures, rather than focusing on the ethical imperative for individuals to pursue their own interests.

The Theory That Everybody Ought to Serve His or Her