The document discusses the concept of ethical egoism. It provides background on how ethical egoism was introduced by philosopher Henry Sidgwick in 1874. It states that according to ethical egoism, an action is morally right if it is intended to pursue one's own desires or interests. The document then discusses different types of egoism, including personal ethical egoism, individual ethical egoism, universal ethical egoism, hedonistic egoism, and rational egoism. It also mentions several contributors to egoism theory, such as Adam Smith, Ayn Rand, and James Rachels.