What is "rational egoism"

n. 1 (context philosophy English) The doctrine that it is rational to act in one's own self-interest 2 (context philosophy English) The theory espoused by Ayn Rand incorporating this doctrine with ethical egoism.

Rational egoism (also called rational selfishness) is the principle that an action is rational if and only if it maximizes one's self-interest. The view is a normative form of egoism. It is distinct from psychological egoism (according to which people are motivated only to act in their own self-interest) and ethical egoism (that moral agents ought only to do what is in their own self-interest).