Does the assumption of rational self-interest imply that each individual knows what is best for himself or herself?

Question

Quizplus · Accepted Answer

The assumption of rational self-interest implies that individuals make decisions that they believe will maximize their own benefit. This does not necessarily mean that they know what is best for themselves, but rather that they are acting in a way that they believe will lead to the best possible outcome for them.

Does the Assumption of Rational Self-Interest Imply That Each Individual