There is something subjective about rationality. Given that belief aims at truth, there is a sense in which we "fail" whenever we have false beliefs. But it would be far too harsh, too "objective", to call this a failure of rationality.

What is subjective rationality?

An agent is said to be subjectively rational when decisions are. consistent with the available facts and, where these are lacking, with the agent's own sub- jective assessments.

What is the concept of rationality?

Rationality is the quality or state of being rational – that is, being based on or agreeable to reason. Rationality implies the conformity of one's beliefs with one's reasons to believe, and of one's actions with one's reasons for action.