Part 2/10:
Posis emphasizes a key concept: there is a difference between being rational and being reasonable. For example, when one is exhausted or hungry, surrendering to junk food is reasonable—though perhaps not rational if viewed from long-term health. Similarly, succumbing to emotional impulses like sleeping in during depression or selling all stocks while drunk are reasonable responses to temporary states but poor from a rational investing perspective.
He extends this analogy to relationships, illustrating that emotional reactions—like accusing a cheating spouse—are reasonable given the emotional turmoil, even if they may seem irrational in a logical context.