Mary has just finished eating at an out-of-town restaurant she knows she will never visit again.The food and service were excellent.She leaves a 20% tip.Mary's behaviour is

Question

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Mary's behavior can be seen as a psychological solution to a commitment problem. She may want to ensure good service in case she ever visits the restaurant again or may want to feel good about leaving a generous tip. It is not a material solution (B) as she is not gaining any tangible benefit from leaving a tip. It is not consistent with narrowly-defined self-interest (C) as she is giving away money without any direct benefit to herself. It is not uncommon (D) to leave a generous tip for excellent service. It is also not naïve (E) to do so.

Mary Has Just Finished Eating at an Out-Of-Town Restaurant She