Phil finds gift certificates to a spa that he and Claire had won in a charity auction in a drawer, but they expire that day. He wants Claire to use them because otherwise their money just goes to charity, but Claire doesn’t know how she will find the time to be able to go. Phil is falling victim to the sunk cost fallacy, while Claire is thinking in terms of the additional costs and benefits of using the certificates before they expire.
See more: altruism, irrationality, opportunity cost, rationality, sunk cost, tradeoffs
Economics of Modern Family 