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These aren't the only other possible payoffs. It's just an idea.
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Suppose I get an A and my pair gets a C,
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then sure I get that initial payoff of 3,
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but unfortunately I can't sleep at night because I'm feeling so guilty.
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I have some kind of moral conscience
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and after I've subtracted off my guilt feelings
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I end up at -1, so think of this as guilt: some notion of morality.
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Conversely, if I chose a Beta and my pair chooses an Alpha,
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so I end up with a C and she ends up with an A,
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then you know I have a bad time explaining to my parents
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why I got a C in this class,
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and I have to say about how I'm going to be president anyway.