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because he screwed me over in period one
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that I won't go along with the renegotiation.
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It may also be the case,
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and we'll see some examples of this on the homework assignment,
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that the many equilibria in the second stage of the game
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are not such that a punishment for Patrick is also a punishment for me.
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What really caused the problem here was,
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in trying to punish Patrick, I had to punish myself.
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But you could imagine games,
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or see some concrete examples on the next homework assignment,
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in which punishing Patrick is rather fun for me,
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and punishing me is rather fun for Patrick,