Sarah's Soothing Diapers, Inc. and Orville's Odorless Diapers, Inc. are duopolists, who have agreed to collude. Orville has decided that he will comply with the collusive agreement as long as Sarah cooperated in the previous period. But if Sarah cheated in the previous period, Orville will punish Sarah by cheating in the current period. Orville's strategy is referred to as a

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Orville's strategy is a tit-for-tat strategy, where he cooperates if Sarah cooperated in the previous period and cheats if Sarah cheated in the previous period.