ANSWER: Preexisting duty rule
Explanation: It is a common-law rule of contract. This rule says that if a party is required to perform a specfic duty under an existing contract, then the performance of that particular duty cannot be the consideration for a new promise. For example, if a contractor enters into a contract to renovate the house, but midway through the work, refuses to complete it unless the house owner pays additional money. In this event, if the owner promises to pay the additional money, then it will not be enforceable because there is no consideration for that promise under the preexisting duty rule.
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