When one party promises to do what she is already legally obligated to do, the law considers this a preexisting duty and not valid consideration.
A valid consideration is a price paid in exchange for goods or services or a promise to do (or abstain from) something.
A valid consideration must be significant, adequate, and unconditional.
Thus, when one party promises to do what she is already legally obligated to do, the law considers this a preexisting duty and not valid consideration.
Learn more about valid considerations at https://brainly.com/question/1387188 and https://brainly.com/question/1697686
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