The parol evidence rule is based on the theory that either there never was an oral agreement or, if there was, the parties purposely abandoned it when they executed their written contract.

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The parol evidence rule states that extrinsic evidence, including oral agreements, cannot be used to contradict or supplement the terms of a written contract. The rule is based on the idea that the parties intended their written contract to be the complete and final expression of their agreement. Therefore, any prior or contemporaneous oral agreements are deemed irrelevant and unenforceable.

The Parol Evidence Rule Is Based on the Theory That