Ordinarily, an additional consistent oral term may be shown only if the contract was partially integrated. The parol evidence rule bars evidence of such a term if the contract was fully integrated. However, when there is additional consideration for the term orally agreed, it lies outside the scope of the integrated contract and may be introduced. In effect, the law treats each separate consideration as creating a new contract; the integrated written document does not undercut the separate oral agreement, as long as they are consistent. Buyer purchases Seller’s business on a contract; as part of the agreement, Seller agrees to stay on for three weeks to help Buyer “learn the ropes.” Buyer realizes she is not yet prepared to go on her own. She and Seller then agree that Seller will stay on as a salaried employee for five more weeks. Buyer cannot use the parol evidence rule to preclude evidence of the new agreement: it is a postcontract modification supported by new consideration. Similarly, parties could choose to rescind a previously made contract, and the parol evidence rule would not bar evidence of that.
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