Mistake (contract law) void. Traditionally, Caveat Emptor (let the buyer beware), and under Common Law Caveat Venditor (let the seller beware). A contract might be voidable from unilateral mistake for any of the following: A mutual mistake occurs when the parties to a contract are both mistaken about the same "material" fact within their contract. They are at cross-purposes. There is a meeting of the minds, but the parties are mistaken. Hence the contract is voidable. "Collateral" mistakes will not afford the right of rescission. A collateral mistake is one that 'does not go to the heart' of the contract. For a mutual
Caveat emptor if a buyer who inspects new goods with reasonable promptness discovers them to be "nonconforming" (failing to meet the description provided or any other standards reasonably expectable by a buyer in his/her situation) and does not use the goods or take other actions constituting acceptance of them, the buyer may promptly return or refuse to accept ("reject") them and demand that the defect be remedied ("cured"). When goods fitting the same description and expectations are available for sale ("e.g.", when the vendor has other instances of the same mass-produced merchandise in stock inventory), either the vendor or the buyer may