The story above is the example of bilateral mistake. It is because Sara give inaccurate information about the jacket in the garage sale.
A Mutual legal mistake or also known as bilateral mistake can be described as a falsely operating on information that is inaccurate. Bilateral mistakes can be problematic for both parties because both parties have a misunderstanding of the contract and the contract terms. In the other side, there are unilateral mistakes. Unilateral mistake can be described as a mistake in which one party is mistaken and the other knows or ought to have known of the mistake.
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