As mentioned earlier, this is a restitution issue. He can either attempt to rescind the contract (because of mistake or other qualifying legal theories) or seek unjust enrichment.
However, mistake is not that simple. Mistake only works if the party seeking to use it as an excuse to the contract does not bear the burden of mistake. A party can bear the burden of mistake by either the contract allocating it to him ("as is" provision), by the court allocating it to him through equity, or if the buyer realizes he does not have adequate knowledge regarding the transaction yet goes through with it anyways.
However, mistake is not that simple. Mistake only works if the party seeking to use it as an excuse to the contract does not bear the burden of mistake. A party can bear the burden of mistake by either the contract allocating it to him ("as is" provision), by the court allocating it to him through equity, or if the buyer realizes he does not have adequate knowledge regarding the transaction yet goes through with it anyways.


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