For the source text click/tap here: Bava Batra 83
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If the seller sold what was purported to be superior wheat and it was found to be inferior, the buyer can retract.
The seller might also want to void the sale if the price rises, but he does not have this option.
It is not a fraudulent sale, where both can retract. Rather, it is more akin to a case of price fraud or overcharge since the buyer did receive wheat, albeit of inferior quality.
We explore the issue of defective merchandise as well as fraudulent sales and advertising.