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Normally, in cases of significant underprice, the seller can demand a retraction of the sale (Shulchan Aruch, Choshen Mishpat 237:2, q.v.), though he cannot demand that the sale remain intact but the buyer pay the difference in price (S'ma :6). Although that doesn't normally apply to documents (SA :29), it does when the underprice is by more than half (Rama ...
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