§12A-2-328.

§12A-2-328.
   
   (1) In a sale by auction if goods are put up in lots each lot is the
   subject of a separate sale.
   
   (2) A sale by auction is complete when the auctioneer so announces by
   the fall of the hammer or in other customary manner. Where a bid is
   made while the hammer is falling in acceptance of a prior bid the
   auctioneer may in his discretion reopen the bidding or declare the
   goods sold under the bid on which the hammer was falling.
   
   (3) Such a sale is with reserve unless the goods are in explicit terms
   put up without reserve. In an auction with reserve the auctioneer may
   withdraw the goods at any time until he announces completion of the
   sale. In an auction without reserve, after the auctioneer calls for
   bids on an article or lot, that article or lot cannot be withdrawn
   unless no bid is made within a reasonable time. In either case a
   bidder may retract his bid until the auctioneer's announcement of
   completion of the sale, but a bidder's retraction does not revive any
   previous bid.
   
   (4) If the auctioneer knowingly receives a bid on the seller's behalf
   or the seller makes or procures such a bid, and notice has not been
   given that liberty for such bidding is reserved, the buyer may at his
   option avoid the sale or take the goods at the price of the last good
   faith bid prior to the completion of the sale. This subsection shall
   not apply to any bid at a forced sale.