Auction : The sale of goods to the highest bidder
Auctioneer : Person in charge of public sales when items are sold to the person offering the most money (the highest bidder)..
bid : an offer to buy something at a public sale against competition from others. [bidder, person who makes a bid]
Certificate of conformity : document drawn up by a registered, specialised body, or by an artist, certifying the origin of the work or the object.
Venal value : value in money.