Answer:
Most auctions are without reserve and therefore the auctioneer cannot withdraw the lamp.
Step-by-step explanation:
Every auction seems to be either "of-reserve" versus "without-reserve." So the reaction to whether an auction house manages higher bids depends on that form of bidding being carried out. In an offering with reserves, the auction house may reject a higher offer (retain the privilege to reject ...) in which any better bid should be approved in an offering without deposit.
Put differently, the auction house is not obliged to deliver to the top purchaser in a with reserved sale. Essentially, the next bigger raise reflects the minimum price.