Which of the following is required for a seller to sell goods at auction?

For a seller to sell goods at auction, having full ownership of the items is essential. Ownership ensures that the seller has the legal right to transfer the property to a buyer during the auction process. Without full ownership, the seller could not legally conduct the sale, putting both the seller and the auctioneer at risk of legal issues that might arise from selling items that the seller does not fully own.

Other factors, such as establishing a minimum bid or the presence of multiple bidders, are not universally required for an auction to take place. A seller may choose to set a minimum bid, but it is not a legal requirement for selling at auction, as auctions can start with open bidding from any price. Similarly, while having multiple bidders is beneficial for generating competition and potentially raising the final sale price, an auction can still occur with a single bidder. Lastly, the condition of the goods (whether new or used) is also not a legal requirement for the sale at auction; used items can be sold just as easily as new ones. Thus, full ownership is the most critical requirement for a lawful auction sale.