When you are at an auction, the auctioneer must follow some rules. They cannot accept a bid from the vendor, which is the person selling the property, unless certain conditions are met. The auction must say that vendor bids are allowed, the auctioneer must say when a vendor bid is made, and the vendor bid must be less than the reserve price, which is the minimum price the vendor will accept. You should know that a vendor bid is when the vendor or someone acting for them makes a bid. The rules are in place to ensure transparency and fairness in the auction process, and you can find more information about the legislation by visiting the https://legislation.govt.nz/act/public/1986/0120/latest/link.aspx?id=DLM175004 or the https://legislation.govt.nz/act/public/1986/0120/latest/link.aspx?id=DLM969166.