As a seller, you have the opportunity to choose whether your wine should be sold at a fixed price or auction. There are benefits to both options.
Fixed price means that you specify which price you want, and in this way there is a "buy now" price, which is shown in the image below. In this way you get the exact price that you state if you sell your wine.
You can also choose to sell your wine at auction. At this option you select a starting price, and then the potential buyer can submit bids, as seen in the picture below. The price gets higher if there are several bidders that are interested in buying the wine.