All winning bidders pay the same price per item, which is the lowest successful bid. There are no Reserve Price for Dutch Auction. The bids are sorted in order of price, then time, and then quantity. If bids are for the same price, then the earlier bid wins. If there are two bids for the same price and time, then larger bid wins over the smaller bid.
Bidders can refuse partial quantities.
For example, if you place a bid for 30 items and at end of auction there are only 25 items available, you don't have to buy any of them. Bids are sorted in order of price then time then quantity. The entire quantity was purchased by the other two bidders. An English Auction can only be used for a single item. In English Auction the seller has two options, either set the Minimum Bid , or set both the Minimum Bid and the Reserve Price .