I study the role of minimum bid increments (MBI) in internet auctions using field experiment data. I sell identical gift cards while varying the MBI. Internet auctions have typically been viewed as second-price, implying truthful bidding. However, due to the presence of the MBI, equilibrium...

We consider non-sealed bid online auctions of common products with quantity uncertainty. Both first-price (also known as pay-as-you-bid) and uniform-price auctions are considered. In these auctions, all bidders have the same valuation of the products but may have different demand quantities. The...