We study a multi-unit auction environment similar to eBay. Sellers, each with a single unit of a homogenous good, set reserve prices at their own independent second-price auctions. Each buyer has a private value for the good and wishes to acquire a single unit. Buyers can bid as often as they...

Internet auctions, such as those on eBay, are known for multiple bidding and sniping. Buyers send bids in the closing seconds of an auction, knowing that bids arriving after the closure of the auction are not counted. They also bid several times at the same auction. We model Internet auction as...

At Internet auction sites like eBay, similar goods are often sold in a sequence of auctions, separated by small amounts of time. Buyers can therefore benefit from forward-looking strategies that take into account available information about future auctions. This paper develops a model of such...

A great deal of late bidding has been observed on internet auctions such as eBay, which employ a second price auction with a fixed deadline. Much less late bidding has been observed on internet auctions such as those run by Amazon, which employ similar auction rules, but use an ending rule that...

An increasing number of commercial companies are using online reverse auctions for their sourcing activities. In reverse auctions, multiple suppliers bid for a contract from a buyer for selling goods and/or services. Usually, the buyer has to procure multiple items, which are typically divided...

In this paper we undertake an empirical study of advertising in an online auctions market, or, more precisely, advertising on eBay. The type of advertising that we consider works as follows: at the time of listing the item on eBay, sellers are offered the option of incurring an extra fee in...

The existing auction literature treats on-line auctions as running independently of one another with each bidder choosing to participate in only one auction. In fact, in the case of on-line auctions, many substitutable goods are auctioned concurrently and bidders can bid at several auctions at...

For some kinds of goods, rarity itself is valued. "Fashionable'" goods are demanded in part because they are unique. In this paper, we explore the economics of rare goods using auctions of limited-edition shoes held by an e-commerce platform. We model endogenous entry and bidding in multi-unit...

Online auction environments provide several sources of information that can be used by bidders to form their bids. The impact of this information on bidding is likely to be higher when ambiguously specifi ed products are auctioned. The secondary market represents one such environment, where used...

The Internet enables sellers to offer products through multiple channels simultaneously. In particular, many sellers utilize online auctions in parallel to other online and offline channels. Using an analytical model and data from eBay Motors, we study seller behavior and auction outcomes in the...