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...

We study auctions in which the number of potential bidders is large, such as in Internet auctions. With numerous bidders, the expected revenue and the optimal bid function in a first price auction result in complicated expressions, except for a few simple distribution function for the bidders'...

In second price internet auctions with a fixed end time, such as those on eBay, many bidders snipe , i.e., they submit their bids in the closing minutes or seconds of an auction. Late bids of this sort are much less frequent in auctions that are automatically extended if a bid is submitted very...

In eBay s Buy-it-Now auctions sellers can post prices at which buyers can purchase a good prior to an auction. We study how sellers set Buy-it-Now prices when buyers have independent private values for a single object for sale. We test the predictions of a model by combining the real auction...

Using online auction data, we address the endogeneity involved in estimating the eff ect of the number of bidders on the winning bid. We introduce a novel instrumental variable. Our results indicate that the bias arising from treating the number of bidders as exogenous, is substantial

We present an empirical investigation of the role of marketing agencies in Google's online ad auctions. By combining data on advertisers' affiliation to marketing agencies with data on bidding in ad auctions, we analyze how changes in the concentration of clients in the same industry under the...

This paper studies the seller's online listing strategy and its consequences. By focusing on the fixed-price posting, buy-it-now auction and regular auction, we empirically investigate how the sellers choose the listing format and its associated strategic instruments to better understand their...

I model the environment of Internet auction sites, such as eBay, as sequential ascending auctions. New buyers may enter the auction site after some of the auctions have completed and only bid for the remaining auctions. I characterize a perfect Bayesian equilibrium in the dynamic game. Because...

In second price internet auctions with a fixed end time, such as those on eBay, many bidders "snipe", i.e., they submit their bids in the closing minutes or seconds of an auction. Late bids of this sort are much less frequent in auctions that are automatically extended if a bid is submitted very...

In Buy-It-Now (BIN, hereafter) auctions, sellers can make a "take-it-or-leave-it" price offer (BIN price) prior to an auction. We analyse experimentally how eBay sellers set BIN prices and whether they benefit from offering them. Using the real eBay environment in the laboratory, we find that...