We introduce the groupwise-pivotal referral (GPR) mechanism for auctions where buyers can participate through referrals. Each buyer's type consists of a valuation and referable buyers. Unlike the second-price auction (SPA), the Vickrey-Clarke-Groves (VCG) mechanism provides referral incentives....

We study mechanisms for environments in which only some of the agents are directly connected to a mechanism designer and the other agents can participate in a mechanism only through the connected agents' referrals. In such environments, the mechanism designer and agents may have different...

We study mechanisms for environments in which only some of the agents are directly connected to a mechanism designer and the other agents can participate in a mechanism only through the connected agents' referrals. In such environments, the mechanism designer and agents may have different...

A seller wants to allocate an indivisible product among a number of potential bidders by a finite deadline, and to contact a bidder, she needs to incur a search cost. We show that the seller's optimal search outcomes can be implemented by a sequential search auction, which is characterized by...

This paper explores how a seller should transmit product information to bidders with horizontally differentiated preferences. Under cheap-talk, we show that, in an informative equilibrium, the seller provides less precise information for more popular product attributes. Second, for any given...

This paper provides a more general sufficient condition than Hummel and McAfee (2015) for optimal information disclosure in auctions when there are three bidders. We show that the optimal disclosure policy is related to the skewness of the distribution of bidders' valuations. Specifically, if...

We study the effects of corruption on equilibrium competition and social welfare in a first-price public procurement auction. In our model, firms are invited into the auction at positive costs, and a bureaucrat runs the auction on behalf of a government, who may request a bribe from the winning...