Online "feedback mechanisms" - also known as "reputation systems" - have been implemented in the most important private e-markets, such as eBay, Yahoo!, Amazon to foster trust and cooperation among trading partners. In this paper we discuss the main issues relevant for the optimal design of such...

We consider a budget-constrained mechanism designer who selects an optimal set of projects to maximize her utility. A project's cost is private information and its value for the designer may vary. In this allocation problem, the selection of projects - both which and how many - is endogenously...

We consider a budget-constrained mechanism designer who selects an optimal set of projects to maximize her utility. Projects may differ in their value for the designer, and their cost is private information. In this allocation problem, the quantity of procured projects is endogenously determined...

The procurement of complex projects is often plagued by large cost overruns. One important reason for these additional costs are flaws in the initial design. If the project is procured with a price-only auction, sellers who spotted some of the flaws have no incentive to reveal them early. Each...

We consider a budget-constrained mechanism designer who selects an optimal set of projects to maximize her utility. A project's cost is private information and its value for the designer may vary. In this allocation problem, the selection of projects - both which and how many - is endogenously...

We compare beauty contests with first-price sealed-bid and scoring auctions, using data on public procurement of cleaning services in Swedish municipalities. The lowest submitted and winning bids are similar in all auction designs despite a higher price sensitivity of procurement bureaucrats in...

The procurement of an innovation involves motivating a research effort to generate a new idea and then implementing that idea efficiently. If research efforts are unverifiable and implementation costs are private information, a trade-off arises between the two objectives. The optimal mechanism...

Due to the well-known efficiency--rent extraction trade-off, the optimal mechanism in a pure screening environment (e.g., revenue maximization in auctions or cost minimization in procurement) typically calls for distortions in allocative efficiency when agents possess private information at the...

We study entry and bidding in procurement auctions where contracts are awarded to the bid closest to a trimmed average bid. These auctions, common in public procurement, create incentives to coordinate bids to manipulate the bid distribution. We present statistical tests to detect coordinated...

We provide a positive analysis of the equilibrium bidding and bribing strategies with and without corruption in a first-price, sealed-bid, procurement auction with two-dimensional-type bidders. With corruption, we assume that the quality of the bidders are unobservable and non-contractible...