In many cases, buyers are not informed about their valuations and rely on experts, who are informed but biased for overbidding. We study auction design when selling to such “advised buyers”. We show that a canonical dynamic auction, the English auction, has a natural equilibrium that...

In procurement auctions, suppliers' senior managers in charge of bidding often rely on advisors, such as project managers and technical specialists, to evaluate project costs. These advisors may be biased for inflating the costs due to agency or career concerns. We study the procurement agency's...