The Economics of Vendor Bids

This study scrutinizes the implications of a vendor bid in an open ascending auction with a seller of an indivisible good and many potential buyers. The seller can set a reserve price, and both the seller and the bidders have private signals and interdependent values. We show that no strictly increasing reserve price function exists in the presence of a vendor bid. We also show that a vendor bid must be large enough to be credible, and thus vendor bids may not be used in equilibrium. The vendor will exercise her vendor bid option if and only if her private signal is large enough.