Results from first-price, sealed-bid auctions, in which there is uncertainty regarding the number of bidders, are reported. Consistent with recent theoretical findings, concealing information regarding the number of bidders raises more revenue for the seller than revealing information....

In an experimental investigation of Milgrom and Roberts' (1992) model, play consistently converges to a unique equilibrium, providing evidence of sophisticated strategic behavior that the theory predicts. Play starts with monopolists at their myopic maxima, followed by an attempt to pool, and...

A single monopolist plays a sequence of eight periods against a series of different entrants. There are two types of monopolists, "weak" monopolists whose single-period best response is to acquiesce after entry, and "strong" monopolists whose dominant strategy is to fight entry. Data show high...