How effectively does a decentralized marketplace aggregate information that is dispersed throughout the economy? We study this question in a dynamic setting where sellers have private information that is correlated with an unobservable aggregate state. In any equilibrium, each seller's trading...

We develop a model where some investors are uncertain whether others are trading on informative signals or noise. Uncertainty about others leads to a non-linear price that reacts asymmetrically to news. We incorporate this uncertainty into a dynamic setting where traders gradually learn about...

A monopolistic seller is marketing a good to a customer whose willingness to pay is determined by both his private type and the “quality.” The seller can design a menu of both prices and experiments - that reveal information about quality. We show that the optimal mechanism features both...