A seller has an object for sale and can reach buyers only through intermediaries, who also have privileged information about buyers’ valuations. Intermediaries can either mediate the transaction by buying the object and reselling it–the merchant model–or refer buyers to the seller and...

Both market (e.g. auctions) and non-market mechanisms (e.g. lotteries and priority lists) are used to allocate a large amount of scarce public resources that produce large private benefits and small consumption externalities. I study a model in which the use of both market and non-market...

We characterize equilibria of oligopolistic markets where identical firms with constant marginal cost compete à la Cournot. For given maximal willingness to pay and maximal total demand, we first identify all combinations of equilibrium consumer surplus and industry profit that can arise from...

We present a theory of monopoly protection by means of entry in adjacent markets thathave a common customer base (i.e., envelopment). A firm dominant in its market enters a data richsecondary market and engages in predatory pricing and privacy-policy tying. We definethe latter as conditioning...