We study the efficiency of standard auctions with interdependent values in which one of two bidders is perfectly informed of his value while the other is partially informed. The second-price auction, as well as English auction, has a unique ex-post equilibrium that yields efficient allocation....

Sellers often discriminate heterogeneous consumers with just a few products. This paper proposes an explanation for such coarse screening, based on consumer loss aversion. In our model, a seller offers a menu of bundles before a consumer learns his willingness to pay, and the consumer...