In many trade environments - such as online markets - buyers fully learn their valuation for goods only after contracting. I characterize the buyer-optimal ex-ante information in such environments. Employing a classical sequential screening framework, I find that buyers prefer to remain...

This paper studies implementation in settings where agents take strategic actions that influence preferences. We show that such settings can arise in entry auctions for markets, and that the Vickery-Clarke-Groves Mechanism is not guaranteed to be truthful because of strategic actions. We thus...