Essays on Mechanism Design with Limited Communication and Congestion in Global Games Nenad Kos In the ...rst part of the dissertation I study mechanism design under limited communication. Chapter 1 o¤ers a detailed analysis of auctions with simultaneous limited communication. I solve for both welfare and revenue maximizing equilibria. The striking feature of optimal equilibria is that they are asymmetric even when the setup is ex ante completely symmetric. Asymmetry is twofold: in the

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... as well as in the mechanism. Furthermore, I show that with the same amount of communication even higher welfare can be achieved when communication is sequential. Sequential communication, in turn, is studied in detail in Chapter 2. I study a model in which the seller is selling an object to two potential buyers. Communication is restricted to binary questions the seller can ask. I characterize welfare maximizing equilibria of the model in which the seller commits to the total number of questions. The communication protocol that arises in such an equilibrium requires the seller to ask one of the buyers all the questions but one, followed by a single question to the other buyer.