We are pleased to help celebrate Roy Radner's 75th birthday, by issuing in one volume the papers that originally appeared in his honor in two special issues of Review of Economic Design (Vol. 6/2 and 6/3-4, 2001). Through his truly original ideas and lucid writing, Roy has influenced and guided the theory community for decades. Many colleagues and students have found their own work shaped and improved by Roy's wide-ranging curiosity, his encouragement, and his keen insights. In soliciting contributions to the Review of Economic Design Radner issues, we decided to approach his former students at the University of California, Berke­ ley, his former post-doctoral fellows at Bell Laboratories, and his published co­ authors. We express our sincere apology to any potential authors who fit these categories and whom we may have unintentionally failed to approach. Our job as editors of the Review of Economic Design Radner issues turned out to be easy, thanks to the enthusiastic response we received from authors and the quality of their submissions.

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On characterizing the probability of survival in a large competitive economy.- Uniqueness of Arrow-Debreu and Arrow-Radner equilibrium when utilities are additively separable.- Entry, productivity, and investment.- A model of Russia's "virtual economy".- Reaction to price changes and aspiration level adjustments.- Bargaining solutions with non-standard objectives.- Investment and concern for relative position.- Coordination of economic activity: An example.- Transversals, systems of distinct representatives, mechanism design, and matching.- Roy Radner and incentive theory.- Sufficient conditions for Nash implementation.- Majority rule with dollar voting.- Mediation and the Nash bargaining solution.- Public spending and optimal taxes without commitment.- Are "Anti-Folk Theorems" in repeated games nongeneric?.- Trust and social efficiencies.- Survival and the art of profit maximization.