Template-type: ReDif-Paper 1.0 Author-Name: Bochet Olivier Author-workplace-name: METEOR Title: Nash Implementation with Lottery Mechanisms Abstract: Consider the problem of exact Nash Implementation of social choice correspondences. Define a lottery mechanism as a mechanism in which the planner can randomize on alternatives out of equilibrium while pure alternatives are always chosen in equilibrium. When preferences over alternatives are strict, we show that Maskin monotonicity (Maskin, 1999) is both necessary and sufficient for a social choice correspondence to be Nash implementable. We discuss how to relax the assumption of strict preferences. Next, we examine social choice correspondences with private components. Finally, we apply our method to the issue of voluntary implementation (Jackson and Palfrey, 2001). Keywords: microeconomics ; Series: Research Memoranda Creation-Date: 2005 Number: 036 File-URL: http://digitalarchive.maastrichtuniversity.nl/fedora/objects/guid:1218d82d-0362-4eb5-b495-0b3fae9fbb74/datastreams/ASSET1/content File-Format: application/pdf File-Size: 231995 Handle: RePEc:unm:umamet:2005036