This paper studies the welfare improvement properties of a market of allowances in an economy with a single type of externality. We show that thanks to the opening of such a market the Pareto optima can be decentralized as marginal pricing equilibria. However, the set of equilibria is much larger than this of Pareto optima. In order to discriminate the efficient equilibria we introduce a demand revealing mechanism tailored for this framework.
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Length: Date of creation: May 2007 Date of revision: Handle: RePEc:hal:cesptp:halshs-00155803_v1
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