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Market equilibrium under separable, piecewise-linear, concave utilities

Published: 09 June 2011 Publication History

Abstract

We consider Fisher and Arrow--Debreu markets under additively separable, piecewise-linear, concave utility functions and obtain the following results. For both market models, if an equilibrium exists, there is one that is rational and can be written using polynomially many bits. There is no simple necessary and sufficient condition for the existence of an equilibrium: The problem of checking for existence of an equilibrium is NP-complete for both market models; the same holds for existence of an ε-approximate equilibrium, for ε = O(n−5). Under standard (mild) sufficient conditions, the problem of finding an exact equilibrium is in PPAD for both market models. Finally, building on the techniques of Chen et al. [2009a] we prove that under these sufficient conditions, finding an equilibrium for Fisher markets is PPAD-hard.

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    cover image Journal of the ACM
    Journal of the ACM  Volume 58, Issue 3
    May 2011
    122 pages
    ISSN:0004-5411
    EISSN:1557-735X
    DOI:10.1145/1970392
    Issue’s Table of Contents
    Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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    Publication History

    Published: 09 June 2011
    Accepted: 01 February 2011
    Revised: 01 January 2011
    Received: 01 December 2009
    Published in JACM Volume 58, Issue 3

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    Author Tags

    1. Arrow--Debreu market
    2. Fisher market
    3. Market equilibria
    4. PPAD
    5. piecewise-linear utilities

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