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Responsibility And Cross-Subsidization In Cost Sharing

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  • Hervé MOULIN
  • Yves SPRUMONT
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    Abstract

    We propose two axiomatic theories of cost sharing with the common premise that agents demand comparable –though perhaps different– commodities and are responsible for their own demand. Under partial responsibility the agents are not responsible for the asymmetries of the cost function: two agents consuming the same amount of output always pay the same price; this holds true under full responsibility only if the cost function is symmetric in all individual demands. If the cost function is additively separable, each agent pays her stand alone cost under full responsibility; this holds true under partial responsibility only if, in addition, the cost function is symmetric. By generalizing Moulin and Shenker's (1999) Distributivity axiom to cost-sharing methods for heterogeneous goods, we identify in each of our two theories a different serial method. The subsidy-free serial method (Moulin, 1995) is essentially the only distributive method meeting Ranking and Dummy. The cross-subsidizing serial method (Sprumont, 1998) is the only distributive method satisfying Separability and Strong Ranking. Finally, we propose an alternative characterization of the latter method based on a strengthening of Distributivity.

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    Bibliographic Info

    Paper provided by Centre interuniversitaire de recherche en économie quantitative, CIREQ in its series Cahiers de recherche with number 19-2002.

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    Length: 42 pages
    Date of creation: 2002
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    Handle: RePEc:mtl:montec:19-2002

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    Keywords: cost sharing; responsibility; serial methods; distributivity;

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