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On the Pareto Efficiency of a Socially Optimal Mechanism for Monopoly Regulation

Author

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  • Ismail Saglam

    (Department of Economics, Ipek University)

Abstract

Baron and Myerson (BM) (1982) propose an incentive-compatible, individually rational and ex-ante socially optimal direct-revelation mechanism to regulate a monopolistic firm with unknown costs. We show that their mechanism is not ex-post Pareto dominated by any other feasible direct-revelation mechanism. However, there also exist an uncountable number of feasible direct-revelation mechanisms that are not ex-post Pareto dominated by the BM mechanism. To investigate whether the BM mechanism remains in the set of ex-post undominated mechanisms when the Pareto axiom is slightly weakened, we introduce the epsilon-Pareto dominance. This concept requires the relevant dominance relationships to hold in the support of the regulator's beliefs everywhere but at a set of points of measure epsilon, which can be arbitrarily small. We show that a modification of the BM mechanism which always equates the price to the marginal cost can epsilon-Pareto dominate the BM mechanism at uncountably many regulatory environments, while it is never epsilon-Pareto dominated by the BM mechanism at any regulatory environment.

Suggested Citation

  • Ismail Saglam, 2016. "On the Pareto Efficiency of a Socially Optimal Mechanism for Monopoly Regulation," IPEK Working Papers 1601, Ipek University, Department of Economics, revised May 2016.
    • Handle: RePEc:ipk:wpaper:1601
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    References listed on IDEAS

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    1. Koray, Semih & Sertel, Murat R., 1990. "Pretend-but-perform regulation and limit pricing," European Journal of Political Economy, Elsevier, vol. 6(4), pages 451-472.
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    4. Harris Milton & Townsend, Robert M, 1981. "Resource Allocation under Asymmetric Information," Econometrica, Econometric Society, vol. 49(1), pages 33-64, January.
    5. Semih Koray & Ismail Saglam, 2005. "The Need for Regulating a Bayesian Regulator," Journal of Regulatory Economics, Springer, vol. 28(1), pages 5-21, July.
    6. Laffont, Jean-Jacques, 1994. "The New Economics of Regulation Ten Years After," Econometrica, Econometric Society, vol. 62(3), pages 507-537, May.
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    More about this item

    Keywords

    Monopoly; Regulation; Asymmetric Information; Pareto Efficiency;
    All these keywords.

    JEL classification:

    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design
    • L51 - Industrial Organization - - Regulation and Industrial Policy - - - Economics of Regulation

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