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Pareto Improvement in Monopoly Regulation Using Pre-Donation

Saglam, Ismail (2021): Pareto Improvement in Monopoly Regulation Using Pre-Donation.

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Revelation principle implies that given any admissible social welfare function, the outcome of Baron and Myerson's (1982) (BM) optimal direct-revelation mechanism under incentive constraints cannot be dominated by any other mechanism in expected utilities. However, since the expected total surplus varies with a change in the social welfare function, Pareto improvements should be possible if the monopolist and consumers can agree, by means of side payments that reveal no additional information to the regulator, on the use of an alternative social welfare function which would generate a lower expected deadweight loss. We check the validity of this intuition by integrating the BM mechanism with an induced cooperative bargaining model where unilateral pre-donation by consumers or the producer is allowed. Under this new mechanism producer's pre-donation in the ex-ante stage always leads to ex-ante Pareto improvement while a certain amount of it completely eliminates the expected deadweight loss. Moreover, if optimally designed in the interim stage, the producer's pre-donation may also lead under some cost parameters to interim (and also (ex-post) Pareto improvement. Consumers, on the other hand, have no incentive to make a unilateral pre-donation, nor to reverse the optimal pre-donation of the monopolist.

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