Maximization of Relative Social Welfare on Truthful Cardinal Voting Schemes

04/01/2019

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by   Sinya Lee, et al.

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Consider the the problem of maximizing the relative social welfare of truthful single-winner voting schemes with cardinal preferences compared to the classical range voting scheme. The range voting scheme is a simple and straightforward mechanism which deterministically maximizes the social welfare. However, the scheme that is known to be non-truthful and we studied the truthful mechanism that maximize the ratio of its expected social welfare to the social welfare achieved by the range voting scheme. We provide a scheme which achieve a ratio of Ω(m^-2/3) in this paper. It is proved that this bound is tight asymptotically and it is impossible to find a better voting scheme.