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Social choice on complex objects: A geometric approach

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  • Luigi Marengo
  • Simona Settepanella

Abstract

Marengo and Pasquali (2008) present a model of object construction in majority voting and show that, in general, by appropriate changes of such bundles, different social outcomes may be obtained. In this paper we extend and generalize this approach by providing a geometric model of individual preferences and social aggregation based on hyperplanes and their arrangements. As an application of this model we give a necessary condition for existence of a local social optimum. Moreover we address the question if a social decision rule depends also upon the number of voting agents. More precisely: are there social decision rules that can be obtained by an odd (even) number of voting agent which cannot be obtained by only three (two) voting agent? The answer is negative. Indeed three (or two) voting agent can produce all possible social decision rules.

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Paper provided by Laboratory of Economics and Management (LEM), Sant'Anna School of Advanced Studies, Pisa, Italy in its series LEM Papers Series with number 2008/28.

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Date of creation: 03 Dec 2008
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Handle: RePEc:ssa:lemwps:2008/28

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Keywords: Social choice; object construction power; agenda power; intransitive cycles; arrangements; graph theory.;

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  1. Luigi Marengo & Corrado Pasquali, 2010. "The construction of choice. A computational voting model," Economics Bulletin, AccessEcon, vol. 30(4), pages 3077-3087.
  2. Luigi Maregno & Corrado Pasquali, 2008. "A computational voting model," LEM Papers Series 2008/24, Laboratory of Economics and Management (LEM), Sant'Anna School of Advanced Studies, Pisa, Italy.
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