Penrose voting system and optimal quota

Details Penrose voting system and optimal quota Penrose voting system and optimal quota

2006-10-30

arxiv.org/abs/physics/0610271v1

Acta Physica Polonica B37, 3133-3143 (2006)

Physics

Physics and Society

12 pages, 2 figures

Scientific paper

Systems of indirect voting based on the principle of qualified majority can be analysed using the methods of game theory. In particular, this applies to the voting system in the Council of the European Union, which was recently a subject of a vivid political discussion. The a priori voting power of a voter measures his potential influence over the decisions of the voting body under a given decision rule. We investigate a system based on the law of Penrose, in which each representative in the voting body receives the number of votes (the voting weight) proportional to the square root of the population he or she represents. Here we demonstrate that for a generic distribution of the population there exists an optimal quota for which the voting power of any state is proportional to its weight. The optimal quota is shown to decrease with the number of voting countries.

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