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Vulnerability of Selected Social Choice Methods to Strategic Voting

Piotr Pysiak

2006

( 6 )

https:/doi.org/

Abstract

Analysis of vulnerability of selected social choice methods to strategic voting is presented in the article. Selected methods are: plurality voting, the Borda count and approval voting. Applied procedure allowed strategic voting of unlimited number of voters. With each method voters knew the outcome of the sincere voting, consistent with their real preferences. 24 variants differed on voting parameters; for each variant 1000 random profiles of preferences have been analyzed. Results are different from expected.

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Research on voting methods: deduction, induction and simulation

Jacek Haman

2006

( 6 )

https:/doi.org/

Abstract

Social choice theory contains a number of deductive theorems on voting Methods' properties, in particular "non-existence" theorems, stating that there is no voting method complying particular rationality condition (as insusceptibility to strategic voting). These theorems, though theoretically important, have limited practical implications. When no voting method guarantees rational choice, the question of risk level connected with particular methods is raised. Such a question can be partly answered by means of computer simulations. Although simulations' results have no deductive quality, often they could be treated as statistical hypotheses. Even if statistical interpretation is impossible, simulations' results could be helpful in resolving practical problems.

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Collective and Individual Decisions

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