Tactical Voting - Influence of Voting System On Tactical Voting

Influence of Voting System On Tactical Voting

Tactical voting is highly dependent on the voting system being used. A tactical vote which improves a voter's satisfaction under one system could make no change or lead to a less-satisfying result under another system.

Moreover, although by the Gibbard-Satterthwaite theorem no deterministic single-winner voting system is immune to tactical voting in all cases, some systems' results are more resistant to tactical voting than others'. M. Badinski and R. Laraki, the inventors of the majority judgment system, performed an initial investigation of this question using a set of Monte Carlo simulated elections based on the results from a poll of the 2007 French presidential election which they had carried out using rated ballots. Comparing range voting, Borda count, plurality voting, approval voting with two different absolute approval thresholds, Condorcet voting, and majority judgment, they found that range voting had the highest (worst) strategic vulnerability, while their own system majority judgment had the lowest (best). Further investigation would be needed to be sure that this result remained true with different sets of candidates.

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