EFFICACY OF VOTE IN MULTI-SEATS ELECTION

We examined efficacy of vote in multi-seats elections. Efficacy of vot e has been calculated for single seat elections and several ways of ca lculation have been proposed. However, research for the multi-seats el ections is far behind. We made general considerations for the voters i n multi-seats elections. Multi-seats elections request new ideas for t he analysis. Especially, we concluded that the assumption that voters have utilities on the combination of winners than the independent winn ers is suitable. Under this assumption we calculated the efficacy for the two-seats three-candidates case with the simplest method of multin omial distribution model. We find that a vote is more effective in two -seats three-candidates case than in one-seat two-candidates case. We also find that among two-seats three-candidates elections limited vote system (one vote for one voter) is as effective as bloc vote system ( two votes for one voter).