Voting is not fair

Last week, I have read about voting. Kennth J. Arrow, an economist, says that there is no voting system is perfect. He gives the reasons that voting is fair when we are all three condition. One is non-dictaatorships. It means no one can force you to vote. Another is pareto efficiency, this means if people in society are all agree with some alternatives, that alternatives will become a social perferrence. The third is that voting has to be independent of irrelavant alternatives. Kennth mathematically shows that the dictator exists when we have more that three choices to vote. If we have more than three choices, whatever voting methods we use are not fair. This topic interests me because I usually thinks voting is the best way to find the best agreement.