Comment Re:Why third-party candidacies don't work (Score 1) 291
Arrow proved that you can't make a perfect election system for more than two candidates. That doesn't mean every voting system that does exist is equally worthless.
Consider France, for instance. They use top-two runoffs, and they have more than two parties. While top-two doesn't really fit Arrow (as it's not a ranked ballot method), it probably doesn't pass the independence of irrelevant alternatives criterion, and so isn't a perfect method by Arrow's yardstick. Yet it works: it does permit multiple parties. That in itself means that some methods, while not perfect, are good enough.
Consider France, for instance. They use top-two runoffs, and they have more than two parties. While top-two doesn't really fit Arrow (as it's not a ranked ballot method), it probably doesn't pass the independence of irrelevant alternatives criterion, and so isn't a perfect method by Arrow's yardstick. Yet it works: it does permit multiple parties. That in itself means that some methods, while not perfect, are good enough.