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>As you could see, every voting system except First Past The Post is immune to the spoiler effect. That's not correct. IRV is also susceptible to spoilers. Let
by kilotaras 10y ago
>As you could see, every voting system except First Past The Post is immune to the spoiler effect.
That's not correct. IRV is also susceptible to spoilers. Lets start with two candidates A (slighty left) and B (farther right)
|-------A---B----|
1. A gets 61 vote, B gets 39.
2. A wins.
Now lets introduce a farther left candidate C, that is really close to A.
|-----C-A---B----|
Voting goes as follow.
1. C gets 31 vote, A gets 30, B gets 39.
2. A gets eliminated, his/her votes split between B and C.
3. Because C and B are close, most of the votes for B go to A who now wins the election.
- vacri 10y ago... how does A win the election in step 3 if A was knocked out in step 2? I'm also not following how you meant to write that (apparently a typo) - why would B get more votes than C when A is eliminated? Why would A's voters split evenly down the middle if C is closer to them?
- kilotaras 10y agoI've messed A and B at some point. Should be: A gets split, B wins. Introduction of another left candidate caused right one to win.