The illustration below, adapted from the British campaign, illustrates why IRV is fairer.
How IRV works:
- On the ballot, each voter marks first choice as "1", second choice (if any) as "2", and so on.
- After vote, first choices are counted as usual.
- If no candidate gets more than 50% of the first-choice votes, the candidate with the fewest first-choice votes is eliminated and the second choice on each of those ballots is counted (i.e., instant run-off).
- This continues until one candidate gets more than 50% of the vote.