Instant-runoff voting

Instant-runoff voting (IRV) is a type of ranked preferential voting method used in single-seat elections with more than two candidates. Instead of indicating support for only one candidate, voters in IRV elections can rank the candidates in order of preference. Ballots are initially counted for each voter's top choice. If a candidate has more than half of the vote based on first-choices, that candidate wins. If not, then the candidate with the fewest votes is eliminated. The voters who selected the defeated candidate as a first choice then have their votes added to the totals of their next choice. This process continues until a candidate has more than half of the votes. When the field is reduced to two, it has become an "instant runoff" that allows a comparison of the top two candidates head-to-head. Compared to plurality voting, IRV can reduce the effect of vote-splitting when multiple candidates earn support from like-minded voters.

"Ranked-choice voting" redirects here. For ranked voting systems in general, see Ranked voting.

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Instant-runoff voting is used in national elections in several countries. For example, it is used to elect members of the Australian House of Representatives and at least one house of all Australian state parliaments;[1] the President of India and members of legislative councils in India; the President of Ireland;[2] U.S. Representatives from the state of Maine;[3] and the Parliament in Papua New Guinea. The method is also used in local elections around the world, including New York City offices starting in 2021.[4] It is used by many political parties (for internal primaries/elections to elect party leaders and Presidential/Prime Ministerial candidates) and private associations, for various voting purposes such as that for choosing the Academy Award for Best Picture. IRV is described in Robert's Rules of Order Newly Revised as an example of preferential voting.[5]

IRV is also sometimes referred to as the alternative vote,[6] preferential voting,[7] or ranked-choice voting (RCV),[8] though these names are also used for other systems.[9][10][11][12][13] IRV can also be considered to be a single-winner variant of the single transferable vote system.

Terminology

Instant-runoff voting derives its name from the way the ballot count simulates a series of runoffs, similar to a two-round system, except that voter preferences do not change between rounds.[14] It is also known as the alternative vote, transferable vote, ranked-choice voting (RCV), single-seat ranked-choice voting, or preferential voting.[15]

Britons and New Zealanders generally call IRV the "alternative vote" (AV),[16][17] while in Canada it is called "Ranked Choice" or "Ranked Choice Voting".[18] Australians, who use IRV for most single winner elections, call IRV "preferential voting". American organizations that promote IRV (such as FairVote) sometimes identify IRV as "instant-runoff voting",[19] but jurisdictions using IRV such as San Francisco, California; Maine; and Minneapolis, Minnesota codified the term "ranked choice voting" in their laws.[20][21]

IRV occasionally is referred to as Ware's method after its inventor, American William Robert Ware. When the single transferable vote (STV) method is applied to a single-winner election, it becomes IRV; the government of Ireland has called IRV "proportional representation" based on the fact that the same ballot form is used to elect its president by IRV and parliamentary seats by STV, but IRV is a winner-take-all election method.[22] State law in South Carolina[23] and Arkansas[24] use "instant runoff" to describe the practice of having certain categories of absentee voters cast ranked-choice ballots before the first round of an election and counting those ballots in any subsequent runoff elections.

Variations
Example of optional preferential ballot paper
Example of full preferential ballot paper from the Australian House of Representatives

A number of IRV methods, varying as to ballot design and as to whether or not voters are obliged to provide a full list of preferences, are in use in different countries and local governments.

In an optional preferential voting system, voters can give a preference to as many candidates as they wish. They may make only a single choice, known as "bullet voting", and some jurisdictions accept an "X" as valid for the first preference. This may result in inactive ballots, where all of a voter's preferences are eliminated before a candidate is elected with a majority. Optional preferential voting is used for elections for the President of Ireland and the New South Wales Legislative Assembly.

In a full preferential voting method, voters are required to mark a preference for every candidate standing.[25] Ballots that do not contain a complete ordering of all candidates are in some jurisdictions considered spoilt or invalid, even if there are only two candidates standing. This can become burdensome in elections with many candidates and can lead to "donkey voting", in which some voters simply choose candidates at random or in top-to-bottom order, or a voter may order his or her preferred candidates and then fill in the remainder on a donkey basis. Full preferential voting is used for elections to the Australian federal parliament and for most State parliaments.

Other methods only allow marking preferences for a maximum of the voter's top three favorites, a form of partial preferential voting.[26]

History
Main article: History and use of instant-runoff voting

This method was considered by Condorcet as early as 1788, though only to condemn it, for its ability to eliminate a candidate preferred by a majority of voters.[27][28]

IRV can be seen as a special case of the single transferable vote method, which began use in the 1850s. It is historically known as Ware's method, due to the implementation of STV in 1871 at Harvard College by American architect William Robert Ware, who suggested it could also be used for single-winner elections.[29][30] Unlike the single transferable vote in multi-seat elections, however, the only ballot transfers are from backers of candidates who have been eliminated.

The first known use of an IRV-like method in a governmental election was in the 1893 general election in the Colony of Queensland (in present-day Australia).[31] The variant used for this election was a "contingent vote", where all candidates but two are eliminated in the first round. IRV in its true form was first used in Western Australia, in the 1908 state election. The Hare-Clark system was introduced for the Tasmanian House of Assembly at the 1909 state election.

IRV was introduced for federal (nationwide) elections in Australia after the Swan by-election in October 1918, in response to the rise of the conservative Country Party, representing small farmers. The Country Party split the non-Labor vote in conservative country areas, allowing Labor candidates to win without a majority of the vote. The conservative government of Billy Hughes introduced IRV (in Australia called "preferential voting") as a means of allowing competition between the Coalition parties without putting seats at risk. It was first used at the Corangamite by-election on 14 December 1918, and at a national level at the 1919 election.[32] IRV continued to benefit the Coalition until the 1990 election, when for the first time Labor obtained a net benefit from IRV.[33]

Election procedure

Process
Flowchart for counting IRV votes

In instant-runoff voting, as with other ranked election methods, each voter ranks the list of candidates in order of preference. Under a common ballot layout, the voter marks a '1' beside the most preferred candidate, a '2' beside the second-most preferred, and so forth, in ascending order. This is shown in the example Australian ballot above.

The mechanics of the process are the same regardless of how many candidates the voter ranks, and how many are left unranked. In some implementations, the voter ranks as many or as few choices as they wish, while in other implementations the voter is required to rank either all candidates, or a prescribed number of them.

In the initial count, the first preference of each voter is counted and used to order the candidates. Each first preference counts as one vote for the appropriate candidate. Once all the first preferences are counted, if one candidate holds a majority, that candidate wins. Otherwise the candidate who holds the fewest first preferences is eliminated. If there is an exact tie for last place in numbers of votes, various tie-breaking rules determine which candidate to eliminate. Some jurisdictions eliminate all low-ranking candidates simultaneously whose combined number of votes is fewer than the number of votes received by the lowest remaining candidates.

Ballots assigned to eliminated candidates are added to the totals of one of the remaining candidates based on the next preference ranked on each ballot. The process repeats until one candidate achieves a majority of votes cast for continuing candidates. Ballots on which all of a voter's ranked candidates are eliminated become inactive.

In Australian elections the allocation of preferences is performed efficiently in an unofficial tally at the polling booth by having the returning officer pre-declare the two most likely winners. (In the event that the returning officer is wrong the votes need to be recounted.)

Candidate order on the ballot paper
The Australian Electoral Commission holding a blind ballot to determine the order of candidates on the ballot paper, 2004

The common ways to list candidates on a ballot paper are alphabetically or by random lot. In some cases, candidates may also be grouped by political party. Alternatively, Robson Rotation involves randomly changing candidate order for each print run.

Party strategies

Where preferential voting is used for the election of an assembly or council, parties and candidates often advise their supporters on their lower preferences, especially in Australia where a voter must rank all candidates to cast a valid ballot. This can lead to "preference deals", a form of pre-election bargaining, in which smaller parties agree to direct their voters in return for support from the winning party on issues critical to the small party. It can also sometimes lead to joint campaigning between candidates with similar platforms. However, these strategies rely on the assumption that supporters of a party or candidate are receptive to advice on the other preferences on their ballot.

Counting logistics

Most IRV elections historically have been tallied by hand, including in elections to Australia's House of Representatives and most state governments. In the modern era, voting equipment can be used to administer the count either partially or fully.

In Australia, the returning officer now usually declares the two candidates that are most likely to win each seat. The votes are always counted by hand at the polling booth monitored by scrutineers from each candidate. The first part of the count is to record the first choice for all candidates. Votes for candidates other than the two likely winners are then allocated to them in a second pass. The whole process of counting the votes by hand and allocating preferences is typically completed within two hours on election night at a cost of $7.68 per elector in 2010 to run the entire election.[34]

(The declaration by the returning officer is simply to optimize the counting process. In the unlikely event that the returning officer is wrong and a third candidate wins, then the votes would simply have to be counted a third time.)[35]

Ireland in its presidential elections has several dozen counting centers around the nation. Each center reports its totals and receives instructions from the central office about which candidate or candidates to eliminate in the next round of counting based on which candidate is in last place. The count typically is completed the day after the election, as in 1997.[36]

In the United States, nearly all jurisdictions that use this format -- like Maine and cities like Oakland and San Francisco, administer IRV elections on voting machines, with optical scanning machines recording preferences and software tallying the IRV algorithm as soon as ballots are tallied.[37] In its first use of IRV in 2009, Minneapolis, Minnesota, tallied first choices on optical scan equipment at the polls and then used a central hand-count for the IRV tally, but has since administered elections without hand tallies[38] Portland, Maine in 2011 used its usual voting machines to tally first choice at the polls, then a central scan with different equipment if an IRV tally was necessary.[39]

Examples

Some examples of IRV elections are given below. The first two (fictional elections) demonstrate the principle of IRV. The others offer examples of the results of real elections.

Five voters, three candidates

A simple example is provided in the accompanying table. Three candidates are running for election, Bob, Bill and Sue. There are five voters, "a" through "e". The voters each have one vote. They rank the candidates first, second and third in the order they prefer them. To win, a candidate must have a majority of vote; that is, three or more.

In Round 1, the first-choice rankings are tallied, with the results that Bob and Sue both have two votes and Bill has one. No candidate has a majority, so a second "instant runoff" round is required. Since Bill is in bottom place, he is eliminated. The ballot from any voter who ranked Bill first (in this example solely voter "c" ) gets modified as follows: the original 2nd choice candidate for that voter becomes their new 1st choice, and their original 3rd choice becomes their new 2nd choice. This results in the Round 2 votes as seen below. This gives Sue 3 votes, which is a majority.

Round 1 Round 2
Candidateabcde VotesabcdeVotes
Bob123122122122
Sue312312211213
Bill231231

Tennessee capital election

Most instant-runoff voting elections are won by the candidate who leads in first-choice rankings. In such cases, IRV chooses the same winner as first-past-the-post voting. Some IRV elections are won by a candidate who finishes second after the first-round count. In this case, IRV chooses the same winner as a two-round system if all voters were to vote again and maintain their same preferences. A candidate may also win who is in third place or lower after the first count, but gains majority support (among the non-eliminated candidates) in the final round. In such cases, IRV would choose the same winner as a multi-round method that eliminated the last-place candidate before each new vote, assuming all voters kept voting and maintained their same preferences. Here is an example of this last case.

Imagine that Tennessee is having an election on the location of its capital. The population of Tennessee is concentrated around its four major cities, which are spread throughout the state. For this example, suppose that the entire electorate lives in these four cities and that everyone wants to live as near to the capital as possible.

The candidates for the capital are:

  • Memphis, the state's largest city, with 42% of the voters, but located far from the other cities
  • Nashville, with 26% of the voters, near the center of the state
  • Knoxville, with 17% of the voters
  • Chattanooga, with 15% of the voters

The preferences of the voters would be divided like this:

42% of voters
(close to Memphis)		 26% of voters
(close to Nashville)		 15% of voters
(close to Chattanooga)		 17% of voters
(close to Knoxville)
  1. Memphis
  2. Nashville
  3. Chattanooga
  4. Knoxville
  1. Nashville
  2. Chattanooga
  3. Knoxville
  4. Memphis
  1. Chattanooga
  2. Knoxville
  3. Nashville
  4. Memphis
  1. Knoxville
  2. Chattanooga
  3. Nashville
  4. Memphis

It takes three rounds to determine a winner in this election.

Round 1 – In the first round no city gets a majority:

Votes in round/
City Choice		1st
Memphis42%
Nashville26%
Knoxville17%
Chattanooga15%

If one of the cities had achieved a majority vote (more than half), the election would end there. If this were a first-past-the-post election, Memphis would win because it received the most votes. But IRV does not allow a candidate to win on the first round without having an absolute majority of the vote. While 42% of the electorate voted for Memphis, 58% of the electorate voted against Memphis in this first round.

Round 2 – In the second round of tabulation, we remove the city with the least first-place support from consideration. Chattanooga received the lowest number of votes in the first round, so it is eliminated. The ballots that listed Chattanooga as first choice are added to the totals of the second-choice selection on each ballot. Everything else stays the same.

Chattanooga's 15% of the total votes are added to the second choices selected by the voters for whom that city was first-choice (in this example Knoxville):

Votes in round/
City Choice		1st2nd
Memphis42%42%
Nashville26%26%
Knoxville17%32%
Chattanooga15%

In the first round, Memphis was first, Nashville was second and Knoxville was third. With Chattanooga eliminated and its votes redistributed, the second round finds Memphis still in first place, followed by Knoxville in second and Nashville has moved down to third place. This example however makes the unlikely assumption that all voters who selected a certain city first would rank the subsequent cities in the same order. In reality, some first-choice supporters of Chattanooga may have had Nashville as their second choice rather than Knoxville, resulting in Knoxville's elimination in Round 3.

Round 3 – No city yet has secured a majority of votes, so we move to the third round with the elimination of Nashville, and it becomes a contest between Memphis and Knoxville.

As in the second round with Chattanooga, all of the ballots currently counting for Nashville are added to the totals of Memphis or Knoxville based on which city is ranked next on that ballot. In this example the second-choice of the Nashville voters is Chattanooga, which is already eliminated. Therefore, the votes are added to their third-choice: Knoxville.

The third round of tabulation yields the following result:

Votes in round/
City Choice		1st2nd3rd
Memphis42%42%42%
Nashville26%26%
Knoxville17%32%58%
Chattanooga15%

Result: Knoxville, which was running third in the first tabulation, has moved up from behind to take first place in the third and final round. The winner of the election is Knoxville. However, if 6% of voters in Memphis were to put Nashville first, the winner would be Nashville, a preferable outcome for voters in Memphis. This is an example of potential tactical voting, though one that would be difficult for voters to carry out in practice. Also, if 17% of voters in Memphis were to stay away from voting, the winner would be Nashville. This is an example of IRV failing the participation criterion.

For comparison, note that traditional first-past-the-post voting would elect Memphis, even though most citizens consider it the worst choice, because 42% is larger than any other single city. As Nashville is a Condorcet winner, Condorcet methods would elect Nashville. A two-round method would have a runoff between Memphis and Nashville where Nashville would win, too.

2014 Prahran election (Victoria)

A good real-life example of IRV producing a result which differs from what would be expected of first-past-the-post or the two-round voting system is the result for the seat of Prahran at the 2014 Victorian state election. In this instance, the candidate who finished third (Greens candidate Sam Hibbins) in the primary vote went on to win the seat on the back of favourable preferences from the other two minor parties and independents, narrowly beating the second-ranked candidate (Labor candidate Neil Pharaoh) by 31 votes and the first-ranked candidate (Liberal candidate Clem Newton-Brown) by 277 votes. It was not until the final round of counting that one of the two remaining candidates (Hibbins) had more than 50% of the total vote.[40]

Candidate[40]Primary VoteFirst RoundSecond RoundThird RoundFourth RoundFifth RoundSixth Round
Clem Newton-Brown (LIB)16,58244.8%16,59216,64416,72616,84317,07618,36349.6%
Neil Pharaoh (ALP)9,58625.9%9,5939,6399,6909,7589,948
Sam Hibbins (GRN)9,16024.8%9,1719,2189,3109,4039,97918,64050.4%
Eleonora Gullone (AJP)8372.3%860891928999
Alan Walker (FFP)2820.8%283295
Jason Goldsmith (IND)2470.7%263316349
Steve Stefanopoulos (IND)2270.6%241
Alan Menadue (IND)820.2%
Total37,003100%

2009 Burlington mayoral election
Burlington mayoral election, 2009 (Round by round analysis of votes)
Candidates 1st Round 2nd Round 3rd Round
Candidate Party Votes ± Votes ± Votes ±
Bob Kiss Progressive 2585 +2585 2981 +396 4313 +1332
Kurt Wright Republican 2951 +2951 3294 +343 4061 +767
Andy Montroll Democrat 2063 +2063 2554 +491 0 −2554
Dan Smith Independent 1306 +1306 0 −1306
James Simpson Green 35 +35 0 −35
Write-in 36 +36 0 −36
EXHAUSTED PILE 4 +4 151 +147 606 +455
TOTALS[41] 8980 +8980

Unlike Burlington's first IRV mayoral election in 2006, the IRV winner in 2009 (Bob Kiss) was neither the same as the plurality winner (Kurt Wright) nor the Condorcet winner (Andy Montroll).[42][43][44][45] Because of the post-election controversy,[46] IRV was repealed in 2010 by a vote of 52% to 48%.[47][48]

The organization FairVote, which advocates for IRV, claimed the election as a success, citing three reasons (1) it prevented the election of the presumed winner under a plurality system by avoiding the effect of vote-splitting between the other candidates, (2) 99.99% of the ballots were valid suggesting that voters handled the system without difficulty, and (3) "contributed to producing a campaign among four serious candidates that was widely praised for its substantive nature."[49] However, the election was considered a failure by advocates of the Condorcet winner, who point out that "in a head to head election, Andy Montroll should have beaten Bob Kiss by a 7.8% margin".[43][44][50]

In this case, a mutual majority causes a lock-out of a sufficiently-large minority. In examples where a smaller minority would break the lock-out and would change the winner in their favor, the participation criterion is violated. Wright voters were 40%, versus voters who placed Montroll and Kiss above Wright at 51.5%. That means a lot of Wright voters would have had to stay home for their demographic to matter at all, causing a participation criterion failure.

Burlington mayoral election, 2009 (Summary analysis)
Party Candidate Maximum
Round		 Maximum
Votes		 Share in
Maximum
Round		 Maximum Votes
First Round VotesTransfer Votes
Progressive Bob Kiss 3 4,313 48.0%
​​
Republican Kurt Wright 3 4,061 45.2%
​​
Democratic Andy Montroll 2 2,554 28.4%
​​
Independent Dan Smith 1 1,306 14.5%
​​
Green James Simpson 1 35 0.4%
​​
Write-in 1 36 0.4%
​​
Exhausted votes 606 6.7%
​​

1990 Irish presidential election
Irish presidential election, 1990[51]
Candidate Round 1 Round 2
Mary Robinson 612,265(38.9%) 817,830(51.6%)
Brian Lenihan 694,484(43.8%) 731,273(46.2%)
Austin Currie 267,902(16.9%) —
Exhausted ballots 9,444(0.6%) 34,992(2.2%)
Total 1,584,095(100%) 1,584,095(100%)

The result of the 1990 Irish presidential election provides an example of how instant-runoff voting can produce a different result from first-past-the-post voting. The three candidates were Brian Lenihan of the traditionally dominant Fianna Fáil party, Austin Currie of Fine Gael, and Mary Robinson, nominated by the Labour Party and the Workers' Party. After the first round, Lenihan had the largest share of the first-choice rankings (and hence would have won a first-past-the-post vote), but no candidate attained the necessary majority. Currie was eliminated and his votes reassigned to the next choice ranked on each ballot; in this process, Robinson received 82% of Currie's votes, thereby overtaking Lenihan.

Voting method criteria

Scholars rate voting methods using mathematically-derived voting method criteria, which describe desirable features of a method. No ranked-preference method can meet all of the criteria, because some of them are mutually exclusive, as shown by statements such as Arrow's impossibility theorem and the Gibbard–Satterthwaite theorem.

Many of the mathematical criteria by which voting methods are compared were formulated for voters with ordinal preferences. If voters vote according to the same ordinal preferences in both rounds, criteria can be applied to two-round systems of runoffs, and in that case, each of the criteria failed by IRV is also failed by the two-round system as they relate to automatic elimination of trailing candidates. Partial results exist for other models of voter behavior in the two-round method: see the two-round system article's criterion compliance section for more information.

Satisfied criteria

Condorcet loser criterion

The Condorcet loser criterion states that "if a candidate would lose a head-to-head competition against every other candidate, then that candidate must not win the overall election". IRV (like all voting methods with a final runoff round) meets this criterion, since the Condorcet loser cannot win a runoff, however IRV can still elect the "second-worst" candidate, when the two worst candidates are the only ones remaining in the final round.[52] However, this is unlikely.

Independence of clones criterion

The independence of clones criterion states that "the election outcome remains the same even if an identical candidate who is equally preferred decides to run." IRV meets this criterion.[53]

Later-no-harm criterion

The later-no-harm criterion states that "if a voter alters the order of candidates lower in his/her preference (e.g. swapping the second and third preferences), then that does not affect the chances of the most preferred candidate being elected".

Majority criterion

The majority criterion states that "if one candidate is preferred by an absolute majority of voters, then that candidate must win".

Mutual majority criterion

The mutual majority criterion states that "if an absolute majority of voters prefer every member of a group of candidates to every candidate not in that group, then one of the preferred group must win". Note that this is satisfied because when all but one candidate that a mutual majority prefer is eliminated, the votes of the majority all flow to the remaining candidate, in contrast to FPTP, where the majority would be treated as separate small groups.

Resolvability criterion

The resolvability criterion states that "the probability of an exact tie must diminish as more votes are cast".

Non-satisfied criteria
Diagrams showing the non-monotonicity of IRV compared to plurality voting, as well as approval voting and Condorcet methods (both of which give similar results to the first column); Each point represents the winner of a simulated election with the center of opinion at that point; In IRV, shifting the center of opinion towards a candidate can make that candidate lose, while shifting away from a candidate can make that candidate win.

Condorcet winner criterion

The Condorcet winner criterion states that "if a candidate would win a head-to-head competition against every other candidate, then that candidate must win the overall election". It is incompatible with the later-no-harm criterion, so IRV does not meet this criterion.

IRV is more likely to elect the Condorcet winner than plurality voting and traditional runoff elections. The California cities of Oakland, San Francisco and San Leandro in 2010 provide an example; there were a total of four elections in which the plurality-voting leader in first-choice rankings was defeated, and in each case the IRV winner was the Condorcet winner, including a San Francisco election in which the IRV winner was in third place in first choice rankings.[54]

Systems which fail Condorcet but pass mutual majority can exclude voters outside the mutual majority from the vote, essentially becoming an election between the mutual majority. IRV demonstrates this exclusion of up to 50% of voters, notably in the 2009 Burlington, Vermont mayoral election where the later rounds became a runoff between the mutual majority of voters favoring Andy Montroll and Bob Kiss. This can recurse: if a mutual majority exists within the mutual majority, then the majority becomes a collegiate over the minority, and the inner mutual majority solely decides the votes of this collegiate.

Consistency criterion

The consistency criterion states that if dividing the electorate into two groups and running the same election separately with each group returns the same result for both groups, then the election over the whole electorate should return this result. IRV, like all preferential voting methods which are not positional, does not meet this criterion.

Independence of irrelevant alternatives criterion

The independence of irrelevant alternatives criterion states that "the election outcome remains the same even if a candidate who cannot win decides to run." In the general case, instant-runoff voting can be susceptible to strategic nomination: whether or not a candidate decides to run at all can affect the result even if the new candidate cannot themselves win.[55] This is much less likely to happen than under plurality.

Monotonicity criterion

Further information: Monotonicity criterion § Instant-runoff voting and the two-round system are not monotonic

The monotonicity criterion states that "a voter can't harm a candidate's chances of winning by voting that candidate higher, or help a candidate by voting that candidate lower, while keeping the relative order of all the other candidates equal." Allard[56] claims failure is unlikely, at a less than 0.03% chance per election. Some critics[57] argue in turn that Allard's calculations are wrong and the probability of monotonicity failure is much greater, at 14.5% under the impartial culture election model in the three-candidate case, or 7–10% in the case of a left-right spectrum. Lepelley et al. find a 2%–5% probability of monotonicity failure under the same election model as Allard.[58] The diagram shows the non-monotonicity of IRV, where moving the center of opinion away from a candidate can help that candidate win, and moving the center of opinion towards a candidate can cause that candidate to lose.

Participation criterion

The participation criterion states that "the best way to help a candidate win must not be to abstain".[59] IRV does not meet this criterion: in some cases, the voter's preferred candidate can be best helped if the voter does not vote at all.[60] Depankar Ray finds a 50% probability that, when IRV elects a different candidate than Plurality, some voters would have been better off not showing up.[61]

Reversal symmetry criterion

The reversal symmetry criterion states that "if candidate A is the unique winner, and each voter's individual preferences are inverted, then A must not be elected". IRV does not meet this criterion: it is possible to construct an election where reversing the order of every ballot paper does not alter the final winner.[60]

Comparison to other voting methods

Comparison of mechanics

Instant-runoff voting is one of many ranked ballot methods. For example, the elimination of the candidate with the most last-place rankings, rather than the one with the fewest first-place rankings, is called Coombs' method, and universal assignment of numerical values to each rank is used in the Borda count method. A chart in the article on the Schulze method compares various ranked ballot methods.

Comparison to first-past-the-post

At the Australian federal election in September 2013, 135 out of the 150 House of Representatives seats (or 90 percent) were won by the candidate who led on first preferences. The other 15 seats (10 percent) were won by the candidate who placed second on first preferences.[62]

Resistance to tactical voting
See also: Tactical voting § Instant runoff voting

The Gibbard–Satterthwaite theorem demonstrates that no (deterministic, non-dictatorial) voting method using only the preference rankings of the voters can be entirely immune from tactical voting. This implies that IRV is susceptible to tactical voting in some circumstances.

Research concludes that IRV is one of the least manipulable voting methods, with theorist Nicolaus Tideman noting that, "alternative vote is quite resistant to strategy"[63] and Australian political analyst Antony Green dismissing suggestions of tactical voting.[64] James Green-Armytage tested four ranked-choice methods, and found the alternative vote to be the second-most-resistant to tactical voting, though it was beaten by a class of AV-Condorcet hybrids, and did not resist strategic withdrawal by candidates well.[65]

By not meeting the monotonicity, Condorcet winner, and participation criteria, IRV permits forms of tactical voting when voters have sufficient information about other voters' preferences, such as from accurate pre-election polling.[66] FairVote mentions that monotonicity failure can lead to situations where "Having more voters rank [a] candidate first, can cause [them] to switch from being a winner to being a loser."[67] That assessment is accurate, although it only happens in particular situations. The change in lower candidates is important: whether votes are shifted to the leading candidate, shifted to a fringe candidate, or discarded altogether is of no importance.

Tactical voting in IRV seeks to alter the order of eliminations in early rounds, to ensure that the original winner is challenged by a stronger opponent in the final round. For example, in a three-party election where voters for both the left and right prefer the centrist candidate to stop the "enemy" candidate winning, those voters who care more about defeating the "enemy" than electing their own candidate may cast a tactical first preference vote for the centrist candidate.

The 2009 mayoral election in Burlington, Vermont provides an example in which strategy theoretically could have worked but would have been unlikely in practice. In that election, most supporters of the candidate who came in second (a Republican who led in first choices) preferred the Condorcet winner, a Democrat, to the IRV winner, the Progressive Party nominee. If 371 (12.6%) out of the 2951 backers of the Republican candidate (those who also preferred the Democrat over the Progressive candidate for mayor) had insincerely raised the Democrat from their second choice to their first (not changing their rankings relative to their least favorite candidate, the Progressive), the Democrat would then have advanced to the final round (instead of their favorite), defeated any opponent, and proceeded to win the IRV election.[66] This is an example of potential voter regret in that these voters who sincerely ranked their favorite candidate as first, find out after the fact that they caused the election of their least favorite candidate, which can lead to the voting tactic of compromising. Yet because the Republican led in first choices and only narrowly lost the final instant runoff, his backers would have been highly unlikely to pursue such a strategy.

Spoiler effect

The spoiler effect is when a difference is made to the anticipated outcome of an election due to the presence on the ballot paper of a candidate who (predictably) will lose. Most often this is when two or more politically similar candidates divide the vote for the more popular end of the political spectrum. That is, each receives fewer votes than a single opponent on the unpopular end of the spectrum who is disliked by the majority of voters but who wins from the advantage that, on that unpopular side, they are unopposed.

Proponents of IRV claim that IRV eliminates the spoiler effect,[68][69][70][71] since IRV makes it safe to vote honestly for marginal parties: Under a plurality method, voters who sympathize most strongly with a marginal candidate are strongly encouraged to instead vote for a more popular candidate who shares some of the same principles, since that candidate has a much greater chance of being elected and a vote for the marginal candidate will not result in the marginal candidate's election. An IRV method reduces this problem, since the voter can rank the marginal candidate first and the mainstream candidate second; in the likely event that the fringe candidate is eliminated, the vote is not wasted but is transferred to the second preference.

However, when the third party candidate is more competitive, they can still act as a spoiler under IRV,[72][73][74][75][76][77] by taking away first-choice votes from the more mainstream candidate until that candidate is eliminated, and then that candidate's second-choice votes helping a more-disliked candidate to win. In these scenarios, it would have been better for the third party voters if their candidate had not run at all (spoiler effect), or if they had voted dishonestly, ranking their favorite second rather than first (favorite betrayal.)[78][79]

For example, in the 2009 Burlington, Vermont mayoral election, if the Republican candidate who lost in the final instant runoff had not run, the Democratic candidate would have defeated the winning Progressive candidate. In that sense, the Republican candidate was a spoiler even though leading in first choice support.[66][80]

The Tideman alternative method avoids this by first eliminating all candidates not in the Smith set or Schwartz set, then performing exactly one round of IRV, repeating this process until a Condorcet candidate appears. Other Condorcet methods also elect from these sets using different rules; Tideman's is the most functionally-similar to IRV.

In practice, IRV does not seem to discourage candidacies. In Australia's House of Representatives elections in 2007, for example, the average number of candidates in a district was seven, and at least four candidates ran in every district; notwithstanding the fact that Australia only has two major political parties. Every seat was won with a majority of the vote, including several where results would have been different under plurality voting.[81] A study of ballot image data found that all of the 138 RCV elections held in four Bay Area cities in California elected the Condorcet winner, including many with large fields of candidates and 46 where multiple rounds of counting were required to determine a winner.[82]

Proportionality

IRV is not a proportional voting method. Like all winner-take-all voting methods, IRV tends to exaggerate the number of seats won by the largest parties; small parties without majority support in any given constituency are unlikely to earn seats in a legislature, although their supporters will be more likely to be part of the final choice between the two strongest candidates.[83] A simulation of IRV in the 2010 UK general election by the Electoral Reform Society concluded that the election would have altered the balance of seats among the three main parties, but the number of seats won by minor parties would have remained unchanged.[84]

Australia, a nation with a long record of using IRV for the election of legislative bodies, has had representation in its parliament broadly similar to that expected by plurality methods. Medium-sized parties, such as the National Party of Australia, can co-exist with coalition partners such as the Liberal Party of Australia, and can compete against it without fear of losing seats to other parties due to vote splitting, although generally in practice these two parties only compete against each other when a sitting member of the coalition leaves Parliament.[85] IRV is more likely to result in legislatures where no single party has an absolute majority of seats (a hung parliament), but does not generally produce as fragmented a legislature as a fully proportional method, such as is used for the House of Representatives of the Netherlands, where coalitions of numerous small parties are needed for a majority.

Costs

The costs of printing and counting ballot papers for an IRV election are no different from those of any other method using the same technology. However, the more-complicated counting system may encourage officials to introduce more advanced technology, such as software counters or electronic voting machines. Pierce County, Washington, election officials outlined one-time costs of $857,000 to implement IRV for its elections in 2008, covering software and equipment, voter education and testing.[86]

Because it does not require two separate votes, IRV is assumed to cost less than two-round primary/general or general/runoff election methods.[87] However, in 2009, the auditor of Pierce County reported that the ongoing costs of the system were not necessarily balanced by the costs of eliminating runoffs for most county offices, because those elections may be needed for other offices not elected by IRV.[88] Other jurisdictions have reported immediate cost savings.[89]

Australian elections are counted by hand. The 2010 federal election cost a total of $7.68 per elector of which only a small proportion is the actual counting of votes.[34] Counting is now normally performed in a single pass at the polling center as described above.

The perceived costs or cost savings of adopting an IRV method are commonly used by both supporters and critics. In the 2011 referendum on the Alternative Vote in the UK, the NOtoAV campaign was launched with a claim that adopting the method would cost £250 million; commentators argued that this headline figure had been inflated by including £82 million for the cost of the referendum itself, and a further £130 million on the assumption that the UK would need to introduce electronic voting systems, when ministers had confirmed that there was no intention of implementing such technology, whatever the outcome of the election.[90] Automated vote counting is seen by some to have a greater potential for election fraud;[91] IRV supporters counter these claims with recommended audit procedures,[92] or note that automated counting is not required for the method at all.

Negative campaigning

John Russo, Oakland City Attorney, argued in the Oakland Tribune on 24 July 2006 that "Instant runoff voting is an antidote to the disease of negative campaigning. IRV led to San Francisco candidates campaigning more cooperatively. Under the method, their candidates were less likely to engage in negative campaigning because such tactics would risk alienating the voters who support 'attacked' candidates", reducing the chance that they would support the attacker as a second or third choice.[93][94]

In 2013–2014, the Rutgers-Eagleton Poll surveyed more than 4,800 likely voters in 21 cities after their local city elections—half in cities with IRV elections and 14 in control cities selected by project leaders Caroline Tolbert of the University of Iowa and Todd Donovan of Western Washington University. Among findings, respondents in IRV cities reported candidates spent less time criticizing opponents than in cities that did not use IRV. In the 2013 survey, for example, 5% of respondents said that candidates criticized each other "a great deal of the time" as opposed to 25% in non-IRV cities. An accompanying survey of candidates reported similar findings.[95]

Internationally, Benjamin Reilly suggests instant-runoff voting eases ethnic conflict in divided societies.[96] This feature was a leading argument for why Papua New Guinea adopted instant-runoff voting.[97] However, Lord Alexander's objections to the conclusions of the British Independent Commission on the Voting System's report[98] cites the example of Australia saying "their politicians tend to be, if anything, more blunt and outspoken than our own".

Plural voting

Some critics of IRV misunderstand the tally to believe that some voters get more votes than other voters. In Ann Arbor, Michigan, for example, arguments over IRV in letters to newspapers included the belief that IRV "gives minority candidate voters two votes", because some voters' ballots may count for their first choice in the first round and a lesser choice in a later round.[99] The argument that IRV represents plural voting is sometimes used in arguments over the "fairness" of the method, and has led to several legal challenges in the United States. In every instance, state and federal judges have rejected this argument.

The argument was addressed and rejected by a Michigan court in 1975; in Stephenson v. the Ann Arbor Board of City Canvassers, the court held "majority preferential voting" (as IRV was then known) to be in compliance with the Michigan and United States constitutions, writing:[100]

Under the "M.P.V. System", however, no one person or voter has more than one effective vote for one office. No voter's vote can be counted more than once for the same candidate. In the final analysis, no voter is given greater weight in his or her vote over the vote of another voter, although to understand this does require a conceptual understanding of how the effect of a "M.P.V. System" is like that of a run-off election. The form of majority preferential voting employed in the City of Ann Arbor's election of its Mayor does not violate the one-man, one-vote mandate nor does it deprive anyone of equal protection rights under the Michigan or United States Constitutions.

The same argument was advanced in opposition to IRV in Maine. Governor Paul LePage claimed, ahead of the 2018 primary elections, that IRV would result in "one person, five votes", as opposed to "one person, one vote".[101] In litigation following the results of the 2018 election for Maine's 2nd congressional district, Representative Bruce Poliquin claimed that IRV allowed his opponents to "cast ballots for three different candidates in the same election".[102] Federal judge Lance Walker rejected this claim, and the 1st circuit court denied Poliquin's emergency appeal, leading to Poliquin dropping his claim.[103]

Invalid ballots and incomplete ballots

Because the ballot marking is more complex, there can be an increase in spoiled ballots. In Australia, voters are required to write a number beside every candidate,[104] and the rate of spoiled ballots can be five times higher than plurality voting elections.[105] Since Australia has compulsory voting, however, it is difficult to tell how many ballots are deliberately spoiled.[106] Where complete rankings are not required, a ballot may become inactive if none of the ranked choices on that ballot advance to the next round.

Most jurisdictions with IRV do not require complete rankings and may use columns to indicate preference instead of numbers. In American elections with IRV, more than 99% of voters typically cast a valid ballot.[107]

A 2015 study of four local U.S. elections that used IRV found that inactive ballots occurred often enough in each of them that the winner of each election did not receive a majority of votes cast in the first round. The rate of inactive ballots in each election ranged from a low of 9.6% to a high of 27.1%.[108] As one point of comparison, the number of votes cast in the 190 regularly scheduled primary runoff elections for the U.S House and U.S. Senate from 1994 to 2016 decreased from the initial primary on average by 39%, according to a 2016 study by FairVote.[109]

Robert's Rules of Order

In the United States, the sequential elimination method used by IRV is described in Robert's Rules of Order Newly Revised[5] as an example of preferential voting:

The term preferential voting refers to any of a number of voting methods by which, on a single ballot when there are more than two possible choices, the second or less-preferred choices of voters can be taken into account if no candidate or proposition attains a majority. While it is more complicated than other methods of voting in common use, and is not a substitute for the normal procedure of repeated balloting until a majority is obtained, preferential voting is especially useful and fair in an election by mail if it is impractical to take more than one ballot. In such cases, it makes possible a more representative result than under a rule that a plurality shall elect ... Preferential voting has many variations. One method is described here by way of illustration.[110]

The instant-runoff voting method is then detailed.[111] Robert's Rules continues:

The system of preferential voting just described should not be used in cases where it is possible to follow the normal procedure of repeated balloting until one candidate or proposition attains a majority. Although this type of preferential ballot is preferable to an election by plurality, it affords less freedom of choice than repeated balloting, because it denies voters the opportunity of basing their second or lesser choices on the results of earlier ballots, and because the candidate or proposition in last place is automatically eliminated and may thus be prevented from becoming a compromise choice.[112]

Two other books on American parliamentary procedure take a similar stance, disapproving of plurality voting and describing preferential voting as an option, if authorized in the bylaws, when repeated balloting is impractical: The Standard Code of Parliamentary Procedure[113] and Riddick's Rules of Procedure.[114]

Global use
Main article: History and use of instant-runoff voting § Use by country

Similar methods

Runoff voting

The term instant runoff voting is derived from the name of a class of voting methods called runoff voting. In runoff voting voters do not rank candidates in order of preference on a single ballot. Instead a similar effect is achieved by using multiple rounds of voting. All multi-round runoff voting methods allow voters to change their preferences in each round, incorporating the results of the prior round to influence their decision. This is not possible in IRV, as participants vote only once, and this prohibits certain forms of tactical voting that can be prevalent in 'standard' runoff voting.

Exhaustive ballot

A method closer to IRV is the exhaustive ballot. In this method—one familiar to fans of the television show American Idol—one candidate is eliminated after each round, and many rounds of voting are used, rather than just two.[115] Because holding many rounds of voting on separate days is generally expensive, the exhaustive ballot is not used for large-scale, public elections.

Two-round methods

The simplest form of runoff voting is the two-round system, which typically excludes all but two candidates after the first round, rather than gradually eliminating candidates over a series of rounds. Eliminations can occur with or without allowing and applying preference votes to choose the final two candidates. A second round of voting or counting is only necessary if no candidate receives an overall majority of votes. This method is used in Mali, France and the Finnish and Slovenian presidential election.

Contingent vote
Top-two IRV

The contingent vote, also known as Top-two IRV, or batch-style, is the same as IRV except that if no candidate achieves a majority in the first round of counting, all but the two candidates with the most votes are eliminated, and the second preferences for those ballots are counted. As in IRV, there is only one round of voting.

Under a variant of contingent voting used in Sri Lanka, and the elections for Mayor of London in the United Kingdom, voters rank a specified maximum number of candidates. In London, the Supplementary Vote allows voters to express first and second preferences only. Sri Lankan voters rank up to three candidates for the President of Sri Lanka.

While similar to "sequential-elimination" IRV, top-two can produce different results. Excluding more than one candidate after the first count might eliminate a candidate who would have won under sequential elimination IRV. Restricting voters to a maximum number of preferences is more likely to exhaust ballots if voters do not anticipate which candidates will finish in the top two. This can encourage voters to vote more tactically, by ranking at least one candidate they think is likely to win.

Conversely, a practical benefit of 'contingent voting' is expediency and confidence in the result with only two rounds. Particularly in elections with few (e.g., fewer than 100) voters, numerous ties can destroy confidence. Heavy use of tie-breaking rules leaves uncomfortable doubts over whether the winner might have changed if a recount had been performed.

Larger runoff process

IRV may also be part of a larger runoff process:

  • Some jurisdictions that hold runoff elections allow absentee (only) voters to submit IRV ballots, because the interval between votes is too short for a second round of absentee voting. IRV ballots enable absentee votes to count in the second (general) election round if their first choice does not make the runoff. Arkansas, South Carolina and Springfield, Illinois adopt this approach.[116] Louisiana uses it only for members of the United States Service or who reside overseas.[117]
  • IRV can quickly eliminate weak candidates in early rounds of an exhaustive ballot runoff, using rules to leave the desired number of candidates for further balloting.
  • IRV allows an arbitrary victory threshold in a single round of voting, e.g., 60%. In such cases a second vote may be held to confirm the winner.[118]
  • IRV elections that require a majority of cast ballots but not that voters rank all candidates may require more than a single IRV ballot due to exhausted ballots.
  • Robert's Rules recommends preferential voting for elections by mail and requiring a majority of cast votes to elect a winner, giving IRV as their example. For in-person elections, they recommend repeated balloting until one candidate receives an absolute majority of all votes cast. Repeated voting allows voters to turn to a candidate as a compromise who polled poorly in the initial election.[5]

The common feature of these IRV variations is that one vote is counted per ballot per round, with rules that eliminate the weakest candidate(s) in successive rounds. Most IRV implementations drop the requirement for a majority of cast ballots.[119]

gollark: They break in weird ways which just leave some features entirely gone or crashing on use.
gollark: See, potatOS updates never break like this.
gollark: Fun fact: China only contains a thousand people but they just multiply all the public data by 10^6.
gollark: Conspiracy theory: China's population is really just a few million and they multiply the statistics by a thousand.
gollark: Do you wonder? I'd assume you've seen the code.

See also

References
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  119. Vermont S.22 1(c)3 Sec. 7. (6) ... if neither of the last two remaining candidates in an election ... received a majority, the report and the tabulations performed by the instant runoff count committee shall be forwarded to the Washington superior court, which shall issue a certificate of election to whichever of the two remaining candidates received the greatest number of votes at the conclusion of the instant runoff tabulation, and send a certified copy of the tabulation and results to the secretary of state.

Practice

Demonstrations and simulations

Advocacy groups and positions

Opposition groups and positions
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