Alternative Vote

Alternative Vote
Name	Alternative Vote
Other names	Instant-runoff voting, Ranked-choice voting
Type	Single-winner preferential voting
First use	19th century proposals
Region	Worldwide

Alternative Vote

The Alternative Vote is a single-winner preferential electoral method in which voters rank candidates and counting proceeds by elimination and transfer until a candidate obtains a majority. It is used in diverse jurisdictions and has been the subject of debates involving electoral reform, party strategy, and legal challenges. Proponents point to majority support and reduced vote-splitting, while critics cite monotonicity, tactical vulnerabilities, and complexity in some contexts.

Overview

The method requires voters to express an ordinal preference among candidates on a paper or electronic ballot, and uses iterative elimination to ensure the winner has a majority of continuing votes. It contrasts with plurality systems like First Past the Post and with proportional systems such as Single Transferable Vote and Mixed-Member Proportional Representation, and is often proposed by reform advocates including groups associated with Electoral Reform Society, FairVote, and academic reformers at institutions like Harvard University and University of Oxford. Legal and political discourse around the method has involved courts such as the High Court of Australia, the Supreme Court of Canada, and constitutional scholars at Yale Law School.

History and Development

Origins trace to 19th-century writers and reformers, with formal descriptions by figures connected to Thomas Hare and proposals debated in parliaments such as the Parliament of the United Kingdom and assemblies in New South Wales. The system influenced electoral experiments in territories administered by the British Empire, and reform campaigns in the 20th and 21st centuries involved organizations like the Labour Party, the Liberal Democrats, and Green Party movements. Key legal milestones and referendums occurred in places including Australia (state and federal usages), Ireland (referenda and constitutional debates), and campaign episodes in United States cities where groups such as Bay Area Rapid Transit ballots intersected with municipal reform efforts.

Voting Procedure and Ballot Mechanics

Ballots are structured to collect ranked preferences, often formatted with candidate names and ordinal fields similar to practices in elections run by bodies like the Electoral Commission (United Kingdom) and the Australian Electoral Commission. Counting follows sequential rounds: if no candidate achieves a majority of first-preference votes, the candidate with the fewest continuing votes is eliminated and their ballots are redistributed according to next preferences, a process used in counting centers such as those operated by the State Electoral Office in Australian states and municipal election offices in San Francisco and Minneapolis. Variants include optional preferential ballots, full preferential ballots, and exhausted-ballot handling procedures debated in regulatory hearings before agencies like the Federal Election Commission and electoral tribunals in jurisdictions like Ontario.

Use Worldwide (Adoption and Abolition)

The method has been adopted, retained, modified, or repealed in numerous polities, including long-standing use in national lower houses in parts of Australia and in presidential primaries within the United States Democratic Party, adoption in municipal contests in cities such as San Francisco and Minneapolis, and abolition episodes in territories administered by former colonial authorities. Notable adoption votes and repeal referendums have occurred in jurisdictions involving actors like the New Zealand National Party, the Scottish National Party, and local governments in Maryland and Maine, while international organizations including the Commonwealth Secretariat have produced guidance on implementation and legal frameworks.

Advantages and Criticisms

Advocates cite majority outcomes, mitigation of spoiler effects observed in contests like 2000 United States presidential election, encouragement of broader campaigning like that seen in some Australian electorates, and potential reductions in negative campaigning noted by comparative political scientists at Stanford University and Princeton University. Critics point to non-monotonicity demonstrated in theoretical work by researchers at Cornell University and University of Cambridge, vulnerability to tactical ranking strategies highlighted in analyses relating to the Condorcet paradox, administrative cost and complexity issues raised in cases before electoral commissions such as those in England and Wales, and legal challenges brought in courts including the High Court of Australia and provincial tribunals in Canada.

Comparative Systems and Variants

Variants and related systems include the Single Transferable Vote for multi-member districts, the Condorcet method family, top-two runoff systems like those used in California and Washington (state), two-round systems found in national contests such as the French presidential election, and deferred-choice methods proposed by theorists at Columbia University. Hybrid arrangements combine ranked ballots with proportional elements in systems modeled by the Mixed-Member Proportional Representation framework, while optional preferential and full-preferential implementations produce divergent ballot exhaustion and transfer patterns analyzed in comparative studies at institutions like The London School of Economics.

Notable Elections and Case Studies

Illustrative cases include Australian federal and state elections where preferences determined outcomes for legislators representing electorates like Warringah and Melbourne, mayoral contests in San Francisco and Minneapolis where ranked-choice counts affected final winners, party leadership ballots such as those within the Labour Party (UK) and Liberal Democrats (UK), and municipal referendums in Maine and Missouri that produced legal and political follow-up. Academic case studies have examined tactical dynamics in contests involving parties like the Australian Labor Party, the Liberal Party of Australia, and third-party actors such as the Green Party (Australia), with modeling by scholars from Massachusetts Institute of Technology and empirical assessments published in journals associated with Cambridge University Press.

Category:Electoral systems