Diverse voters casting ballots featuring glowing approval symbols and rankings, representing a modern, simplified voting system.

Beyond Ranking: How Approval Voting Could Revolutionize Elections

"A new approach to instant runoff voting promises to simplify the process and better reflect voter preferences."


Instant Runoff Voting (IRV) is used in many elections worldwide, offering voters the chance to rank candidates by preference. But what if there were a simpler, more expressive way to cast your ballot? A recent study introduces a fascinating twist on IRV, called Approval-IRV, which aims to make voting easier and more reflective of what voters truly want.

The hurdle with standard IRV is that it requires voters to rank all candidates, which can be overwhelming, especially in elections with many options. Imagine having to rank dozens of candidates when you only strongly support a few! This complexity not only discourages participation but can also lead to unintentional errors on ballots.

Approval-IRV addresses these issues head-on by allowing voters to express indifference between candidates. Instead of forcing a strict ranking, you can indicate equal preference for multiple candidates. This simple change promises to reduce the cognitive load on voters, increase ballot validity, and potentially shift election outcomes to better align with the majority's wishes.

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The State of Electoral Reform

Electoral systems around the world predominantly rely on variations of plurality or majority voting, yet growing dissatisfaction with outcomes such as vote-splitting and the spoiler effect has fueled interest in alternatives. Approval voting — in which voters select all candidates they find acceptable — has emerged as one such proposal, though it remains little used in major governmental elections. Proponents suggest it could reduce polarization and encourage broader coalitions, though comprehensive empirical data on large-scale adoption remain limited. The conversation around reforming how citizens choose their representatives is gaining traction in both academic and civic circles.

Conventional Methods and Their Shortcomings

Most democracies use either single-member plurality (first-past-the-post) or some form of runoff system, both of which require voters to express a single top choice. These methods are well understood administratively but are known to produce outcomes where a candidate can win with less than majority support, or where viable alternatives are eliminated prematurely. Strategic voting — where citizens cast ballots not for their true preference but to block a less-desired outcome — is a widely recognized drawback of these systems. These limitations have motivated researchers and reformers to explore methods that capture a broader range of voter preferences.

The Concept of Approval: A Foundation

The word 'approval' carries a consistent core meaning across major English-language reference works. Merriam-Webster defines it as 'an act or instance of approving something' or 'approbation,' framing it as an active expression of positive judgment. The Cambridge Dictionary similarly describes it as 'the feeling of having a positive opinion of someone or something,' emphasizing both an evaluative and emotional dimension. Vocabulary.com adds that approval constitutes 'a formal agreement,' underscoring its role in legitimizing decisions. This shared conceptual foundation — that approval signifies a positive, formal endorsement — underpins the logic of approval voting as a electoral method.

What is Approval-IRV and How Does It Work?

Diverse voters casting ballots featuring glowing approval symbols and rankings, representing a modern, simplified voting system.

Approval-IRV combines aspects of traditional IRV with approval voting. In each round, voters effectively 'approve' of their most-preferred candidates who haven't yet been eliminated. The candidate with the fewest approvals is then removed, and the process repeats until a single winner emerges.

This approach contrasts with other methods, such as Split-IRV, where votes are divided equally among top choices. Approval-IRV maintains key characteristics of IRV, such as independence of clones and respect for cohesive majorities. Clones being other candidates that are ranked adjacently by all voters. Prioritizing community respect for a certain issue or person over all else.

  • Less Effort: Voters can give equal preference to multiple candidates.
  • More Expressive: Voters can indicate indifference.
  • Fewer Invalid Ballots: Reduces errors.
  • Better Incentives: Supports one's favorite.
  • Compromise: Compromises between Ranked Choice Voting and Approval Voting.
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Approval in Electoral Context

The Free Dictionary defines approval as 'the act or an instance of approving,' 'an official approbation; a sanction,' and 'favorable regard; commendation.' Notably, it includes the idiom 'on approval,' which refers to something given for examination before a commitment is made — a concept that resonates with the idea of voters evaluating multiple candidates simultaneously. In the context of approval voting, these layered meanings suggest a system in which voters formally endorse all candidates they consider worthy of office, rather than being limited to a single selection. This multi-endorsement model has been the subject of academic analysis exploring its effects on representation and voter satisfaction.

Potential Challenges and Criticisms

Approval voting is not without its critics, who raise concerns about voter confusion, the risk of bullet voting (where voters select only one candidate out of habit), and the difficulty of shifting public expectations around how to express preferences. Some argue that without ranked information, approval voting may not fully capture the intensity of voter preferences, potentially overlooking nuances that ranked-choice systems can convey. Others point to the challenge of building the political will necessary to overhaul established electoral infrastructure. While these objections are debated in academic literature, robust real-world failure data specific to approval voting remains sparse.

Weighing Electoral Alternatives

Different voting systems involve inherent trade-offs between simplicity, voter expressiveness, and the likelihood of electing broadly acceptable candidates. Approval voting is often compared to plurality voting for its simplicity and to ranked-choice methods for its greater expressiveness. Whether it outperforms alternatives on metrics such as voter satisfaction, representativeness, or resistance to strategic manipulation remains an active area of inquiry. Without consensus benchmarks or large-scale comparative trials, definitive rankings of one system over another are difficult to establish.

The researchers, Théo Delemazure and Dominik Peters, demonstrate that Approval-IRV uniquely extends IRV to accommodate weak orders while preserving its core axiomatic properties. These properties include independence of clones (ensuring similar candidates don't unduly influence the outcome) and respecting cohesive majorities (giving weight to the preferences of large, unified groups of voters).

The Future of Voting is Simpler, More Expressive

The rise of Approval-IRV signals a shift toward more user-friendly and representative election systems. By allowing voters to express genuine preferences without the burden of strict rankings, this method addresses key shortcomings of traditional IRV. Further research and implementation could pave the way for elections that are not only easier to participate in but also more accurately reflect the collective will of the electorate.

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Bringing the Threads Together

Approval voting represents a conceptually elegant idea — letting voters say yes to every candidate they find acceptable — that draws on a straightforward and widely understood notion of approval. Whether it can deliver on its promise in practice depends on a range of factors, from ballot design and voter education to the political culture in which it is introduced. Scholars and practitioners continue to study its effects, but definitive conclusions await broader adoption and more rigorous empirical testing. The conversation around approval voting ultimately reflects deeper questions about what democracies owe their citizens in terms of meaningful choice.

What Lies Ahead for Electoral Innovation

As dissatisfaction with traditional voting methods persists, approval voting may see renewed interest among reformers seeking simpler alternatives to ranked-choice systems. Pilot programs, municipal experiments, and academic simulations could provide much-needed evidence on its real-world performance. The growing availability of data on voter behavior and preferences may also enable more sophisticated modeling of approval voting outcomes. Whether it gains mainstream traction will depend on public receptivity, political feasibility, and the quality of evidence supporting its claimed benefits.

Systemic Hurdles to Reform

Any change to an electoral system operates within a broader ecosystem of legal frameworks, institutional inertia, and entrenched political interests. Approval voting, like other reform proposals, faces the challenge of displacing methods that — despite their known flaws — are deeply familiar to voters, administrators, and candidates alike. Legal and constitutional constraints may further limit where and how such changes can be implemented. These systemic realities mean that even well-supported reforms can take decades to move from theory to practice.

How Voters Experience Approval Voting

Ultimately, the success of any voting system rests on how well it serves the people using it — their understanding, trust, and sense that their voice has been genuinely heard. Approval voting offers the intuitive appeal of letting voters express broad support, but its real-world impact on civic engagement and satisfaction remains largely unmeasured at scale. Early theoretical models suggest it could reduce the anxiety of strategic voting and encourage more positive campaign dynamics, though these effects are difficult to predict with certainty. The human dimension of electoral reform — how real people interact with and feel about the systems they use — will be a critical factor in determining approval voting's future.

About this Article -

Written with AI assistance from published research, and reviewed by the Mystum team. See our About page for more information.

This article is based on research published under:

DOI-LINK: https://doi.org/10.48550/arXiv.2404.11407,

Title: Generalizing Instant Runoff Voting To Allow Indifferences

Subject: cs.gt econ.th

Authors: Théo Delemazure, Dominik Peters

Published: 17-04-2024

Everything You Need To Know

1

What is Approval-IRV and how does it improve upon Instant Runoff Voting (IRV)?

Approval-IRV is a voting method that combines elements of traditional Instant Runoff Voting (IRV) and approval voting. Unlike IRV, which requires voters to rank all candidates, Approval-IRV allows voters to express equal preference for multiple candidates. This reduces the cognitive load on voters, making the voting process simpler and less prone to errors. In each round of Approval-IRV, voters 'approve' of their most-preferred candidates who haven't yet been eliminated, and the candidate with the fewest approvals is removed until a winner emerges. The key benefit is that Approval-IRV aims to make voting easier and more reflective of what voters truly want by allowing them to indicate indifference between candidates.

2

How does Approval-IRV handle scenarios with many candidates, and what are the benefits of this approach?

In elections with numerous candidates, Approval-IRV offers significant advantages over traditional ranking methods. It addresses the complexity of ranking many candidates, which can overwhelm voters and lead to errors. By allowing voters to approve of multiple candidates without strict ranking, Approval-IRV simplifies the process. This approach can increase voter participation and reduce invalid ballots. Voters can express their preferences without being forced to choose between candidates they are indifferent about, leading to a more accurate reflection of voter preferences. The advantages include less effort for voters, more expressive ballots, and better incentives to support one's favorite candidates without the need for complex rankings.

3

What are the core characteristics of Instant Runoff Voting (IRV) that Approval-IRV maintains, and why are these important?

Approval-IRV maintains key characteristics of Instant Runoff Voting (IRV), such as independence of clones and respect for cohesive majorities. Independence of clones means that the presence of similar candidates (clones) on the ballot should not unduly influence the election outcome. Respect for cohesive majorities ensures that the preferences of large, unified groups of voters are given due weight. These properties are crucial for ensuring fairness and representativeness in elections. By preserving these characteristics, Approval-IRV provides a more reliable and trustworthy way to reflect the will of the electorate, preventing manipulation and ensuring that the outcome reflects the collective will.

4

Who are Théo Delemazure and Dominik Peters, and what is their contribution to the development of Approval-IRV?

Théo Delemazure and Dominik Peters are researchers who have contributed to the development and understanding of Approval-IRV. Their work demonstrates that Approval-IRV uniquely extends Instant Runoff Voting (IRV) to accommodate weak orders while preserving its core axiomatic properties. Their research provides the framework for the potential of Approval-IRV as a simpler, more expressive, and potentially fairer voting method. By analyzing its axiomatic properties, they offer a robust theoretical foundation for the method, validating its principles and showcasing its potential for wider adoption.

5

How does Approval-IRV compare to other voting methods like Split-IRV and Ranked Choice Voting, and what are its unique features?

Approval-IRV distinguishes itself from methods like Split-IRV, where votes are divided equally among top choices. Approval-IRV allows voters to 'approve' of their preferred candidates in each round, with the candidate receiving the fewest approvals being eliminated until a winner is determined. Approval-IRV also serves as a compromise between Ranked Choice Voting and Approval Voting. Its unique features include allowing voters to express indifference, reducing cognitive load, and potentially leading to outcomes that better align with the majority's wishes. The method provides a more user-friendly and representative election system by enabling voters to express their genuine preferences without the burden of strict rankings, marking an important step toward simpler, more expressive voting systems.

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