Instead of selecting just one candidate in an election, voters rank candidates in order of preference. This new voting method is gaining attention around the world. Known as RCV (Ranked Choice Voting), or "yuusen junni tsuki touhyou seido" in Japanese, this system has the potential to solve various challenges faced by traditional election systems.In traditional elections, voters can only choose one candidate, which often leads to strategic voting where people vote for someone other than their preferred candidate out of fear of "wasting" their vote. Additionally, when many candidates run, votes can be split, allowing a candidate with minimal support to win. Ranked Choice Voting was developed as a method to more accurately reflect voters' intentions in response to these problems.The system is not particularly complex. Voters rank candidates as their first choice, second choice, third choice, and so on, on their ballot. There is no requirement to rank all candidates—voters can rank as many or as few as they wish. During vote counting, all first-choice votes are tallied first. If a candidate receives a majority, that person wins. If no candidate achieves a majority, the last-place candidate is eliminated, and their voters' second-choice preferences are redistributed to the remaining candidates. This process continues until someone achieves a majority.Let's consider a concrete example. Suppose there is an election with four candidates: A, B, C, and D. In the first round of counting, A receives 35%, B receives 30%, C receives 20%, and D receives 15% of the votes. Since no one has reached a majority, the last-place candidate D is eliminated. Looking at the second choices of those who voted for D, suppose 10% chose A and 5% chose B. After redistributing these votes, A has 45%, B has 35%, and C has 20%. Still no majority, so C is now eliminated. The second choices of C voters (or third choices of those who originally voted for D) are redistributed, and ultimately B reaches 52% and wins. This is how the system ensures that candidates supported by more voters are selected.Benefits of Ranked Choice VotingThe greatest advantage of this system is that voters can vote honestly according to their true preferences. In traditional systems, strategic voting occurred where people thought "I want to vote for this candidate, but since they're unlikely to win, I'll vote for someone else instead." With ranked choice voting, voters can cast their first choice for their preferred candidate and make more practical choices for their second and subsequent preferences. This allows voters' true intentions to be more accurately reflected.Another noted effect is the reduction of negative campaigning. Candidates need not only first-choice votes but also to be selected as second or third choice by supporters of other candidates. Therefore, if they viciously attack other candidates, they risk not being chosen as a second or third preference by those candidates' supporters. As a result, candidates tend to conduct more policy-focused, positive campaigns, and the overall atmosphere of elections becomes more constructive.Furthermore, minority opinions are more easily reflected. In traditional systems, candidates with few supporters had virtually no chance of winning from the start. However, with ranked choice voting, even if a candidate is a minority choice for first preferences, they can influence the final outcome by being selected as many people's second or third choice. This is important from the perspective of respecting diverse opinions in democracy.Eliminating the need for runoff elections on separate dates is also a significant advantage. In traditional systems, to secure a majority, if no candidate reached a majority in the first round, a runoff election between the top two candidates was necessary. This required additional time and expense, and voter turnout tended to decline. Ranked choice voting allows a simulated runoff election to occur in a single vote, saving both time and money.Challenges and CriticismsOn the other hand, this system has several disadvantages and challenges. First, it is more complex for voters than traditional methods. The task of ranking candidates rather than selecting just one may be a high hurdle, especially for elderly people or those with little interest in politics. Voting without fully understanding the method could increase the number of invalid ballots. Therefore, sufficient public education and outreach activities are necessary before implementing the system.The vote counting process is also complex and time-consuming. Manual tabulation is extremely difficult, making the introduction of electronic counting systems essential. The development and implementation of such systems require considerable expense, which can be a significant burden, especially for municipalities with smaller budgets. Ensuring the reliability and security of electronic systems is also an important issue. The time required to produce results may also be met with resistance in Japan, where same-day vote counting is the norm.There is also the criticism that it doesn't necessarily elect the "most popular candidate." Mathematically, it's possible for a candidate who had the most first-choice votes to lose as a result of preference redistribution. This is a problem known as the "Condorcet paradox," where the will of the majority may not necessarily be reflected. However, such cases are rare in practice, and the general view is that candidates acceptable to more people tend to be elected.There are also concerns about whether the system advantages or disadvantages specific political positions. Generally, it is said that centrist candidates tend to be favored because they are more likely to be selected as second or third choices. Conversely, candidates with clear positions may be strong in first-choice votes but less likely to be selected as second or subsequent choices by supporters of other candidates. However, this is not necessarily unfair and can be seen as a characteristic of a system that selects candidates acceptable to more voters.Implementing in JapanIf ranked choice voting were to be introduced in Japan, several stages could be considered. The most realistic approach would be to first implement it on a trial basis in local government mayoral or assembly elections. Since nationwide implementation would face high hurdles in terms of institutional design and legal amendments, an approach where motivated municipalities take the lead and verify the effects would be appropriate.In terms of costs, the main expenses would be the introduction of electronic counting systems, changes to ballots, and public education activities. For a medium-sized municipality (with a population of around 200,000), initial investment is estimated to range from tens of millions to 100 million yen. This includes costs for developing or purchasing counting systems, upgrading voting equipment, staff training, and public outreach to residents. Ongoing maintenance costs are estimated at several million yen annually, though eliminating runoff elections could lead to long-term cost savings.The administrative burden on municipalities would also increase. Election management committees would need to master the new system, and vote counting procedures would change significantly. More careful explanations would be needed for poll watchers and counting observers on election day. Additionally, increased inquiries from voters are expected, potentially requiring the establishment of call centers or increases in staff. Confusion is anticipated especially in the early implementation period, requiring adequate preparation time and staffing.Compatibility with Japan's election system is also a point to consider. The current Public Offices Election Law is fundamentally based on single-vote systems, so legal amendments would be necessary to introduce ranked choice voting. Whether local governments can independently introduce it through ordinances also requires legal examination. Japan also has various regulations and rules to ensure electoral fairness, and their compatibility with ranked choice voting must be considered.Global ImplementationRanked choice voting has already been adopted in many countries and cities around the world. The most widespread implementation is in Australia, which has used it in federal House of Representatives elections since 1918, with over 100 years of history. In Australia, it's called "preferential voting" rather than "ranked choice voting," and voters are required to rank all candidates. With long operational experience, voters have become familiar with the system.In Ireland, a similar system called "Single Transferable Vote" is used in presidential and local elections. This was introduced in the 1920s and also has a long history. The Republic of Malta also uses a similar system in national elections, and it operates relatively smoothly in smaller countries.Recent years have seen rapid implementation in the United States. Maine has used ranked choice voting in statewide elections since 2018. Alaska also introduced it in 2022 following a 2020 referendum. New York City adopted it for mayoral elections starting in 2021, attracting attention as a full-scale implementation example in a major city. Other cities including San Francisco, Minneapolis, and Cambridge have introduced it in local elections. The spread in America is driven by dissatisfaction with the traditional two-party system and voters' desire to reflect more diverse voices in politics.In New Zealand, it has been introduced in some local elections, and in the United Kingdom, it is used in mayoral elections. Scottish and London mayoral elections also adopted a type of ranked choice voting called "supplementary vote" (London changed systems in 2024). In Canada, some cities have considered it, but federal-level implementation promised in the 2015 election campaign was not realized.Several lessons can be learned from experiences in these countries and cities. First, while there is initial confusion, voters become accustomed after several elections. Invalid ballot rates tend to be slightly higher initially but decrease with successive elections. And while negative campaigning may not decrease as much as expected in some cases, overall evaluations suggest that election quality has improved.When considering implementation in Japan, it is important to thoroughly study these international cases and adapt them to fit Japan's political culture and electoral system. In particular, experiences in American cities would be valuable references for considering implementation in Japan's major cities. Additionally, the long-term operational track records of Australia and Ireland can provide lessons about the stability and sustainability of the system.Ranked choice voting is a mechanism with the potential to improve democracy. It more accurately reflects voters' true intentions, promotes constructive campaigning, and respects diverse opinions. While these advantages are attractive, implementation also requires considerable cost and effort. Whether to introduce it in Japan should be determined through careful comparison of these merits and demerits and extensive national debate. A realistic first step might be for interested municipalities to implement it on a trial basis in small-scale elections and verify the results. Electoral systems are the foundation of democracy, and their reform should be approached cautiously, but continuing to seek better systems is also necessary to protect and develop democracy.ReferencesAustralian Electoral Commission official website - Explanation of ranked choice voting system and operational resultsFairVote - Survey reports and implementation case database on ranked choice voting promotion in the United StatesMaine Secretary of State's Office - Official records and election results regarding ranked choice voting implementation since 2018New York City Board of Elections - Implementation report on ranked choice voting in the 2021 mayoral electionAlaska Division of Elections - Operational report on ranked choice voting system in 2022 electionsIrish Electoral Commission - History and implementation status of Single Transferable Vote systemRanked Choice Voting Resource Center - Summary of implementation status and academic research worldwideMIT Election Data and Science Lab - Research papers on the effectiveness of ranked choice votingStanford Center on Democracy, Development and the Rule of Law - Comparative research on electoral system reformLocal Government New Zealand - Case reports on ranked choice voting in local elections