Plurality block voting
Plurality block voting, also known as the block vote or multiple non-transferable vote, is a majoritarian electoral system employed in multi-member districts where each voter can cast a ballot for up to as many candidates as there are seats available, and the candidates with the highest vote totals are declared winners without requiring a majority.[1] This method extends the principles of single-member plurality voting to scenarios with multiple representatives per constituency, allowing voters to express preferences for individual candidates rather than party lists.[2] In practice, political parties often nominate a slate of candidates equal to the number of seats, encouraging supporters to allocate all their votes to that group, which can amplify the representation of dominant parties while marginalizing smaller ones.[3] The system promotes stable majorities and accountability to larger voter blocs but frequently results in disproportionate outcomes, where a party securing a bare plurality of votes may capture all seats in the district, reducing incentives for coalition-building or minority inclusion.[3][4] Historically prevalent in various national and subnational elections, plurality block voting persists in select contexts, such as certain cantonal assemblies in Switzerland and some local or specialized votes elsewhere, though it has largely been supplanted by proportional systems in favor of broader representation.[5] Its defining characteristic lies in simplicity and linkage to geographic districts of manageable size, yet empirical analyses highlight its tendency to exacerbate political polarization by rewarding coordinated bloc voting over diverse electoral competition.[6][3]Definition and Mechanics
Ballot Casting and Voter Choice
In plurality block voting, also known as the block vote, voters in multi-member electoral districts cast ballots by selecting up to as many candidates as there are seats to be filled, typically marking one vote per chosen candidate without transferring votes to others.[1] This process allows each voter a total of S votes, where S represents the number of available seats, but prohibits allocating multiple votes to a single candidate, ensuring votes remain non-cumulative and non-transferable.[7] Ballots are usually presented as lists of individual candidates rather than party slates, though parties often nominate multiple candidates per district to align with the system's structure.[2] Voters exercise choice by distributing their votes across preferred candidates, often prioritizing those from a dominant party or aligned group to maximize representation for that faction, as fragmented voting risks diluting support and ceding seats to competitors.[8] This strategic incentive encourages bloc-style voting, where supporters of the largest group concentrate votes on a slate of co-partisans, potentially leading to all seats being won by candidates from a single party even if it lacks an absolute majority of the electorate.[1] Empirical observations from systems employing block voting indicate that voter turnout and participation patterns reflect this dynamic, with minority voters sometimes abstaining from full vote usage to avoid aiding rivals inadvertently.[2] The ballot design facilitates straightforward marking, such as crosses or checks beside candidate names, but lacks mechanisms for ranking or expressing secondary preferences, limiting voter expression to affirmative selections only.[7] This simplicity promotes high comprehension among voters but can constrain nuanced choice in diverse electorates, as voters cannot hedge against underperforming favorites without wasting votes.[8] In practice, electoral authorities enforce limits to prevent over-voting, invalidating ballots that exceed S selections or violate single-vote-per-candidate rules.[1]Vote Counting and Seat Allocation
In plurality block voting, votes are counted by tallying the total number received by each candidate from all ballots cast.[5] Each voter may allocate up to as many votes as there are seats to be filled (denoted as S), either distributing them across distinct candidates (vote splitting) or concentrating multiple votes on fewer candidates (vote plumping), but votes are non-transferable and cannot exceed one per candidate unless plumping is explicitly disallowed by rules.[2] The candidates are then ranked by their vote totals in descending order, and the top S candidates are allocated the seats, regardless of whether any achieve an absolute majority.[9] This process favors candidates with broad but not necessarily deep support, as the system lacks quotas or runoff mechanisms to ensure majority backing.[8] Seat allocation occurs without proportionality adjustments or minority protections, resulting in winner-take-all outcomes within the multi-member district.[5] For instance, if a cohesive voting bloc supports candidates from a single party or faction with all available votes, that group can secure every seat even if it holds only a bare plurality of overall voter support, as fragmented opposition votes dilute across multiple candidates.[2] Ties are resolved by local electoral laws, often through lotteries or recounts, though such cases are rare given the scale of typical vote margins.[5] This counting method, rooted in simple aggregation, prioritizes computational ease over representational equity, as evidenced by its historical use in systems like early 20th-century U.S. city councils where dominant parties monopolized multi-seat boards.[8]Illustrative Examples
In a district electing three representatives, suppose 100 voters participate, each permitted to cast up to three votes for individual candidates from a field including six contenders: three aligned with Majority Party (M1, M2, M3) and three with Minority Party (N1, N2, N3). If 55 voters each allocate their three votes to M1, M2, and M3—yielding 55 votes apiece for those candidates—while the remaining 45 voters distribute their votes across N1, N2, and N3 (e.g., 45 for N1, 30 for N2, 20 for N3), the winners are determined by total votes: M1 (55), M2 (55), M3 (55), with N1 (45) fourth. Thus, Majority Party secures all seats, even though it holds only 55% support.[8][5]| Candidate | Votes Received | Outcome |
|---|---|---|
| M1 | 55 | Elected |
| M2 | 55 | Elected |
| M3 | 55 | Elected |
| N1 | 45 | Not elected |
| N2 | 30 | Not elected |
| N3 | 20 | Not elected |