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Example: The SNP's coalition with the Green Party in 2007 shows how smaller parties can become influential despite having minimal seat counts.
Example: Conservative majority in 2015, despite only 37% of the vote.
Example: SNP's minority government post-2016 election.
Example: Northern Ireland Assembly's power-sharing arrangements.
Feature | First Past the Post (FPTP) | Additional Member System (AMS) | Single Transferable Vote (STV) |
---|---|---|---|
Type of System | Plurality/Majoritarian | Mixed (Combination of FPTP and Proportional) | Proportional |
How Votes Are Cast | One vote per voter for a single candidate | Two votes: one for a constituency representative and one for a party list | Ranked choice (voters rank candidates in order of preference) |
How Seats Are Allocated | Candidate with the most votes in a constituency wins | Constituency seats filled by FPTP; additional seats filled proportionally from party lists | Seats are distributed according to voters' ranked preferences and quotas |
Used In | UK General Elections | Scottish Parliament, Welsh Senedd, London Assembly | Northern Ireland Assembly, Scottish local elections, Republic of Ireland |
Proportionality | Low (Disproportionality is common) | Medium (Mix of proportional and majoritarian) | High (More proportional to the votes cast) |
Representation of Smaller Parties | Poor (Smaller parties struggle to win seats) | Better (Smaller parties gain representation through the list system) | Strong (Smaller parties and independents often win seats) |
Link Between MPs and Constituents | Strong (One MP per constituency) | Mixed (Constituency MPs with list members who don't represent a specific area) | Weaker (Larger multi-member constituencies) |
Chance of Majority Government | High (Often leads to single-party majority governments) | Lower than FPTP but higher than STV | Low (Coalitions more likely) |
Voter Choice | Limited (Voters choose one candidate) | Moderate (Voters choose a candidate and a party) | High (Voters rank multiple candidates by preference) |
Likelihood of Tactical Voting | High (Voters often vote tactically to avoid splitting the vote) | Moderate | Low (Ranking candidates reduces the need for tactical voting) |
Complexity | Simple | Moderate complexity | More complex (Requires understanding of ranking and transfers) |
Spoiled Ballots | Low (Simple voting process) | Moderate (Due to two votes) | Moderate to High (Ranking system can lead to mistakes) |
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