Single-member district: Difference between revisions
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{{Wikipedia}} |
{{Wikipedia}} |
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A '''single-member district''' or '''single-member constituency''' is an [[electoral district]] that returns one officeholder to a body with multiple members such as a [[legislature]]. This is also sometimes called '''single-winner voting''' or '''winner takes all'''. The alternatives are [[multi-member district]]s, or the election of a body by the whole electorate voting as one constituency. |
A '''single-member district''' or '''single-member constituency''' is an [[w:electoral district|electoral district]] that returns one officeholder to a body with multiple members such as a [[w:legislature|legislature]]. This is also sometimes called '''single-winner voting''' or '''winner takes all'''. The alternatives are [[w:multi-member district|multi-member district]]s, or the election of a body by the whole electorate voting as one constituency. |
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Many single member systems can be run independently in districts to form a [[Regional System]]. The systems: |
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* [[Approval voting]]: A valid vote can only give a yes or nothing to a given candidate. |
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They can be classified by ballot type: |
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* [[ |
* [[Cardinal voting]]: voting A valid vote allows independent numerical values to be associated with each candidate. (The set of valid values is limited.) |
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* [[Cardinal Voting]]: voting A valid vote allows independent numerical values to be associated with each candidate. (The set of valid values is limited.) |
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=Classification= |
=Classification= |
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They can be sub-classified by different ways to aggregate the ballots. |
They can be sub-classified by different ways to aggregate the ballots. |
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==[[Plurality |
==[[Plurality voting]]== |
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There is only one way to combine plurality votes. |
There is only one way to combine plurality votes. |
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==[[Approval |
==[[Approval voting]] and [[Cardinal voting]]== |
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Since Approval is the degenerate case of Cardinal Ballots they have the same A sum would give the [[Utilitarian_winner]] while a median would give the majoritarian winner. |
Since Approval is the degenerate case of Cardinal Ballots they have the same A sum would give the [[Utilitarian_winner]] while a median would give the majoritarian winner. |
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==[[Ordinal |
==[[Ordinal voting]]== |
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[[Borda count]] and [[Instant-runoff voting]] are common aggregation methods |
[[Borda count]] and [[Instant-runoff voting]] are common aggregation methods |
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==Popular |
==Popular Single Member systems== |
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* [[Plurality Voting]]: A valid vote can choose only one candidate |
* [[Plurality Voting]]: A valid vote can choose only one candidate |