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In page Proportional representation:

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With PR, there are no swing seats. Most votes contribute to the election of a candidate, so parties need to campaign in all districts, not just those where their support is strongest or where they perceive most advantage. This fact in turn encourages parties to be more responsive to voters, producing a more "balanced" ticket by nominating more women and minority candidates.[3] On average about 8 percent more women are elected in PR systems than non-PR systems.[citation needed]