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In page Referendum:

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The usage of participation quorums in referendums is controversial, as higher requirements have been shown to reduced turnout and voter participation.[citation needed] With high participation quorums, the opposition of a referendum has an interest in abstaining from the vote instead of participating, in order to invalidate the referendum results through low turnout. This is a form of the no-show paradox. All others who are not voting for other reasons, including those with no opinion, are effectively also voting against the referendum.