A referendum on the electoral law was held in Italy on 18 April 1999.[1] Voters were asked whether they approved of replacing the mixed-member proportional representation electoral system (in which 75% of seats in Parliament were elected in single-member constituencies and 25% by compensatory proportional representation) with one based solely on single-member constituencies, with the 25% of seats instead allocated to the second-placed in the constituencies with the most votes.[2] The proposal was supported by larger parties, but opposed by smaller ones.[2] Although the proposal was approved by 91.5% of voters, turnout was only 49.6%, resulting in the referendum being invalidated as the threshold of 50% was not passed.[3]
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