Parallel voting
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Parallel voting describes a mixed voting system where voters in effect participate in two separate elections using different systems, and where the results in one election have little or no impact on the results of the other. If one of the two election counts does have a substantial impact on the result of the other, then mixed member proportional voting may be a better description.
The Supplementary Member system (SM) is a parallel voting system that combines plurality voting (sometimes called "first past the post") with proportional representation.
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[edit] Procedure
Under SM, a proportion of seats in the legislature are filled by pluralities in single member constituencies. The remainder are filled from party lists, with parties often needing to have polled a certain amount, often 5 % of the vote, in order to achieve representation, as is common in many proportional systems.
Unlike Mixed Member Proportional, where party lists are used to achieve an overall proportional result in the legislature, under SM, proportionality is confined only to the list seats. Therefore, a party that secured say 5% of the vote will have only 5% of the list seats, and not 5% of all the seats in the legislature.
The proportion of constituency seats compared to list seats is often, but need not be, 50:50.
[edit] Advantages and Disadvantages
SM allows smaller parties that cannot win individual elections to secure some representation in the legislature; however, unlike in a proportional system they will have a substantially smaller delegation than their share of the total vote.
A criticism of proportional voting systems is that the largest parties need to rely on the support of smaller ones in order to form a government. However, smaller parties are still disadvantaged as the larger parties still predominate. In countries where there is one dominant party and a divided opposition, the proportional seats may be essential for allowing an effective opposition.
Since plurality voting in single member constituencies is likely to lead to clear majorities, and thus "strong government", the extra seats that the big parties are likely to win as well are unnecessary for strong government. The opposition, which may only win seats in the SM part of the election, may be too weak to ensure that the government is accountable, leading to less than good government.
[edit] Countries where used
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[edit] Formerly
[edit] See also
- This entry is related to, but not included in the elections and voting series. Other related articles can be found at the Politics Portal.
- Voting system
