Elections and electoral systems - Electoral systems - Proportional electoral systems

9 important questions on Elections and electoral systems - Electoral systems - Proportional electoral systems

Proportional, or proportional representation (PR), electoral system is:

A quota- or divisor based electoral system employed in multimember district. The two main types are list proportional representation (list PR) and the single transferable vote (STV).

The two main strengths of PR systems are:

  • They tend to produce a more accurate translation of votes into seats
  • small parties are able to win representation in proportion to their size

Four criticisms of PR systems are:

  • They tend to produce coalition government (so who is then responsible)
  • They allow small, extremist parties to win representation
  • Small parties have a strong role in the government formation process and receive concessions that are disproportionate to their actual level of support in the electorate
  • They create a weak link between constituents and their representatives, because no single representative is responsible for policy in a given district
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All proportional electoral systems employ either quotas or divisors, these are:

  • Quota: the 'price' in terms of votes that a party must pay to guarantee themselves a seat in a particular district
  • Divisor (or highest average system): divides the total number of votes won by each party in a district by a series of numbers (divisors) to obtain quotients. District seats are then allocated according to which parties have the highest quotients.

List PR systems differ with respect to:

  • The electoral formula used to allocate seats to parties
  • the district magnitude
  • the use of electoral thresholds
  • the type of party list

The most important factor influencing the proportionality of an electoral system is the district magnitude:

Refers to the number of representatives that are elected in a district. The electoral outcome is likely to be disproportional whoever the district the magnitude is small, irrespective of the particular formula used to translate votes into seats. As district magnitude increases and with it the geographical size of the district, the linkage between representatives and their voters is likely to weaken.

All proportional systems have an electoral threshold, which is the minimum level of support a party needs to obtain legislative representation. It can exist in two ways:

  • A natural threshold: a mathematical by-product of the electoral system, such as the district magnitude. It is not written into electoral laws.
  • A formal threshold: is explicitly written into the electoral law. They are often introduced in an attempt to reduce party system fragmentation by preventing very small parties from gaining representation.

The single transferable vote (STV) is:

A candidate-centered preferential voting system used in multimember districts. Candidates that surpass a specified quota of first-preference votes are immediately elected. In successive counts, votes from elected candidates are reallocated to the remaining candidates until all the seats are filled. It is essentially the same as the alternative vote but applied in multimember districts.

A few strengths of STV systems are:

  • STV systems provide voters with an opportunity to convey a lot of information about their preferences. STV systems allow individuals to vote for candidates from different parties.
  • They create incentives for candidates to appeal to groups outs their core set of supporters and campaign on broad-based centrist platforms.
  • They tend to create a strong link between representatives and their constituents.
  • They reduce the incentive for voters to behave strategically because their votes are less likely to be wasted.

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