or sole (
unicameral) house of national legislatures, : In a democracy, the members of the government are elected by a portion of the people who vote in an
election. Elections are a way for an electorate to
elect, that is
choose, from two or more different candidates. Many countries in the world see elections fought principally between two opposing parties, known as a
two-party system. These two will be the most established and most popular parties in the country. For example, in the US, the competition is between the
Republicans and the
Democrats. Many other countries have multi-party systems where different socio-economic classes, ethnic and racial groups, regions and other diversities each have their own party. In an indirect or
representative democracy,
voting and elections are the method by which the people choose the people who will represent them, whilst making decisions. Under
Direct democracy the people vote to show their preferences to make policy decisions directly without selecting a representative to decide for them. A majority vote is when more than half of voters vote for the same person or party. This happens any time only two are in the running for a post but only sometimes when two or more candidates are in the running. Plurality is when the successful candidate or candidates are decided just by relative strength, having more votes than the other candidates, whether in a multiple-winner context or in a single-winner context. Many countries use a combination of factors to decide who has power, not the at-large "popular vote" using either the majority or plurality method. Most influential of these factors are districts that divide the electorate. For example, in any country where first past the post is used in numerous separate districts such as the UK, a party winning plurality in a majority of constituencies wins majority government, but they often do not have a majority of votes, and sometimes not even the most individual votes (i.e. another party may have more votes but the party still takes more seats). (It is possible for a party to win plurality in a minority of constituencies (but more than any other one party) and thus win minority government.) Electoral systems consist of the detailed constitutional arrangements and voting systems that convert the vote into a political decision. The first step is for each voter to cast a
ballot, which may be a simple single-choice ballot or another type such as multiple choice or a
ranked ballot. Then the votes (either taken at-large or in
electoral districts) are tallied, for which various
vote counting systems may be used. The voting system then allocates the seats on the basis of the tally. Most systems allocate seats based on relative strength (
pluralities),
majorities, or
proportional representation, or a
a mixture of these systems. Among the proportional systems, the most commonly used are
party-list proportional representation (list PR). Among majority- or plurality-based systems the common systems include
first-past-the-post electoral system (single winner
plurality voting) and different methods of majority voting (such as the widely used
two-round system).
Mixed systems combine elements of both proportional and majoritarian/plurality systems, with some (
mixed-member proportional) typically producing results closer to the former and others (e.g.
parallel voting) sometimes having just as much dis-proportionality as first past the post. Many countries have
electoral reform movements that advocate for change to other election systems such as proportional representation,
approval voting,
single transferable vote,
instant runoff voting or a
Condorcet method. These alternative systems also are popular for lesser elections in some countries where more important elections still use more traditional counting methods. While openness and
accountability are usually considered cornerstones of a democratic system, the act of casting a vote and the content of a voter's ballot are usually an important exception. The
secret ballot is a relatively modern development, but it is now considered crucial in most
free and fair elections, as it limits the effectiveness of intimidation.
Electoral systems Many electoral methods are used in the world. The purpose of an election may be to choose one person, such as a president, or a group of members, such as a committee or a parliament. In electing a parliament, either each of many small constituencies elects a single representative, as in elections to the United Kingdom parliament; or each of a lesser number of multi-member constituencies elects two or more representatives, as in Ireland; or multi-member districts and some single-member districts can be used; or the entire country can be treated as one "at-large" district, as in The Netherlands., without the need to register, every citizen receives at home the
ballot papers and information brochure for each voting (and can send it by post). Switzerland has a
direct democracy system and votes (and elections) are organized about four times a year; here, to
Berne's citizens in November 2008 about 5 national, 2 cantonal, 4 municipal referendums, and 2 elections (government and parliament of the City of Berne) to take care of at the same time. Different voting systems require different levels of support to be elected.
Plurality voting (
First-past-the-post voting) elects the candidate with more votes than any other single candidate. It does not require the winner to achieve a majority, to have more than half of the total votes cast. In
First-past-the-post voting, when more than two candidates run, the winner commonly has less than half of the vote, as few as 18 percent was recorded in 2014 in Toronto. In
Instant-runoff voting, a candidate must have a majority of votes to be elected, although presence of exhausted votes may mean that the majority at time of final count is not majority of votes cast initially. In STV, any candidate who takes quota (usually set at much less than half of the votes) is elected; others without quota (but with more votes than any other single candidate) may be declared elected as well. Side effects of
First-past-the-post voting include a
waste of votes due to
vote splitting, a
two-party system and
political polarization due to electing candidates that do not support
centrism. To understand why a race using
First-past-the-post voting tends to favor less-centric candidates, consider a simple lab experiment where students in a class vote for their favorite marble. If five marbles are assigned names and are placed "up for election", and if three of them are green, one is red, and one is blue, then a green marble will rarely win the election. The reason for the green's lack of success is vote splitting. The three green marbles will split the votes of those who prefer green. In fact, in this analogy, the only way that a green marble is likely to win is if more than three-fifths of the voters prefer green. If the same number of people prefer green as those who prefer red and blue, that is to say, if one-third of the voters prefer green, one-third prefer blue, and one-third prefer red, then each green marble will only get one-ninth of the vote, if the green marbles each take same number of votes, while the red and blue marbles will each get one-third, putting the green marbles at a serious disadvantage. If the experiment is repeated with other colors, the color that is in the majority (if the majority is split among multiple choices) will still rarely win. In other words, from a purely mathematical perspective, a single-winner system tends to favor a winner that is different from the majority, if the majority runs multiple candidates, and if the minority group runs just one candidate. This minority rule success can also result if multiple winners are elected and voters cast multiple votes (
Plurality block voting). But even if the majority is split among multiple candidates, proportionate results can still be produced if votes can be transferred, as under STV, or if multiple winners are elected and each voter has just one vote. Alternatives to first-past-the-post voting include
approval voting,
two-round,
proportional representation, and
instant-runoff voting. With
approval voting, voters are encouraged to vote for as many candidates as they approve of, so the winner is much more likely to be any one of the five marbles because people who prefer green will be able to vote for every one of the green marbles. With two-round elections, the field of candidates is thinned prior to the second round of voting. In most cases, the winner must receive a
majority of the votes, which is more than half. If no candidate obtains a majority in the first round, then the two candidates with the most significant plurality run again for the second round of voting. Variants exist regarding these two points: the requirement for being elected at the first round is sometimes less than 50%, and the rules for participation in the runoff may vary.
block voting are often used for
at-large positions such as members of a city council. In a voting system that uses
multiple votes (
Plurality block voting), the voter can vote for a multiple-member subset of the running candidates. So, a voter might vote for Alice, Bob, and Charlie, rejecting Daniel and Emily.
Approval voting uses such multiple votes. Instant-runoff voting and STV uses single ranked votes. In IRV, if no single candidate has 50% of the vote, then the candidate with the fewest votes is excluded and their votes are redistributed according to the voter's nominated order of preference. The process repeats itself until a candidate has 50% or more votes. The system is designed to produce the same result as an
exhaustive ballot but using only a single round of voting. Under STV, ranked voting is used in a proportional representation format. PR-STV is used in Australia, Ireland and Malta. Voters rank candidates to indicate first preference and back-up preferences. Quota is calculated. In say a four-seat constituency, quota is 20 percent of the valid vote plus 1 (if
Droop quota is used). Every candidate with quota (of 1st preferences alone or combination of first preferences and later preferences) will be elected. If a candidate has more than a quota and seats are yet to be filled, his/her surplus will be distributed to other candidates in proportion to the voter's preferences marked on the vote if any. If there are still candidates to be elected and no surplus votes to be transferred, the least-popular candidate is eliminated, as above in AV or IRV, and the process continues until four candidates have reached a quota or are declared elected when the field of candidates is thinned to the number of remaining open seats. In the
Quota Borda System (QBS), the voters also cast their preferences, 1,2,3,4... as they wish. In the analysis, all 1st preferences are counted; all 2nd preferences are counted; after these preferences have been translated into points per the rules of a
Modified Borda Count (MBC), the candidates' points are also counted. Seats are awarded to any candidates with a quota of 1st preferences; to any pair of candidates with two quotas of 1st/2nd preferences; and if seats are still to be filled, to those candidates with the highest MBC scores. In a voting system that uses a
ranked vote, the voter ranks the candidates in order of preference. For example, they might mark a preference for Bob in the first place, then Emily, then Alice, then Daniel, and finally Charlie.
Ranked voting systems, such as those used in Australia and Ireland, use a ranked vote. In a voting system that uses a
scored vote (or
range vote), the voter gives each alternative a number between one and ten (the upper and lower bounds may vary). See
cardinal voting systems. Some "multiple-winner" systems such as the Single Non-Transferable Vote, SNTV, used in Afghanistan and Vanuatu, allows a voter to cast one vote even though multiple members are elected in the district. The Condorcet rule is used (sometimes) in decision-making. The voters or elected representatives cast their preferences on one, some, or all options, 1,2,3,4... as in PR-STV or QBS. In the analysis, option A is compared to option B, and if A is more popular than B, then A wins this pairing. Next, A is compared with option C, then D, and so on. Likewise, B is compared with C, D, etc. The option which wins the most pairings, (if there is one), is the Condorcet winner.
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