The Impact of Electoral Design on the Legislature.

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The Impact of Electoral Design on the Legislature

The way that chief executives and legislators are elected in two-party and multiparty systems has an impact on various aspects of legislators’ primary roles and responsibilities. A major feature of political systems concerns the formula by which the seats are attributed to the winning legislative candidates (assuming the citizens can vote). Certain types of electoral systems may provide for greater stability and/or fewer opportunities for executive or government turnover when combined with other political factors. Changes in a system may reduce or increase political conflict. There are three broad categories of electoral design that are examined below (1) plurality-majority; (2) proportional representation; and (3) semi-proportional. Chart I provides a comparative analysis of the potential advantages of each type of system.

Electoral design influences legislative behavior by shaping circumstances under which a member wins election or re-election. Other important influences on those circumstances include: the perceived value of legislative seats, the degree of electoral competition, the system for nominating candidates, and the size of the district.

An additional variable to consider is constituency size. Constituency size varies considerably; from fairly discrete geographical units to whole countries (as in the Netherlands). Typically, the smaller the unit, the more homogeneous the interests and more likely it is that there is a single dominant interest or group. Conversely, greater size is associated with greater diversity and higher levels of electoral competition. Plurality-majority systems are often associated with smaller electoral districts, while proportional representation systems can range into the very large.

Plurality-Majority

Over half of the countries that conduct elections use this system. The most popular method that falls into this category is "First Past the Post" (FPTP), sometimes referred to as "winner-take-all." Elections are held in single-member districts (meaning there is one candidate running for one electoral seat for each party in a given geographic district). The candidate receiving the most votes wins the given legislative seat. Countries that use this system include the UK, Canada, US, Uganda and some Latin American countries. Another variant on the plurality-majority method (such as that used in France) is referred to as a "run-off election". This occurs when a candidate who does not receive an absolute majority in the electoral district is forced to compete again for votes against the other top candidate.

The main rational for this system is that it is less complicated and that it tends to produce elected representatives who are more closely linked to specific districts or regions. The representatives are therefore more likely to be oriented toward constituent service.

Proportional Representation (PR)

The most popular variant of this system is the "list" method, where parties devise a list of electoral candidates ranked in order. Elections are then held on either a national or regional basis with people voting directly for a party -- rather than a particular candidate (in some cases the party’s list of candidates is published in advance). The number of legislative seats per party are then determined according to the proportion of the vote won by each party. For example, a party winning 60 percent of the vote wins approximately 60 percent of the legislative seats; a party earning 30 percent of the vote, earns approximately 30 percent of the seats, and so on. There is typically a threshold of the vote (often around five percent) for a given party to obtain legislative seats. (The existence of a threshold may skew slightly the percentage of the vote vs. the percentage of seats obtained for each party.)

Most continental European countries use PR methods, as do many of the emerging democracies in Eastern Europe and the former Soviet Union. The rational for this system is that it reduces the disparity between a party’s share of the national vote and number of seats in parliament. For example, in a plurality-majoritarian system, a party’s candidates could theoretically win 51 percent of the votes in each regional election, resulting in that party obtaining all of the legislative seats at the national level despite nearly half of the voters not supporting the winners. With a PR system, the winning party in this scenario would obtain close to 51 percent of the seats, while the other successful parties who met a given threshold would share the remaining percentage.

Semi-Proportional

Semi-proportional electoral systems combine aspects of both plurality-majority and PR systems. The most common method of this system is termed "parallel," because it uses both the first-past-the-post and list systems simultaneously to elect legislators. For example, in a bicameral legislature, members of one house may be chosen by plurality-majority methods while members of the other are selected based on proportional representation. Alternatively, a certain number of legislative members in a given chamber may be chosen one way, with a percentage chosen by the other. For example, in Russia’s 1993 parliamentary elections, half of the Duma's (lower house of parliament) 450 seats were single-seat constituencies elected on a first-past-the-post basis; the other 225 were filled by proportional representation, with parties and blocs receiving seats according to the proportion of votes they won nationally. In those constituencies, voters cast two votes: one for a local candidate and another vote for one of the 13 blocs or parties registered to run in the election. A party needed at least five percent of the vote to enter the Duma.

The rational behind a semi-proportional system reflects an attempt to combine the positive elements of both the purely proportional and majoritarian systems: to have member representatives at a regional level while at the same time allowing for some representation of minority groups that would likely be left out of power in a majoritarian system. Other countries using this system and its variations include Germany, New Zealand, Lithuania, Hungary, Mexico and Bolivia.

Chart 1: Electoral Systems in Comparison: Common Advantages of Each System

The Classification of Electoral Systems 

Ever since the seminal work of Maurice Duverger (1954) and Douglas Rae (1971), a flourishing literature has classified the main types of electoral systems and sought to analyse their consequences (see Lijphart 1994; Lijphart and Grofman 1984; Blais and Massicotte 1996; Bogdanor and Butler 1983; Taagepera and Shugart 1989; Inter-Parliamentary Union 1993; Farrell forthcoming; Cox forthcoming). Systems vary according to a number of key dimensions (for a discussion see Lijphart 1994) including district magnitude, ballot structures, effective thresholds, malapportionment, assembly size, and open/closed lists, but the most important variations concern electoral formula.

Electoral formula determine how votes are counted to allocate seats. There are four main types (see Diagram 1): *majoritarian formulas (including plurality, second ballot, and alternative voting systems);

*semi-proportional systems (such as the single transferable vote, the cumulative vote, and the limited vote);

*proportional representation (including open and closed party lists using largest remainders and highest averages formula); and,

*mixed systems (like the Additional Member System combining majoritarian and proportional elements).

[DIAGRAM 1 ABOUT HERE]

Majoritarian electoral systems 

In a recent worldwide survey 83 out of 150 countries were found to use majoritarian systems (Inter-Parliamentary Union 1993). This is the oldest electoral system, dating back at least to the 12th Century, and also the simplest. This category can be subdivided into those requiring candidates to win a plurality, or an absolute majority (50+ percent) of votes to be elected.

Plurality Elections 

Plurality systems, otherwise known as 'first-past-the-post, is used for election to the lower chamber in 43 countries including the United Kingdom, Canada, India, the United States, and many Commonwealth states. The aim of plurality systems is to create a 'manufactured majority', that is to exaggerate the share of seats for the leading party in order to produce an effective working parliamentary majority for the government, while simultaneously penalising minor parties, especially those whose support is spatially dispersed. In 'winner take all', the leading party boosts its legislative base, while the trailing parties get meagre rewards. The focus is effective governance, not representation of all minority views. The basic system of simple plurality voting in parliamentary general elections is widely familiar: countries are divided into territorial single-member constituencies; voters within each constituency cast a single ballot (marked by a X) for one candidate; the candidate with the largest share of the vote in each seat is returned to office; and in turn the party with an overall majority of seats forms the government.

One feature of this system is that single-member constituencies are based on the size of the electorate. The United States is divided into 435 Congressional districts each including roughly equal populations with one House representative per district. Boundaries are reviewed at periodic intervals, based on the census, to equalise the electorate. Yet the number of electors per constituency varies dramatically cross-nationally: for example India has 545 representatives for a population of 898 million, so each member of the Lok Sabha serves about 1.6 million people, while in contrast Ireland has 166 members in the Dáil Eireann for a population of 3.5 million, or one seat per 21,000 people. The geographic size of constituencies also vary substantially within countries, from small, densely-packed inner-city seats to sprawling and more remote rural areas.

Under first-past-the-post candidates usually do not need to pass a minimum threshold of votes(2), nor do they require an absolute majority to be elected, instead all they need is a simple plurality i.e. one more vote than their closest rivals. Hence in seats where the vote splits almost equally three ways, the winning candidate may have only 35% of the vote, while the other contestants get 34% and 32% respectively. Although two-thirds of voters supported other candidates, the plurality of votes is decisive.

In this system the party share of parliamentary seats, not their share of the popular vote, counts for the formation of government. Government may also be elected without a plurality of votes, so long as they have a parliamentary majority. In 1951, for instance, the British Conservative party was returned to government with a sixteen seat majority in parliament based on 48.0 percent of the popular vote, although Labour won slightly more (48.8 percent) of the vote. In February 1974 the reverse pattern occurred: the Conservatives won a slightly higher share of the national vote but Labour formed the government. Moreover under first-past-the-post governments are commonly returned with less than a majority of votes. No governing party in the UK has won as much as half the popular vote since 1935. For example in 1983 Mrs Thatcher was returned with a landslide of seats, producing a substantial parliamentary majority of 144, yet with the support of less than a third of the total electorate (30.8 percent).

For minor parties, and for minority social groups, the spatial concentration of votes in this system is critical to the outcome. Parties like the Greens with shallow support spread across a wide range of constituencies do far less well than those like nationalist parties with a strong concentration in key regions. Hence, for example, in the 1993 Canadian elections the Progressive Conservatives won 16.1 percent of the vote but suffered a chronic meltdown to only two MPs. In contrast the Bloc Quebeçois got 18.1 percent of the vote but a solid phalanx of 54 MPs. The New Democratic Party won even less votes (6.6 percent) but emerged with 9 MPs, far more than the Conservatives. In a similar way social groups who can concentrate their support spatially, like African-American or Latino voters in urban areas, can prove relatively more effective in getting their representatives into the US Congress than groups which are widely dispersed across legislative districts (Rule and Zimmerman 1992).

Second Ballot Majority-Runoff Systems 

Other systems use alternative mechanisms to ensure that the winning candidate gets an overall majority of votes. In France the second ballot 'majority-runoff' system is used in elections for the Presidency. Candidates obtaining an absolute majority of votes (50 percent+) in the first round are declared elected. If this is not the case a second round is held between the two candidates who got the highest number of votes. This system is used in 15 of the 25 countries with direct presidential elections including Austria, Columbia, Finland and Russia. In the 1996 Russian Presidential election, for example, 78 candidates registered to stand for election, of which 17 qualified for nomination. Boris Yeltsin won 35.3 percent of the vote on the first round, with Gennadii Zyuganov, the Communist candidate, close behind with 32 percent, and Alexander Lebed third with 14.5 percent of the vote. After the other candidates dropped out, and Lebed swung his supporters behind Yeltsin, the final result was a decisive 53.8 percent for Yeltsin against 40.3 percent for Zyuganov (White, Rose and McAllister 1996). A majority-runoff is also used in legislative elections in Mali and the Ukraine, and a plurality-runoff is used for the French National Assembly. The aim of runoff elections is to consolidate support behind the victor, and to encourage broad cross-party coalition building and alliances in the final stages of the campaign.

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Alternative Vote 

Another majoritarian system is the Alternative Vote which is used in elections to the Australian House of Representatives and in Ireland for Presidential elections. Australia is divided into 148 single-member constituencies. Instead of a simple 'X', voters rank their preferences among candidate (1,2,3...). To win, candidates need an absolute majority of votes. Where no-one gets over 50 per cent after first preferences are counted, then the candidate at the bottom of the pile with the lowest share of the vote is eliminated, and their votes are redistributed amongst the other candidates. The process continues until an absolute majority ...

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