What are the advantages and disadvantages of different electoral systems?

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A constant, albeit small, issue during general elections in recent years has been the possible transition of the UK from the majoritarian First Past the Post (FPTP) system to a more proportional one, such as Single Transferable Vote (STV). The main proponents of this system are the Liberal Democrats, whose former leader, Sir Menzies Campbell called their commitment to Proportional Representation (PR) “Absolute” (BBC News, 2007). The question remains however, what are the flaws with FPTP and which proportional system should be used to replace it, taking into account their implementation in other countries and their possible flaws.

The United Kingdom’s current system is a single member plurality system, meaning that the country is divided into single member constituencies, where a single candidate is chosen to represent a single constituency, requiring only a plurality of the votes, not a majority to win (the “First Past the Post” rule (Heywood, 2007)).

This system’s greatest advantage is that there is one representative for each geographical constituency. As a result a constituent knows who they have to speak to if they have an issue with which they require help. Other advantages include the creation of a strong government with a clear mandate which creates government stability as it is more often than not made up of one party.

The biggest problem with this system is the wasted vote issue, namely, all the votes made for a losing candidate and even many of the votes for a winning candidate are technically wasted, as the loser wins nothing and the winner did not require the extra votes above a plurality to win their seat. The system also means that a party with country wide support, but no focused local support can miss out on seats (The “third party effect” (Heywood, 2007)). Countries which use FPTP usually end up as a two party state, for example the domination of the Republicans and Democrats in America, the Conservatives and Labour in the UK, etc.

While many of these issues might seem trivial, they can have profound political and cultural effects, take for example the Northern Irish House of Commons, which from 1929 onwards, was elected using the First Past the Post system, giving the Ulster Unionist Party almost total dominance of the house (69.23% of the seats in 1965 compared to the 17.31% of the Nationalist party who came in second place (Nicholas Whyte, 2002)). The supposedly unfair system coupled with blatant gerrymandering led to much anger within the Nationalist community, and the parliament was eventually disbanded in 1972, leading to Northern Ireland being run from Westminster for almost 30 years.

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A modification on the standard FPTP system, traditionally used in France, is the Second Ballot System (SBS), which has the same single member geographical constituencies, but requires a candidate to have at an overall majority (At least 50%) to win. If this doesn’t occur, all but the two most popular candidates are removed and a run-off occurs between the two most popular.

The advantages of SBS are that it ensures a candidate has an overall majority in his seat, as well as helping to ensure a government obtains its mandate with a higher percentage of the popular vote than currently ...

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