Sistemas electorales

Topic IndexAdvantages and disadvantages of Two-Round System (TRS)

Advantages of TRS

First and foremost, TRS allows voters to have a second chance to vote for their chosen candidate, or even to change their minds between the first and the second rounds. It thus shares some features in common with preferential systems like the Alternative Vote, in which voters are asked to rank-order candidates, while also enabling voters to make a completely fresh choice in the second round if they so desire.
TRS can encourage diverse interests to coalesce behind the successful candidates from the first round in the lead-up to the second round of voting, thus encouraging bargains and trade-offs between parties and candidates. It also enables the parties and the electorate to react to changes in the political landscape that occur between the first and the second rounds of voting.
TRS lessens the problems of ‘vote-splitting’, the common situation in many plurality/majority systems where two similar parties or candidates split their combined vote between them, thus allowing a less popular candidate to win the seat. Also, because electors do not have to rank-order candidates to express their second choice, TRS may be better suited to countries where illiteracy is widespread than systems which use preferential numbering like the Alternative Vote or the Single Transferable Vote.

Disadvantages of TRS

TRS places considerable pressure on the electoral administration by requiring it to run a second election a short time after the first, thus significantly increasing both the cost of the overall election process and the time that elapses between the holding of an election and the declaration of a result. This can lead to instability and uncertainty. TRS also places an additional burden on the voter in terms of time and effort required to cast the vote as the voter has to make it to the polling station twice, and sometimes there is a sharp decline in turnout between the first round and the second.
TRS shares many of the disadvantages of FPTP. Research has shown that in France it produces the most disproportional results of any Western democracy, and that it tends to fragment party systems in new democracies.
One of the most serious problems with TRS is its implications for deeply divided societies. In Angola in 1992, in what was supposed to be a peacemaking election, rebel leader Jonas Savimbi came second in the first round of a TRS presidential election to Jose dos Santos with 40 per cent of the vote as opposed to dos Santos’ 49 per cent. As it was clear that he would lose the run-off phase, he had little incentive to play the democratic opposition game and immediately restarted the civil war in Angola, which went on for another decade. In Republic of the Congo in 1993, prospects of a government landslide in the second round of a TRS election prompted the opposition to boycott the second round and take up arms. In both cases, the clear signal that one side would probably lose the election was the trigger for violence. In Algeria in 1992, the candidate of the Islamic Salvation Front (Front Islamique du Salut, FIS) led in the first round, and the military intervened to cancel the second round. The results of the 2011 election in Liberia led to violence when the candidate from the opposition, Winston Tubman, called to boycott the second round alleging fraud during the first one. However, both rounds were won by then president Ellen Johnson Sirleaf.

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