Bolivia elects on national level a head of state – the president – and a legislature. The president and the vice-president are elected for a five-year term by the people. The National Congress (Congreso Nacional) has two chambers. The Chamber of Deputies (Cámara de Diputados) has 130 members, elected for a five-year term using the Additional Member System, and in the case of seven indigenous seats by usos y costumbres. The Chamber of Senators (Cámara de Senadores) has 36 members: each of the country's nine departments returns four senators allocated proportionally.
Bolivia has a multi-party system, with numerous parties. During the first 23 years of renewed democracy beginning 1982, no one party succeeded in gaining power alone, and parties had to work with each other to form coalition governments. Since 2005, a single party has achieved a parliamentary majority.
Ahead of any national election a period of prohibition takes effect. This is with the intention of preventing inebriated nationals voting in error. Nationals are also forbidden from travelling around during the same period. This is to prevent voters from voting in more than one district. On polling day it is difficult to obtain a taxi or bus, due to the limitations placed upon travel and transport.
The president is directly elected by the people, by majority. A candidate has to receive at least 50% of the vote, or 40% of the vote, and 10% more than the second candidate to be elected, otherwise a second round is held with the top two finishers to determine the winner.
The 130 members in the Chamber of Deputies (Cámara de Diputados) (excluding the seven special seats) are elected using the additional member system. 63 seats are elected in single-member districts using first-past-the-post voting. 60 additional seats are elected using closed list party-list proportional representation in districts of varying sizes corresponding to Bolivia's nine departments.
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Les systèmes mixtes sont des systèmes électoraux dans lesquels on intègre (scrutin mixte à finalité proportionnelle) ou bien on adjoint (scrutin parallèle) un scrutin majoritaire à un scrutin proportionnel afin d'élire une assemblée législative. Dans certains cas, il s'agit de compenser les conséquences de la surreprésentation d'une liste ayant obtenu le plus de voix dans le cadre d'un scrutin majoritaire. Cela a pour effet que des listes minoritaires soient quand même représentées au sein de l'assemblée concernée.
thumb|400px|Système électoral utilisé pour élire la chambre basse par pays. Système majoritaire Système semi-proportionnel Système proportionnel Système mixte Autre Le 'système électoral, mode de scrutin', système de vote ou régime électoral, désigne tout type de processus permettant l'expression du choix d'un corps électoral donné, souvent la désignation d'élus pour exercer un mandat en tant que représentants de ce corps (élection), ou moins souvent le choix direct (référendum) d'une option parmi plusieurs.
The mixed single vote (MSV) or positive vote transfer system (PVT) is a mixed-member electoral system, where voters cast a single vote in an election, which used both for electing a local candidate and as a vote for a party affiliated with that candidate according to the rules of the electoral system. Unlike the more widespread mixed proportional and mixed majoritarian systems (such as parallel voting) where voters cast two votes, split-ticket voting is either not possible or not allowed in MSV.
Voting can abstractly model any decision-making scenario and as such it has been extensively studied over the decades. Recently, the related literature has focused on quantifying the impact of utilizing only limited information in the voting process on the ...