Majority bonus system
The majority bonus system (MBS) is a form of semi-proportional representation used in some European countries. Its feature is a majority bonus which gives extra seats or representation in an elected body to the party or to the joined parties with the most votes with the aim of providing government stability.
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It is used in San Marino, and Italy from 2006 to 2013. In Argentina it is used in the Chamber of Deputies of the Province of Santa Fe, Chubut, and Entre Ríos. Greece used the system before abolishing it in 2016 but the law will not take effect until the second election after it was passed, so the majority bonus system was used in the 2019 election before being abolished officially.