Electoral system: Difference between revisions
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Voting systems can be abstracted as mathematical functions that select between choices based on the [[utility]] of each option for each voter. This greatly resembles a [[social welfare function]] as studied in welfare economics and many of the same considerations can be studied. For aspects such as simplicity, dispute, and fraud, the practical implementation is far more important than the abstract function. However, the choice of abstract function puts some constraints on the implementation. For instance, certain voting systems such as First Past the Post, [[Schulze method|Schulze]], or Borda Count can be tallied in one distributed step, others such as IRV require centralization, and others such as multi-round runoff require multiple polling rounds.
== Definitions ==
[[Ballot]]: An expression of a voter's preference between the candidates.
Profile: Also known as preference profile, it is a [[ballot]] with a specific preference i.e. A>B>C indicates a voter prefers A over B and C, and prefers B over C. Can optionally be combined with a number beforehand, such as "34: A>B>C", which means "34 voters voted A>B>C". Because of the use of [[Fractional transfer|fractional surplus transfer]], sometimes a decimal number is used to indicate that only a fraction of a given set of ballots remains i.e. an A>B>C voter whose ballot has lost 50% of its weight is sometimes recorded as "0.5: A>B>C".
== List of Parliamentary Systems ==
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