Vote unitarity: Difference between revisions
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Vote Unitarity is the concept that each person should have one vote and that vote should not change in power during the tabulation in any system. It can be turned into a criterion in specific ways for specific classes of systems.
== [[Single Member system]]s ==
In single member systems this property is trivially satisfied due to the simplicity of such systems.
==[[Multi-Member System]]s==
In [[Multi-Member System|sequential multi-member methods]] this concept become especially relevant due to the different rounds of tabulation. Specifically, a voter whose favorite has been elected should not have influence over subsequent rounds. On the other side, a voter who has not been fully statisfied should still have some level of influence. This means that systems which allocate votes such as [[Single transferable vote]] and [[Sequential Monroe]] violate vote unitarity if they allocate the whole vote weight to a candidate the voter did not express maximal endorsement for. In [[Ordinal systems]] it is not possible to know how much influence should be lost at each round since only relative endorsement is given. In [[Cardinal voting systems]] the influence of each voter in each round goes down proportionally in relation to the amount of representation they have won in previous rounds.
==Creation==
Since [[Single Transferable Vote]] allocates voters it
==Relation To Similar Concepts==
===The test of balance===
The test of balance is [https://www.starvoting.us/equal_vote defined] as the following "Any way I vote, you should be able to vote in an equal and opposite fashion. Our votes should be able to cancel each other’s out."
Vote Unitarity is not incompatible with this but the concept of a Utilitarian Multi-Winner score system is. These systems do not aim to cancel out the will of opposing groups and leave them with nothing. They aim to find an compromise for all conflicting voters. Vote Unitarity helps to ensure fairness in the compromise.
[[Category:Voting system criteria]]
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