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When using the Hare quota, this rule is called Hamilton's method, and is the third-most common apportionment rule worldwide (after Jefferson's method and Webster's method). [ 1 ] Despite their intuitive definition, quota methods are generally disfavored by social choice theorists as a result of apportionment paradoxes .
[1] [10] Of these countries, many do not use the zipper system evenly across legislative bodies, or have additional requirements. In France only bodies elected by proportional systems use the zipper system. [11] Zimbabwe uses the zipper system in Senate elections and only requires 60 out of the 80 seats apply the zipper system. [12]
Multi-winner electoral systems at their best seek to produce assemblies representative in a broader sense than that of making the same decisions as would be made by single-winner votes. They can also be route to one-party sweeps of a city's seats, if a non-proportional system, such as plurality block voting or ticket voting, is used.
Closed list systems are still commonly used in party-list proportional representation, and most mixed electoral systems also use closed lists in their party list component. Many countries, however have changed their electoral systems to use open lists to incorporate personalised representation to their proportional systems.
Poster for the European Parliament election 2004 in Italy, showing party lists. Party-list proportional representation (list-PR) is a system of proportional representation based on preregistered political parties, with each party being allocated a certain number of seats roughly proportional to their share of the vote.
The Webster method, also called the Sainte-Laguë method (French pronunciation: [sɛ̃t.la.ɡy]), is a highest averages apportionment method for allocating seats in a parliament among federal states, or among parties in a party-list proportional representation system.
In political science, parallel voting or superposition refers to the use of two or more electoral systems to elect different members of a legislature. More precisely, an electoral system is a superposition if it is a mixture of at least two tiers, which do not interact with each other in any way; one part of a legislature is elected using one method, while another part is elected using a ...
Exact proportionality is never achieved under PR systems, except by chance. The use of electoral thresholds that are intended to limit the influence of small, extreme parties will reduce proportionality in list systems, and any insufficiency of leveling seats will further reduce proportionality in Mixed-member proportional or Additional-member systems.