In these systems, parties make lists of candidates to be elected, and seats get allocated to each party in proportion to the number of votes the party receives. Voters may vote directly for the party, as in Hong Kong and Israel, or they may vote for candidates and that vote will pool to the party, as in Turkey and Finland.
There are two major and important variations of Party List systems, usually defined as closed list and open list elections: i.e. the order in which the party's list candidates get elected may be pre-determined by some method internal to the party (a closed list system) or they may be determined by the voters at large (an open list system).
There are many variations on seat allocation within party-list proportional representation. The three most common are:
List PR may also be combined in various hybrids (e.g. using the Additional member system).
The unmodified Sainte-Laguë method and the LR-Hare method rank as the most proportional followed by LR-Droop; single transferable vote; modified Sainte-Laguë, D'Hondt and largest remainder Imperiali. While the allocation formula is important, equally important is the district magnitude (number of seats in a constituency). The higher the district magnitude, the more proportional an electoral system becomes.
The opposition and the economy: Mexico. (Pres Ernesto Zedillo of the Institutional Revolutionary Party does not receive congressional approval for out-of-country travel and may not have his proposed budget approved because the Congress is controlled by opposition parties of National Action Party and Party of the Democratic Revolution and their budget priorities are different)(Brief Article)
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