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The rationale underpinning all proportional representation (PR) systems is to consciously reduce the disparity between a party's share of the national vote and its share of the parliamentary seats. If a major party wins forty percent of the votes, it should win approximately forty percent of the seats, and a minor party with ten percent of the votes should also gain ten percent of the parliamentary seats. The use of party lists helps to achieve proportionality, whereby political parties present lists of candidates to the voters on a national or regional basis (see List PR). However, it can be achieved just as easily if the proportional component of an MMP system compensates for any disproportionality arriving out of the majoritarian district results (see Mixed Member Proportional). But preferential voting can work equally well: the Single Transferable Vote, where voters rank-order candidates in multi-member districts, is another well-established proportional system (see Single Transferable Vote).