Preferential_block_voting
Preferential block voting is a majoritarian voting system for electing several representatives from a multimember constituency, such as a state. Unlike single transferable voting (STV) or list PR, preferential block voting is not a method for obtaining proportional representation, and instead produces similar results to plurality block voting (a type of multiple non-transferable vote, MNTV). Preferential block voting can be seen as a multiple-winner version of instant-runoff, a multiple transferable vote (MTV).
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Under both block voting and preferential block voting, a single group of like-minded voters can win every seat, making both forms of block voting non-proportional.