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In Mixed-Member Proportional representation system electors have two votes first for an MP and second for party. My question is there some figure of how many people vote for party in second vote different from the MP's party in the first?

The reason I ask this is that if most people vote for same party in their second vote as the MP's party in the first vote then why have two votes? Why not have one vote for an MP like any first past the post system then from that calculate how many votes each party got?

  • That’s two questions. You should edit to limit it to one question at a time. For the first question, there definitely are statistics from Germany at least. – chirlu Apr 3 '18 at 19:32
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    @chirlu, I don't need answer to second question. I just added that so that people know why I am asking. – MrDi Apr 3 '18 at 19:34
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    Can you link to the statistics from Germany please? – MrDi Apr 3 '18 at 19:35
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    For the record, there's an issue with the logic in your second paragraph, that shows up more clearly in the related question "if most people vote for party X, why have party Y?". – origimbo Apr 3 '18 at 19:58
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New Zealand has used an MMP system since 1996.

In the 2017 general election, 27.33% of voters split their vote (that is, used their candidate vote for a candidate of a party different from that for which they used their party vote).

In general, splitting votes is much more common for supporters of minor parties. Of those who voted for National or Labour (the two major parties), only 14.13% and 22.94% of voters respectively split their vote. In comparison, of those who voted for the Greens, NZ First, or ACT (the three minor parties who hold seats), 66.62%, 59.06%, and 81.27% of voters split their vote.

This makes sense, as typically general electorates are won by either National or Labour (unless a major party endorses a smaller party for a particular electorate). A supporter of a minor party will typically vote for either the National or Labour candidate with their candidate vote, and vote for their preferred minor party with their party vote.

These figures is broadly in line with previously elections, with 31.64% split in 2014 and 30.70% split in 2011.

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