One plus side of MMP,from others I talked to was if you knew who the main parties were merging with prior to election would help the party vote,i.e Nats with Act,Greens,etc.
And from another viewpoint,the best person for electorate could be different from party vote.Whanganui as an example 2004 elections,a few voted for Labour as mp and National as party vote(reading results),due to sitting mp having done a good job for electorate but wanted different party vote.
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