一事实创造了 网络外部性，这种外部性给予美元“ 现任优势 ” （ incumbency advantage）。
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Might the incumbency advantage save the Tories from the expected drubbing on May 1st?
ECONOMIST: Incumbency
If Rogan doesn't seek re-election, Republicans lose the advantage of incumbency in the district.
CNN: Treen, Vitter to face-off for Louisiana House seat
Yet the advantage of incumbency that helped him did not save unpopular governors.
ECONOMIST: After Cardoso��s big day
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