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
The incumbency advantage is also the issue in the flap this anniversary week over how much credit Mr Obama should claim for ordering America's navy SEALs into Pakistan to kill Osama bin Laden.
ECONOMIST: Lexington
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
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