Negative vote weight

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Negative vote weight (also known as inverse success value) refers to an effect that occurs in certain elections where votes can have the opposite effect of what the voter intended. A vote for a party might result in the loss of seats in parliament, or the party might gain extra seats by not receiving votes. This runs counter to the intuition that an individual voter voting for an option in a democratic election should only increase the chance of that option winning the election overall, compared to not voting (participation criterion) or voting against it (monotonicity criterion).