Zero-sum game

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A zero-sum game is one in which no wealth is created or destroyed. So, in a two-player zero-sum game, whatever one player wins, the other loses. Therefore, the player share no common interests. Like other games, researchers distinguish between zero-sum games with perfect information and without.

From the candidates' perspective, a single-winner method is a form of "zero-sum game". There can be only one. It is usually an imperfect information game.

See also: Single-member district