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In game theory
and economic theory, a zero-sum game is a mathematical representation of a situation in
which a participant's gain or loss is exactly balanced by the losses or gains
of the other participant(s). If the total gains of the participants are added
up, and the total losses are subtracted, they will sum to zero. Cutting a
cake is zero-sum game, because taking a larger piece reduces the amount of
cake available for others. In contrast, non-zero-sum describes a
situation in which the interacting parties' aggregate gains and losses is
either less than or more than zero. A zero-sum game is also called a strictly
competitive game. http://en.wikipedia.org/wiki/Zero-sum_game
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