In game theory, a zero-sum game is any game where the total winnings equal the total losses.
For example if you and I bet each other $5 on the outcome of a race – if you win, I give you $5, and if I win, you give me $5. That’s a zero-sum game, because the winner gets +$5, the loser gets -$5, and the total of wins and losses is $0.
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