A fall guy is the person who someone decides will be the loser or victim.

VOA: special.2010.02.21

And if you're thinking negative, it means you will be always a loser.

如果你一直想法消极，就意味着你将一直是个失败者。

问上门厨师 - SpeakingMax英语口语达人

It's measured by subsequent performance in the amount by which the winner wins equals the amount by which the loser loses, but it costs a lot to play the game.

之后的业绩表现可判输赢,而且赢方赚的钱,就等于输方赔的钱,但是交易本身会产生巨大的成本

耶鲁公开课 - 金融市场课程节选

If security selection is a zero-sum game, the amount by which the winner wins equals the amount by which the loser loses -winners and losers being defined by performance after a security selection that has been made -well, that sounds like a zero-sum game.

如果证券选择是一个零和博弈,赢方赚得的金额,等于输方赔付的金额,谁赢谁输取决于,双方投资在证券选择后的表现,这听起来确实像个零和博弈

耶鲁公开课 - 金融市场课程节选