来自《耶鲁大学开放课程：博弈论 第5集 第5集》

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  then your individual payoffs are as follows.
  那么你们的收益就是这样的了
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  Here's the good news. You're going to get a profit of $5.
  好消息 各位会分得5美元利润
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  The way this is going to work is you're going to invest $10
  也就是说你们投资了10美元
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  so you'll make a gross profit of $15 minus
  得到了15美元的毛利润 但是减去
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  the $10 you originally invested for a net of $5.
  之前投资的10美元净利润就是5美元
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  So a net profit. So $5 net profit, that's the good news.
  好消息就是各位能获得5美元净利润
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  But that requires more than 90% of the class to invest,
  但这要求不少于90%的同学
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  greater than or equal to 90% of the class to invest.
  选择了投资10美元
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  If more than 90% of the class invests,
  如果多于90%的同学投资了
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  you're going to make essentially 50% profit.
  那么你们会获得50%的利润
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  Unfortunately, the bad news is you're going to lose your $10,
  然而坏消息就是 如果投资的人数
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  get nothing back so this is a net loss,
  少于90%的话