来自《耶鲁大学开放课程：金融理论 第9集 第9集》

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  your promises, the project is giving you the
  这笔投资可以提供你相应的
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  cash to keep your promises, so you lock in a profit for sure.
  承诺现金 这样你就稳赚 一笔
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  So if you knew the pis, you would know for sure how to
  所以如果知道这些π 那对于任何
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  value any project where you knew for sure the cash flows,
  现金流量已知的投资你都能确切估值
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  knowing the pis would tell you how to value it,
  这些π可以告诉你如何估值
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  and would tell you whether it was attractive or not attractive.
  并告诉你它是否有前景
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  You just look at how high the present value is.
  你只需要得出现值是多少
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  Okay, any questions about that?
  谁还有问题吗
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  So we just need to figure out how to deduce what the little
  我们需要做的就是从这些将要给出的
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  pis are from the data that we're going to be given,
  数据中解出π是多少
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  and that we are given every day by the market.
  市场会给出这些数据
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  Okay, so I said literally pi is the price you would pay
  这些π的字面含义是今天购买