来自《耶鲁大学开放课程：金融理论 第5集 第5集》

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  So obviously it's going to turn　out to have half the price.
  所以理应其价格也是一半
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  That's the fundamental　principle.
  这个是基本原理
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  We're doing it in the most　trivial case,
  我们运用它
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  but it's the most fundamental　principle of finance that if
  这个是最重要的金融原理
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  you've got two assets and　they're basically the same up to
  有两份资产他们是同档次的
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  scale then their prices have to　be the same up to scale.
  所以他们的价钱也应该是一样的
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  Who's going to bother to buy alpha if it costs the same
  如果α的产出比β少
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  amount as beta when it only produces half as much?
  谁还会买α呢
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  Yes?
  请讲
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  Is that the same thing as saying that their
  这个意思是不是
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  yields will converge, that equation?
  产出要符合方程
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  Prof: Well, it is something like that,
  十分类似这个