来自《耶鲁大学开放课程：金融理论 第3集 第3集》

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  So there's something special even about this example.
  因此这个例子还有一些特殊的地方
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  When we put in financial variables I'm going to argue you
  当我提出金融变量准备来说服你
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  shouldn't expect to get the optimal outcome all the time,
  不要一直期望获得最大的收益
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  but that'll be next class.
  但那将是下节课的内容
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  Yes?
  -请讲
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  Student: Beyond like arithmetic use is there any
  -在算数应用之外
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  reason you would choose to assume P_Y or
  是否有其他的理由你会选来假定P_Y或者
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  P_X is 1 or it's arbitrary?
  P_X是1或者它是任意的
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  Prof: No.
  -没有
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  There's no reason to pick P_X or P_Y
  没有任何理由来选取P_X或者P_Y
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  to be 1, whichever one you want you can choose to be 1,
  作为1 无论哪个你想选取作为1
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  and I keep going back.
  那么我会重头开始