来自《耶鲁大学开放课程：金融理论 第3集 第3集》

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  Now each of them is going to spend all their money.
  他们每个人都要花光所有的钱
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  He's going to spend all his money.
  他要花完他的钱
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  She's going to spend all her money.
  她也要花完她的钱
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  Because it's Cobb-Douglas, because it's logarithmic,
  因为它是柯布-道格拉斯 因为它的对数,
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  and you do this marginal utility stuff you find out,
  你做这些有关边际效用的东西 你就会发现
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  and this was the only trick, so this is a non-obvious trick
  这只是一个技巧 一个不太明显的技巧
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  which some senator and professional mathematician had
  由参议员以及专业数学老师
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  to invent,Cobb-Douglas is designed so
  发明 柯布-道格拉斯的发明
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  that you can say right away with those utility functions D is
  让你能在第一时间知道效用函数
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  clearly going to spend 2 thirds of her money buying X,
  D会花他2/3的钱来买进X
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  and C is going to spend 3 quarters of his money buying X.
  而C会花他3/4的钱来买进X
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  It's just obvious from the first order conditions,
  从一阶条件下