来自《耶鲁大学开放课程：金融理论 第4集 第4集》

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  Well, the first approach of economists was that equilibrium
  经济学家提出的第一个方法就是
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  maximizes the sum of utilities.
  均衡最大化效用的综合
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  So let's see how that works in this example.
  我们在例子中来看看他是如何运作的
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  So this example's very special because everybody thinks that
  这个例子非常特别 因为大家都认为
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  the good Y has constant marginal utility of 1.
  货品Y的边际效用不变且一直为1
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  So that's going to play a big role in our optimization in
  他在最大化效用的最优分配中
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  maximizing the sum of utility.
  它的作用十分重要
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  So if you want to maximize the sum of utilities you have to
  如果要最大化你的效用总和就必须最大化
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  such that X^a+X^b =84
  这样的X^a+X^b等于84
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  which is the sum of 4 and 80
  也就是4和80的和
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  and Y^ Y^ = 6,000.
  所以Y^a+Y^b=6000
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  So the claim is that if all these two million people meet in
  结论就是如果这两拨人像这样相见