来自《耶鲁大学开放课程：金融理论 第4集 第4集》

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  So why should that be the case?
  为什么这个很重要呢
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  In fact in this example it is the case.
  事实上这个例子很很好的说明了问题
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  Well why is it the case?
  为什么是这个例子呢
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  Because there's constant marginal utility of Y,
  因为我们的边际效用一直不变且为Y
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  so we don't have to worry about the Y allocation at all because
  所以我们完全不用担心Y的分配
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  if you increase Y^ and decrease Y^ they still have
  因为如果你提高Y^a减少Y^b
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  to add up to 6,000.
  他们的总和还会是6000
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  You're going to be lowering A's utility and raising B's utility
  如果你降低的A的效用和提高B的效用的量
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  by the same amount so you won't have changed the sum of utilities.
  是相同的 那么你就不会影响效用的总和
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  So the Y's are totally irrelevant to this maximizing
  所以这些Y和最大化
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  the sum of utilities.
  效用的总和完全无关
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  So all we have to do is make sure that the X allocation,
  所以我们必须保证X的分配