来自《耶鲁大学开放课程：金融理论 第5集 第5集》

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  in other words a situation of laissez-faire,
  也就是放任主义制度
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  leads to allocations that are Pareto efficient.
  这种政策导致了Pareto效率
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  So they're in some sense good for the economy and good for the
  所以 在一定程度上讲
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  society.
  这是有利于经济和社会的
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  They don't maximize total welfare.
  他们并没有使社会福利最大化
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  That's not even a well-defined thing as we saw last time
  这甚至不是一个完全定义的概念
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  because how can you measure, how can you add one person's
  因为你没有办法测量它
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  utility to another.
  不能把对一人的效用强加在另一个人身上
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  It doesn't even make sense.
  这样就不合理了
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  So economists at first were wrong to think of that as the
  故最初把此作为良好的分配标准是错误的
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  criterion for good allocations, but there's another better
  后来 Pareto提出了一个更好的
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  definition of efficiency that Pareto invented,
  对经济效率的定义