来自《耶鲁大学开放课程：博弈论 第24集 第24集》

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  Goods that I consume, they have no investment value,
  我消耗的物品 他们没有投资价值
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  they have no resale value.
  他们没有再出售的价值
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  So think about some good being sold on eBay.
  所以想一想一些在易趣网出售的物品
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  It's a cake, say.
  比如一个蛋糕
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  So if I buy it, once I've eaten it, I can't resell it.
  如果我买下吃掉之后 我就不能再出售它了
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  I can't have my cake and resell it.
  我不能吃了我的蛋糕然后再卖了它
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  So think about pure consumption goods over here.
  所以想一想纯消耗品
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  And even in these pure consumption goods
  即使在这些纯消耗品中
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  I mustn't get any psychological value out of thinking
  我不能在"我得到了这个蛋糕而你没有"的这个情况中
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  I managed to get that cake and you didn't.
  得到任何心理上的快感
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  So the private value case is really an extreme thing,
  所以私人价值真的是很极端的东西
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  but it turns out to be a useful abstraction
  但当我们考虑得更长远时