来自《耶鲁大学开放课程：金融理论 第4集 第4集》

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  The essence of an asset is that it's something that you hold today
  资产的特别在于你之所以在今天持有它
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  because later it's going to deliver you money or goods or something."
  是因为在日后它会为你带来金钱 商品等
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  And we're not going to talk about money
  因为我们不准备说金钱
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  so we're imagining these are all real assets.
  所以可以想象一下说的都是有形资产
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  So they're going to deliver goods in the future.
  所以它们以后会为你带来一些物品
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  So the definition of an asset is an asset, remember,
  所以资产的定义是 这个要记好
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  we have to make it mathematical,
  我们要数学地表达它
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  so Fisher started this society to make economics mathematical.
  所以Fisher建立这个学会让经济学数学化
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  So an asset is literally something that delivers goods in the future.
  概括来说资产就是在未来带来商品的东西
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  So an asset is defined by its payoffs, D_X and D_Y.
  一份资产由它的收益定义 D_X和D_Y
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  So we can call that asset alpha, an asset alpha is defined
  我们可以称之为阿尔法资产
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  by its payoffs, D_X and D_Y.
  阿尔法资产由它的收益决定 D_X和D_Y