来自《耶鲁大学开放课程：金融理论 第7集 第7集》

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  So I'm going to do a few mortgage things.
  我要去做抵押贷款
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  I haven't defined mortgage yet.
  我还没讲过抵押的定义
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  Why didn't I do that?
  我竟然给忘了
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  So a mortgage is just a 30 year annuity.
  抵押金就是这三十年的年费
• 
  
  So one more thing--a mortgage is an annuity.
  补充一点 抵押金是年费
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  A fixed mortgage, a fixed rate mortgage is defined by a principal.
  固定抵押金的利率是由资本决定的
• 
  
  So when we talk about the crisis
  咱们讲到经济危机时
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  this word principal will come up all the time.
  资本这个词会频繁出现
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  So that's the face value, a principal,
  票面价值 资金
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  a mortgage coupon rate, and a maturity.
  抵押金票面利率 截止期限
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  This is a fixed rate mortgage.
  这是固定抵押贷款
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  So the most common kind of maturity is 30 years,
  通常合约期为三十年