来自《耶鲁大学开放课程：博弈论 第13集 第13集》

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  and they don't particularly want to see your parents on the streets.
  而且他们也不希望看到你父母露宿街头
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  The way in which this works is not so much
  担保的真正意义不是在于
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  that it gives an extra positive return to the lender,
  给贷方提供额外的净收益
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  the way in which it works
  它的真正作用是
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  is it gives an extra negative return to the borrower.
  给借方带来了额外的负收益
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  So let's just do this backward induction again
  下面我就再使用一下逆向归纳法
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  with the house in place.
  看看房子的问题吧
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  So with this house in place, as before,
  现在加入了房子因素 和以前一样
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  you'll return the loan up here,
  在这种情况下你会还钱
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  but now provided you like your parents enough,
  现在如果你真的爱你的父母
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  you would also return the loan here
  在这种情况下你还会选择还钱
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  because you prefer $2 to $3 minus your parent's house,
  因为2美元比3美元减你父母的房子要好