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绝世小笼包 · 2019年03月13日

问一道题:NO.PZ2018123101000086

问题如下图:

    

选项:

A.

B.

C.

解释:



老师,请教一下。一般含权债券求value,不是用二叉树法来求吗?这题给的条件没法求得利率的二叉树:可以用f(2,1)求得R2HL,但是不知道sigma,没法求其他节点的利率是多少。这种情况怎么求含权债券估值呢?

1 个答案

吴昊_品职助教 · 2019年03月14日

这道题需要用到1-year forward rate,其实和二叉树的原理是一样的。二叉树里面的都是本节点到下一个节点的One-year forward rate,只不过二叉树里的Forward rate存在不同的可能。而我们这里就是单一的情况,也就是forward rate是确定的一个数值,不存在两种情况而已。其实原理都是一样的。

由于是callable bond,所以我们要考虑的是债券在将来是否会行权,从最后一年开始往前折现,用到的就是1-year forward rate进行折现,并比较一下每个时点是否触发了行权价。如果债券的折现值大于赎回价,说明触发了行权,发行人可以以行权价赎回,所以这时候就要把债券在第二年年末的现金流调整到债券的行权价100。重复此步骤,最终得到callable bond价值,从而求出embedded option的价值。



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NO.PZ2018123101000086 问题如下 Exhibit 1 shows par, spot, anone-yeforwarrates.Bon4 is a fixeRate Bon of Alpha Corporation, with 1.55% annucoupon ancallable pwithout any lockout perio. The bonmaturity is 3 years.Baseon the information above, the value of the embeeoption in Bon4 is closest to: A.nil. B.0.1906. C.0.8789. C is correct.考点考察对含权债券的理解解析债券4是可Callable。其价值为Value of callable bon= value of straight bon– value of call option on bon此,Embeecall option的价值为Value of call option on bon= Value of straight bon– Value of callable bon用Spot rate对该Straight bon行定价为1.55(1.0100)1+1.55(1.012012)2+101.55(1.012515)3=100.8789\frac{1.55}{{(1.0100)}^1}+\frac{1.55}{{(1.012012)}^2}+\frac{101.55}{{(1.012515)}^3}=100.8789(1.0100)11.55​+(1.012012)21.55​+(1.012515)3101.55​=100.8789无赎回保护期的可赎回债券的价值不能超过100,因此call option的价值为=100.8789–100=0.8789。 解析里Call option的Value是100.8789-100=0.8789,但是提问中回答是100.8789-100.5446=0.3343,哪种算法才是正确的呢?

2024-06-23 12:09 1 · 回答

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2024-04-25 19:15 1 · 回答

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2024-03-12 22:19 4 · 回答

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2024-01-23 22:26 1 · 回答