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陈Shelly · 2019年03月31日

问一道题:NO.PZ2019010402000015 [ CFA II ]

问题如下图:

选项:

A.

B.

C.

解释:

老师您好,这是我在魔鬼营错题集里看到的同学写的,不明白此处的value和settle为什么不一样?折现率不同这一点我明白,value为什么直接消掉了折现率呢?
2 个答案

包包_品职助教 · 2019年04月03日

同学你好,其实settlement 和Value的本质区别不是用哪一种方法算,而是value说的是估值,但是settlement说的是交割,估值我们一般就是在FRA到期前的任意时刻都可以求估值,而settlement则是发生在FRA到期的时刻。在T时刻,就是FRA到期的时候,求交割,我们就用(FRA-libor)乘以本金再折现。相当于我们签订了FRA,我们收到FRA乘以本金这么多利息,不签订FRA我们收到libor乘以本金这么多利息,那么签订FRA交割的金额就是两者相减再折现(就相当于算签订FRA带给我们的好处)。原版书也给出了计算公式。

而对于求value,其实就是画现金流,然后用向上箭头减去向下箭头,这个推导过程有点复杂,我给你推到一下,我们原版书上给出的公式是Vg(0,h,m) = {[FRA(g,h−g,m)−FRA(0,h,m)]tm}/[1+Dg(h+m−g)th+m−g],对于long FRA的一方来说,value就等于当前时刻签订一份相同到期期限的FRA减去我们合约中约定的FRA再乘以本金再折现。对于这道题中,如果此时当前时刻的FRA是合理定价的话,我们根据计算FRA的方法可以算出来FRA=discount rate。对于这道题的short方来说,那带进去就是:但是注意,这个方法只适合FRA是合理定价的时候,如果FRA没有合理定价,就不可以用,只能用最根本的公式用。:

 

 

 

 

 

包包_品职助教 · 2019年04月01日

value就是根据当前市场利率用向上箭头减去向下箭头那样算的,因为本金那一笔本身就发生在FRA到期时刻,所以不用折现。你看下我下面的图片,我画了这笔业务的现金流,settle是根据到期时市场上FRA报价计算的,也就是两个FRA轧差去年化再乘以本金再折现。

 

陈Shelly · 2019年04月02日

老师,这个地方我还是没太明白。Value是用t时刻的NP减去NP乘以FRA到现在的折现,这个地方是用到了折现的;相对而言,settlement是 NP-NP乘以FRA整体的折现。这个区别到底为什么呢?李老师,课程视频里讲的是t时刻的settlement.

包包_品职助教 · 2019年04月03日

我说了这个过程,你看看

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