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Falcon · 2018年05月07日

问一道题:NO.PZ2016031201000051 [ CFA I ]

问题如下图:

    

选项:

A.

B.

C.

解释:



1.protective put with a forward contract 应该怎么理解?

protective put 不是stock加上 put 吗?   

with a forward contract 那就再long 个  forward contract 

应该是long put,long stock 和long forward contract

怎么stock 变成  risk-free bond?
 

2.本题的另一个回答提到
long put+long forward= long call 
这怎么理解? 


   

1 个答案
已采纳答案

竹子 · 2018年05月08日

1. 这一题考的是put-call-forward parity,它的推导逻辑如下:

因为 long stock+short forward 可以合成一个无风险头寸,即Long risk-free bond(注意这里的bond面值为远期合约价格,即FP)

将该等式变形可得: long stock=long forward+long risk-free bond

所以proctive put with asset= long put+long stock中的stock可以用上面粗体的公式替代,可得:

protective put with forward= long put+long forward +long risk-free bond

 我们发现无论期末股票价格如何变化,protective put with forward的payoff与fiduciary call是一样的。具体过程如下图:



这里再强调一遍,protective put with forward中的bond面值为FP,而fiduciary call中的bond面值为X。

再引申一下:既然它们两者期末的payoff是相同的,那么这两个组合期初的成本就应该相同,不然就可以套利。

protective put with forwad成本等于put option期权费+bond在期初的现值(远期合约在期初不用付钱,没有成本),即=P0+FP/(1+Rf)^T;而fiduciary call成本= C0+X/(1+Rf)^T,它们两者相等,所以就可以得到put-call-forward parity的公式。

 

2.  long put+long forward=long call 你画图就很清楚了。

 

chensy · 2018年09月29日

为什么 long stock+short forward 能够合成一个无风险头寸啊

竹子 · 2018年09月29日

买了股票 担心股票价格下跌,那我就short forward锁定一个卖出的价格,这样就能回避价格下跌的风险啦

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