NO.PZ2020021205000045
问题如下:
A trader wants to create synthetically a nine-month European put futures option on 1 million times an index. The futures price is USD 2,500, the strike price is USD 2,400, the risk-free rate is 2%, and the volatility of the futures price is 20%. What position should the trader take in futures contracts initially? How does this differ from the position the trader would take if he or she were hedging the same nine-month European put futures option on 1 million times the index?
选项:
解释:
The delta of a long position in a put option on a futures price is e-rT[N(d1 ) - 1]. In this case:
d1== 0.3223
and delta is
[N(0.3223) - 1] = -0.368
The trader should short futures contracts on 368,000 times the index initially to match the delta of the position that is desired. If the trader were hedging 1 million put futures contracts he or she would take a long position in futures contracts on 368,000 times the index.
我目前的理解是,为了对冲掉买1million index,现在要用put option来对冲。那我就是要算要long/short多少份option?
除了题目理解之外,还有以下两个问题
(1)为什么delta还要折现
(2)算出delta P 之后,是不是用nsΔs+npΔp=0 推出 np=(-nsΔs)/Δp=-ns/delta p,就变成了1million/-0.368了?