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Evian, CFA2021-09-13 16:20:55
同学└(^o^)┘你好,
Assume a call option’s strike price is initially equal to the price of its underlying asset. Based on the binomial model, if the volatility of the underlying decreases, the lower of the two potential payoff values of the hedge portfolio:
题干里面t=0时刻,说的“strike price=X”和“the price of its underlying asset=S0”是一样大小。这个意思是说t=T时刻,S1-,也就是股票下跌的价格只会比X和S0都低,此时call option不行权,无论S1-跌多少,波动有多大,S1-至始至终都笔S0和X低,不行权就是IV=0,价值不变。
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