第一题: the two year risk free rate in the UK is 8%, continuously compounded
the two year risk free rate in the France is 5%, continuously compounded
the current FF to the GBP is that one unit of GBP costs 0.75 units of FF
if the two year foweard rate is one unit of GBP is 0.85 units of FF, waht is the strategy you will take to make arbitrage profit?
A.borrow GBP, buy FF, and enter a short forward contract on FF
B. borrow FF, buy GBP, and enter a short forward contract on GBP
答案选B:
我的做法是:GBP/FF 0.75, the expected future rate should be (based on interest rate parity) 0.75*(1.05)^2/(1.08)^2< 0.85
所以FF将会被市场低估,GBP 将会被高估
所以我认为策略应该是A,借钱买FF,因为FF未来会被低估,所以short FF forward,来锁定利润,不知道我理解的对不对?
第二题:assuming the stock price and all other variables remain the same what will be the impact of an increase in the risk-free interest rate on the price of an American put option?
A. no impact
B. negative
C.positive
D.cannot be determined
答案选B
我的疑问:
1. interest rate 上升,折现后option price 下跌,但由于是American option,所以能够及早行权,那么相对于european option等其他权利来说,理所应当的价格增加,选C
2.答案的解释是,interest rate 上升,股东要求回报率上升,价格下跌,所以选B。假设答案是正确的,这道题没有那么复杂,那么这道题无论是American PUT/CALL 还是EUROPEAN PUT/CALL 应该都是negative 的影响,不知道对不对?


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