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Portfolio B contains a European put option and a share. Compare this with the alternative of cash, currently worth ke -r(T-t) - . At time
Portfolio B contains a European put option and a share. Compare this with the alternative of cash, currently worth ke-r(T-t)- . At time T portfolio B will be worth at least as much as the cash alternative. Why must Portfolio B be worth at least as much as the cash alternative?
What is the lower bound for a 3-month European put option on Share X if the share price is 95, the exercise price 100 and the risk-free rate 12% pa?
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