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Problem 3 Consider a derivative that pays off si at time T, where St is the stock price at time T. When the stock price
Problem 3 Consider a derivative that pays off si at time T, where St is the stock price at time T. When the stock price follows geometric Brownian motion, it can be shown that its price at time t for tst has the form h(t, T) S" where S is the stock price at time t and h is a function only of t and T. (a) By substituting into the Black-Scholes-Merton differential equation, derive an ordinary differential equation satisfied by h(t,T). (b) What is the boundary condition for the differential equation for h(t,T)? (c) Show that h(t, T) = e[0.50_n(n-1)+r(n-1)](T-t) where r is the risk-free interest rate and o is the stock price volatility. = Problem 3 Consider a derivative that pays off si at time T, where St is the stock price at time T. When the stock price follows geometric Brownian motion, it can be shown that its price at time t for tst has the form h(t, T) S" where S is the stock price at time t and h is a function only of t and T. (a) By substituting into the Black-Scholes-Merton differential equation, derive an ordinary differential equation satisfied by h(t,T). (b) What is the boundary condition for the differential equation for h(t,T)? (c) Show that h(t, T) = e[0.50_n(n-1)+r(n-1)](T-t) where r is the risk-free interest rate and o is the stock price volatility. =
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