Suppose the forward rate volatility under the one-factor HJM model takes the form show that the Jamshidian

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Suppose the forward rate volatility under the one-factor HJM model takes the form 

OF(t, T) = 01 +0[1 - e-(T-1)],

show that the Jamshidian decomposition technique (Jamshidian, 1989) cannot be used to price an option on a coupon bearing bond with coupon payment date Ti,i = 1, 2, ··· ,n. Find an approximation price formula to the European call option on a coupon bearing bond whose weight wi(r, t) is defined by (8.2.12).

The short rate process under the given volatility structure is non-Markovian. The stochastic duration is the solution D(t) to the following equation

( +)?D()* + gul  e-Dup [1 - - ( + 62) w;(r, t)(T;  1) + +   ; (r, t)[1  e-a(T;-1) i= 2

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