Under the risk neutral measure Q, assume that the bond price B(t,T) is related to the short

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Under the risk neutral measure Q, assume that the bond price B(t,T) is related to the short rate rt by

B(t, T) = ea(t)-b(t)rt t = T-t.

Define the following probability measures QT and QT∗ , where

dQT dQ dQT* dQ T -  ru du e B(t, T) T ru du B(T, T*) B(t, T*) e-Si

Consider a European call option on the T-maturity discount bond B(t,T) maturing at time T,T ∗. Let X be the strike price of the bond option and define

In T = Xa(T* - T) b(T* - T)Conditional on rt = r, show that the price of the bond option is given by

c(r, t) = B(t, T*) QT*[r

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