Consider the two-factor Gaussian model, which is a combination of the HoLee and Vasicek models. Let the

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Consider the two-factor Gaussian model, which is a combination of the Ho–Lee and Vasicek models. Let the volatility structure in the HJM framework be given by 

o(t, T) = 0 and o(t, T) = 02 0e-k(T-1)

Show that the bond price B(t, T) is given by (Heath, Jarrow and Morton, 1992).

B(t, T) = where B(0, T) B(0, t) X(t): exp = =S M(t, T) = M(t, T) = -M(t, T) - M(t, T)  0 (T  1)Z(1)  7/[1

Also, show that the yield to maturity R(t, T) is normally distributed with mean μR(t, T) and variance σR(t, T)2:

UR(t,T) = In B(0,T) B(0,1) T-t OR(t, T) = oft + + M (t, T) T-t M(t, T) T-t +P- 1 - e-2kt). 0 [1-e 2k3 +

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