Suppose the price of a bond is dependent on the price of a commodity, denoted by Q

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Suppose the price of a bond is dependent on the price of a commodity, denoted by Qt . Let the stochastic process followed by Qbe governed by

dQt Qt =a dt +o dZ.By hedging bonds of different maturities, show that the governing equation for the bond price B(Q,t) is given by [see (7.2.8)]

bla  + at 2 2  ag2 + (a - ho) Q  aQ - r B = 0,

where λ is the market price of risk and r is the riskless interest rate. Since the commodity is a traded security (unlike the interest rate), the price of the commodity should also satisfy the same governing differential equation. Substituting Q for B into the differential equation, show that 

= r.

Argue why the governing equation for the bond price now takes the same form as the Black–Scholes equation, which has no dependence on the risk preference.

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