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APPENDIX 1: Partial Derivative of the Price with Respect to the Yield

APPENDIX 1

Partial Derivative of the Price with Respect to the Yield

From the bond-pricing equation, we know that

image

The derivative of the second term with respect to the yield is

image

which is obviously negative.

We will now demonstrate that the derivative of the first term is also negative by considering the present value of an annuity that pays $A per period.

image

We need to show that the term in the bracket is positive or, in other words, that

image

From the expression for a Maclaurin series, we know that

image

Thus, it is indeed the case that

image

Hence, the partial derivative of the present value of the annuity with respect to the discount rate is negative. Because the bond price consists of an annuity and a terminal cash flow, the derivative of whose present value has already been shown to be negative, we conclude that the partial derivative of the price of a plain vanilla bond with respect to the YTM is negative.


  

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