
Explanation:
Correct answer: D — 900 years^2
For a zero-coupon bond priced with continuous compounding:
Differentiate twice with respect to yield/rate :
Therefore convexity is:
For :
So the answer is 900 years^2. In the continuous-compounding case, convexity for a zero-coupon bond depends only on maturity, not on the yield.
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Q-163.4. According to Hull, convexity () = ; the second derivative of bond price with respect to yield divided by bond price. Recall that if , then . What is the convexity, then, of a 30-year zero-coupon bond with yield of 8.0% under continuous compounding/discounting?
A
30 years^2 (“years^2” refers to the units only)
B
797 years^2
C
816 years^2
D
900 years^2
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