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Describe the convexity of a bond. When pricing bonds under what circumstances is convexity a problem?

Describe the convexity of a bond. When pricing bonds under what circumstances is convexity a problem?

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Solution:

Bond price and yield are inversely related. The change in bond price can be measured by duration and convexity. Duration measures the linear relation and convexity measures the non-linear relation between bond price and yield. Convexity is basically the second derivative of the bond price with respect to the yield.

Formula for the convexity is

CFt .2 Convexity Pxa P Bond price. y = Yield to maturity in decimal form. T Maturity in years. CF Cash flow at time t

Limitations of convexity

  1. When coupon is very high then convexity will be low and it will not be very useful as change in price can be found by duration only
  2. For normal (straight) bonds the impact is very small as compared to bonds with special features like callable, sinking fund bonds etc.
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