A bond with a 8-year duration is worth $1071, and its yield to maturity is 7.1%. If the yield to maturity falls to 7.03%, you would predict that the new value of the bond will be approximately
Solution :
Inference for Duration or Volatility: For every one percentage increase in the yield or interest rate, price of the bond will decrease by the ( percentage of increase * duration ).
For every one percentage decrease in the yield or interest rate, price of the bond will increase by the ( percentage of decrease * duration. )
In the given case the bond yield is decreasing by ( 7.1 % - 7.03 % ) = 0.07 %
If the bond's yield decreases by 0.07 % then the market price will increase by = Duration * Percentage of decrease
= 8 * 0.07 % = 0.56 %
= 0.56 % ( when rounded off to two decimal places )
Thus the new bond price = $ 1071 + 0.56 % = ( 1071 * 1.0056 )
= $ 1076. 9976 ( when rounded off to four decimal places )
= $ 1077 ( when rounded off to the nearest whole number )
Thus the new value of the bond is approximately $ 1077, if the YTM fall from 7.1 % to 7.03 % .
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