Session 14: Fixed Income: Valuation Concepts Reading 56: Valuing Bonds with Embedded Options 
 LOS f: Explain the effect of volatility on the arbitrage-free value of an option. 
  
  
As the volatility of interest rates increases, the value of a callable bond will: 
 
 
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rise if the interest rate is below the coupon rate, and fall if the interest rate is above the coupon rate. |    |  
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As volatility increases, so will the option value, which means the value of a callable bond will decline. Remember that with a callable bond, the investor is short the call option.   |