The full-valuation approach works well for option-free bonds, but the analysis becomes more complicated if the bonds have embedded options, such as being callable or putable. For instance, if the bonds are callable, then any price increases are going to be capped by the call price and the price increase of the bond will slow as the call price is approached. If the bond is putable, then decreases in the bond price will have a floor at the putable price, which is usually par value. If the bond’s price falls below this, then the bondholder can sell the bond back to the issuer for the put price. Hence, the price decline slows as the put price is approached, then levels off at the put price.