If a bond is sold before it reaches maturity, any downgrades or upgrades in the bond's rating as well as other market factors will affect the price others are willing to pay for it.
Of course, because there is less risk of default, the interest rate for these securities is low compared to other bonds. For example, A1 is better than A2 but still not as good as Aa. Unauthorized duplication, in whole or in part, is strictly prohibited.