As demand for bonds increases, so do bond prices and bondholder returns. The many different kinds of bonds.Kathy Jones and Collin Martin give an overview of recent developments in the bond markets. Learn about how investors should evaluate bond performance. See how the maturity of a bond can impact its exposure to interest rate risk. The higher a bond's price is, the lower its yield will be. Here are the factors that make bond values fluctuate in the market. Supply and demand in the bond market. Why do interest rates go up and down? Certain investors may consider a move from cash into longer dated fixed income securities to potentially capture future price appreciation.