When confidence is low, bond prices rise and yields fall as there is more demand for this safe investment. The spike in bond yields presents an opportunity for fixed income investors to earn capital gains and diversify portfolios.When interest rates are rising, you can purchase new bonds at higher yields. Learn about the relationship between bond prices and interest rates. By purchasing assets the central bank adds to demand for them, so their price increases and their yield falls. Treasury yield is the effective annual interest rate that the US government pays on one of its debt obligations, expressed as a percentage. Capital appreciation: Bond prices can rise for several reasons, including a drop in interest rates and an improvement in the credit standing of the issuer. In recent months, there has been a substantial increase in the supply of corporate bonds. People start trying to trade in their cash for bonds. The demand for bonds increases, which increases the price of bonds.