The relationship between yield and
interest rates is fundamental to understanding the dynamics of the financial markets. Yield refers to the return on investment generated by a particular
financial instrument, such as a
bond or a
stock. It represents the income an
investor receives from holding that instrument over a specific period of time. On the other hand, interest rates are the cost of borrowing or the return on lending capital, set by central banks or determined by market forces.
In the context of fixed-income securities like bonds, the relationship between yield and interest rates is inverse. When interest rates rise, bond prices generally fall, resulting in an increase in yield. Conversely, when interest rates decline, bond prices tend to rise, leading to a decrease in yield. This inverse relationship is known as the
interest rate risk.
To understand this relationship, it is crucial to grasp the concept of coupon payments. Bonds typically pay periodic interest payments, known as coupons, to bondholders. These coupon payments are usually fixed at the time of issuance and are based on the bond's face value and
coupon rate. When interest rates rise, newly issued bonds offer higher coupon rates to attract investors. As a result, existing bonds with lower coupon rates become less attractive, leading to a decline in their
market value.
Consider an example where an investor purchases a bond with a fixed coupon rate of 4% when prevailing interest rates are also 4%. In this scenario, the yield on the bond matches the prevailing interest rate. However, if interest rates increase to 5%, newly issued bonds may offer a coupon rate of 5%. As a result, the original bond with a 4% coupon rate becomes less desirable in comparison. To compensate for this discrepancy, the price of the original bond must decrease, which increases its yield to align with the higher prevailing interest rate.
Conversely, when interest rates decline, newly issued bonds may offer lower coupon rates. In this situation, existing bonds with higher coupon rates become more attractive, leading to an increase in their market value. As the price of these bonds rises, their yield decreases to align with the lower prevailing interest rate.
It is important to note that the relationship between yield and interest rates is not linear. The magnitude of the change in bond prices and yields depends on various factors, including the bond's
maturity, coupon rate, and the time remaining until maturity. Generally, longer-term bonds are more sensitive to changes in interest rates compared to shorter-term bonds. This sensitivity is known as duration risk.
Furthermore, the relationship between yield and interest rates extends beyond fixed-income securities. In equity markets, the
dividend yield of stocks can also be influenced by changes in interest rates. When interest rates rise, investors may shift their focus from stocks to fixed-income securities, leading to a decrease in stock prices. Consequently, the
dividend yield of stocks may increase as a result of this inverse relationship.
In summary, the relationship between yield and interest rates is inverse for fixed-income securities like bonds. When interest rates rise, bond prices generally fall, resulting in an increase in yield. Conversely, when interest rates decline, bond prices tend to rise, leading to a decrease in yield. This relationship is driven by the dynamics of coupon payments and the attractiveness of newly issued bonds. Understanding this relationship is crucial for investors and financial market participants to make informed decisions and manage their portfolios effectively.