INTEREST RATE RISK results from increases and decreases in bond prices caused by changes in interest rates. When interest rates rise, the prices of bonds fall to compensate for the higher level of income demanded by investors. Bonds that carry less than the new market rate of interest must sell for lower prices. For example, if an investor purchases a bond at par value ($1,000) with a 7% coupon and interest rates rise to the point where the same bond later yields 9%, the bond will decline in price to the point where its yield to maturity is equivalent to the yield to maturity on a 9% current coupon. In other words, the investor will earn the prevailing market rate of 9%- by buying a bond priced at par with the 9% coupon, or by buying the bond at a discount to par with a 7% coupon.
PAR VALUE is a. the maturity value or face value, i.e., the amount that an issuer agrees to pay at the maturity date; b. the official exchange rate between two countries currencies; or, c. the value of a security that is set by the company issuing it; unrelated to market value.
YIELD is the annual return on an investment, expressed as a percentage. The yield to redemption or maturity (the same thing) combines the running yield with the "pull to redemption"; thus a bond which has a 10% coupon and exactly one year of remaining life will sell at $98.2% when interest rates are at 12.0%, that 12.0% being composed of 10.2% running yield and 1.8% pull to redemption ($100.0 - 98.2%).
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