The Relation between Bond Prices and Yields
§Consider a 2 year, 10% coupon bond with a $1000 face value.  If the bond yield is 8.8%, the price is 50       + 1000/(1.044)4 = 1021.58. 
§Now suppose the market bond yield drops to 7.8%.  The market price is now given by 50        + 1000/(1.039)4 = 1040.02. 
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§As the bond yield drops, the bond price rises, and vice-versa.