When you issue a bond, the coupon rate is fixed, the redemption is fixed but the yield rate is not fixed. Think about it this way, so when you buy a bond after issue for 1500 that is 1000 par value, you are getting a lower yield than if you bought it at 1000 because the coupon is fixed. While your statement the higher the coupon rate the higher the bond price and the higher the bond price the lower the yield is correct, the higher the coupon rate the higher the yield doesn't have to be correct. While coupon rate affects the value of a bond, if the coupon rate is over the required yield rate, it will sell at a premium so the high coupon rate doesn't necessarily cause a higher yield rate. While a high coupon does make it less risky so there is a correlation between yield and coupon rate, the coupon rate affects the bond price more.