Reinvestment risk is the risk involved in reinvesting the proceeds received from the issuer against callable bonds. During falling interest rate periods, investor cannot reinvest at the same interest rates at which the earlier incomes were reinvested. In these situations, zero-coupon bonds are at an advantageous position as far as investors are concerned as the issuer reinvests the incomes. Higher the coupon on the bond, higher will be the reinvestment risk since the investors may go in for speculative investments.