Continuously Offered Longer-Term Securities. COLTS are sold by the World Bank, and are offered as one of three classes of bonds: 3-year to 30-year fixed rate bonds, variable rate bonds, or zero-coupon bonds.  type of bond that's been sold by the World Bank since 1989 in order to finance its operations. The bonds range in length from three to 30 years and can be fixed rate, … [Read more...]