... (Muni/Treasury)2 2.14% 3. 25% 65.85%5 3. 25 4 .37 5 74.297 3. 76 4.50 83. 5610 4.25 4.875 87.1815 4.82 5.00 96.4020 4.82 5.25 91.81 30 5.15 5 .37 5 95.81June 2002richexpensive,pricey, costingmore money, ... viablebusiness again.The reason for the distinction between investment-grade and high-yield bonds is because at one time bankswere allowed to invest only in bonds ranked in the topfour rating ... beused for other things.INSURED BONDSSome investors like the added peace of mind that comeswith buying insured municipal bonds. They are willing toforgo some yield to have an insurance company...