In the week ended Oct. 12, the weekly average yield to maturity of the Bond Buyer Municipal Bond Index slipped to 4.02% from 4.03% the previous week. The BB40 Index is based on the price of 40 long-term bonds.

The Bond Buyer's 20-Bond GO Index of 20-year general obligation yields fell two basis points to 3.61% from 3.63% the prior week. It is at its lowest level since Sept. 21, when it was at 3.60%.

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