In the week ended Aug. 31, the weekly average yield to maturity of the Bond Buyer Municipal Bond Index was two basis points to 3.99% from 4.01% from 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 3.51% from 3.53% the prior week. It is at its lowest level since Aug. 3, when it was at 3.50%.

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