In the week ended Sept. 14, the weekly average yield to maturity of the Bond Buyer Municipal Bond Index was unchanged from 3.98% 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 rose seven basis points to 3.56% from 3.49% the prior week. It is at its highest level since Aug. 17, when it was at 3.57%.

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