Yields on The Bond Buyer's weekly bond indexes plunged roughly 20 basis points this week, to the lowest levels in nearly 13 years, as strong demand and a weak economy continued to fuel the surging market.

The daily Municipal Bond Index's average yield to par call dropped 19 basis points, to a record low of 6.28% from 6.47% last Thursday. The Bond Buyer began calculating the yield to par call on July 2, 1984.

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