BlackRock Favors Long Bonds at Priciest Since 2012: Muni Credit

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When it comes to the longest-dated municipal bonds, value is in the eye of the beholder.

The securities are delivering the best returns in the municipal market as yields approaching five-decade lows lead investors to take on more risk. The gains have driven yields on top-rated 30-year munis to 0.92 percentage point above debt due in 10 years, the smallest gap since December 2012, data compiled by Bloomberg show. The bonds have also grown costly compared with federal debt: Last week, interest rates on benchmark 30-year munis fell below those on similar-maturity Treasuries by the most since May 2013.