DALLAS — As debate continues nationally about restructuring the rating scales of municipal bonds, a suburban Dallas city received an upgrade on its general obligation debt to triple A.

Richardson plans to competitively offer $10.7 million of certificates of obligation Monday following an upgrade to AAA from AA-plus from Standard & Poor’s. Insurance will be at bidder’s option, although city finance director Kent Pfeil said the now gilt-edged underlying rating may negate the need for insurance.

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