NEW YORK--(BUSINESS WIRE)--Market participants have expressed concern over a perceived increase in the incidence of widely divergent U.S. municipal ratings. One area in which Fitch Ratings' opinion differs from some other rating agencies' is the conditions under which dedicated tax backed (DT) debt may be rated higher than the general credit quality (GO debt) of the issuing municipality. A notable example is the divergent ratings on the City of Chicago, IL sales tax bonds, which carry ratings r