MONTERREY, Mexico--(BUSINESS WIRE)--Fitch Ratings has affirmed Municipality of La Plata's (MLP) Long-term foreign and local currency Issuer Default Ratings (IDRs) at 'CCC'. The ratings are capped by Argentina's Country Ceiling, which Fitch last downgraded on July 31, 2014 to 'CCC' from 'B-'. KEY RATING DRIVERS The affirmation of MLP's ratings considers its adequate fiscal and budgetary performance, generating sound operating margins over the last years despite the pressures on operating expendi