budding YORK, NY (MARKET WIRE) RATINGS UPDATES: Alliant Emerging Markets (AEM) upgraded Nigeria's Currency Inconvertibility and Transfer Risk rating to Medium Low from Medium following the power's impressive escalating in FX reserves. regardless of the expanding in reserves, Katie Dunn, Alliant Emerging Markets Vice President, said, "The country's credit gamble rating remains High as rising inflation approaches 10% amidst moronic pecuniary increase outside