MEXICO CITY (Standard & Poor's) Dec. 14, 2006--Standard & Poor's Rating Services said today that it affirmed its 'B/B' counterparty credit and CD ratings on National Commercial Bank Jamaica Ltd. (NCB). The outlook is stable. "The ratings on NCB are constrained by the sovereign ratings on Jamaica, as sovereign bonds and loans to public entities represent most of NCB's assets," said Standard & Poor's credit analyst Leonardo Bravo. The ratings are also constrained by NCB's larger-than-peer loan concentration in its main clients, and its operating in a relatively small, highly indebted, and nondiversified economy. The ratings are supported by the bank's relevant market presence in the Jamaican banking system and consistent improvements in its operating performance. NCB maintains a large