Credit ratings have well-known weaknesses and they tend to reflect reality too late for investors. They still give a good picture of what is going on. On Tuesday, Fitch upgraded the long-term issuer default rating of MBB (Military Commercial Joint Stock Bank) to ‘B+’ from ‘B’ with a stable outlook In a report released the same day, the agency also upgraded the viability rating of Vietcombank and Vietinbank to ‘b’ from ‘b-’. “The positive rating action takes into account the Vietnamese banking system’s enhanced operating environment, with improved economic policymaking from authorities promoting macroeconomic stability and predictability,” Fitch noted.