The market may have long since moved on from Moody’s downgrade of China to A1 from Aa3 (by now even long-only funds have learned that in a world with $18 trillion in excess liquidity, the opinion of Moodys is even more irrelevant), but for Beijing the vendetta is only just starting, and in response to Tuesday’s downgrade, China’s finance ministry accused the rating agency of applying “inappropriate methodology” in downgrading China’s credit rating, saying the firm had overestimated the difficulties faced by the Chinese economy and underestimated the country’s abilit