In my opinion Zerohedge.com may offer the best economic analysis you can get. In an article today, we can read that after: "the latest terrible economic data, the Shanghai Composite dropped 2.7%, but it was the retail darling Shenzhen Composite which tumbled 6.7% - its worst selloff since August 25, while China's Nasdaq, the ChiNext crashed -7.5%" and "things behind the scenes in Shanghai are far worse than they seem."