That's because government used to support them unconditionally, now since the state-runned banks are allowed to be listed on the market that means goverment is unable to support them anymore. I think 国有商业银行 is high risk stock, i don't wanna touch them.
hesell : 2006-10-27#4
too big to fail, 不单单只针对国有银行,在美国,大银行都受到政府的支持,因为银行是整个金融经济的中心,银行风险马上会传播到地产,股市,经济各领域。无论公私,只要需要,每个政府都会拯救。当然,美国银行风险对国民经济影响相对小,因为美国的风险控制好,另外,美国最大5家银行的总合,在整个美国银行界所占的百分比,低于欧洲,亚洲。