A.社會(huì)保險(xiǎn)基金的外部效應(yīng)B.社會(huì)保險(xiǎn)基金的流動(dòng)性C.社會(huì)保險(xiǎn)基金運(yùn)營(yíng)的壟斷性D.信息不對(duì)稱(chēng)E.維護(hù)社會(huì)公眾利益