Dangdang has two kinds of goods. One is Dangdang's self-operated goods, and the other is the goods of the settled merchants. Either way, there is no guarantee that it is completely authentic. However, compared with the settled merchants, the quality of Dangdang's self-operated goods is still guaranteed, because merchants need to go through complicated procedures to become Dangdang's suppliers, such as original factory (brand) certificate, brand authorization letter, customs clearance certificate (customs clearance certificate), tax bill, etc.