A salesman arranges milk products at a supermarket inside an IAPM mall in Shanghai in this file photo. China will complete its product quality traceability system by 2020, according to a guideline jointly issued by the Ministry of Commerce and nine other central departments. The traceability system would target key products, including farm produce, food, medicine, special equipment, dangerous materials and rare earth. The system will provide information regarding sources, destinations and accountable persons to reinforce product quality and safety.Xinhua