An employee oversees sorting of packages at a logistics center in Lianyungang, Jiangsu province, on Monday. GENG YUHE/FOR CHINA DAILY Era of high-tech, stiff competition, big data pushes large firms to change focusCompetition in China’s online shopping sector is heating up as major e-commerce platforms are offering steep discounts and low-priced products to attract price-sensitive consumers and drum up sales during the year-end shopping extravaganza, experts said.They also noted that traditional online retailers such as Alibaba Group Holding Ltd and JD are doubling down on the low-price strategy to strengthen consumer engagement in the face of a massive challenge from online discounter PDD…