In 2016, eMarketer, after tracking 180 of the largest e-commerce firms, estimated that total sales of e-commerce firms amounted to approximately US$200 billion, of which the largest 25 accounted for more than US$159 billion;
2016年，eMarketer跟踪了180家最大的电商之后估计，电商总销售额约为2000亿美元，而其中最大的25家占到了1590多亿美元。