That is still a fraction of Amazon's total, but there is no reason why Walmart should not catch up, thinks Simeon Gutmann of Morgan Stanley, an investment bank.

投资银行摩根士丹利的西蒙·古特曼认为，这仍然只是亚马逊总量的一小部分，但沃尔玛没有理由不迎头赶上。