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Despite worldwide objections, the US administration decided to impose a 25-percent tariff on steel imports and a 10-percent tariff on aluminum, with tariffs on imports from countries including China.

Device announcements in late summer and early fall have become common among tech giants in preparation for the busy holiday season. Earlier this month, Amazon unveiled a number of new Fire TV devices, including a new smart soundbar, a second-generation Fire TV Cube and more.

Digital technology is accelerating the integration of economic and social fields. This is speeding up China's consumption, which is undergoing rapid development in areas such as the number of internet users, mobile apps and payments.

Despite the strong results, Amazon stock is down slightly in after-hours trading. That’s because Amazon’s projections for the first quarter of this year came in below what analysts expected.

Despite the well publicized roll out of Amazon Go, numerous customers still needed to be told how it works. A couple were surprised to learn that after picking up items they could just walk out and the order would be charged automatically.