Apple was the most valuable publicly traded U.S. firm for most of last year, even becoming the first such firm to reach a valuation of $1 trillion. But it was Microsoft that ended the year on top after Apple's shares took a pounding over the last few weeks of 2018. Investors dumped Apple due to worries about weak iPhone sales. But today, as many new smart speakers were on display at the Consumer Electronics Show in Las Vegas, it was only fitting that Amazon became the most valuable publicly traded U.S. company. After all, Amazon created the smart speaker category with the global launch of ...


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