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Jeff Bezos, chairman, president and chief executive officer of Amazon.com, second right, rings the bell to open the trading session at the Nasdaq MarketSite with Karin McKinnell, senior director of Nasdaq, left, John Wall, president of Nasdaq International, second left, and David Weild, executive vice president for office of the Nasdaq Chief Executive Officer, far right, in New York, U.S., on Friday, Sept. 7, 2001. Photographer: John Rizzo/Bloomberg via Getty Images

Jeff Bezos, chairman, president and chief executive officer of Amazon.com, second right, rings the bell to open the trading session at the Nasdaq MarketSite with Karin McKinnell, senior director of Nasdaq, left, John Wall, president of Nasdaq International, second left, and David Weild, executive vice president for office of the Nasdaq Chief Executive Officer, far right, in New York, U.S., on Friday, Sept. 7, 2001. Photographer: John Rizzo/Bloomberg via Getty Images

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NEW YORK - AUGUST 22: Amazon.com Founder & CEO Jeff Bezos poses for a photo before opening The NASDAQ Stock Market at the MarketSite Studio in Times Square August 22, 2003 in New York City. (Photo by Frank Micelotta/Getty Images for Amazon.com)

NEW YORK - AUGUST 22:  Amazon.com Founder & CEO Jeff Bezos poses for a photo before opening The NASDAQ Stock Market at the MarketSite Studio in Times Square August 22, 2003 in New York City.  (Photo by Frank Micelotta/Getty Images for Amazon.com)

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A truck pulling an Amazon Prime branded cargo container waits beside the entrance gate at Amazon.com Inc.'s new fulfillment center in Kolbaskowo, Poland, on Friday, Feb. 16, 2018. Both academic and commercial roboticists have been putting a lot of energy into solving whats sometimes referred to as the picking challenge, and Amazon is trying to direct that energy towards its specific needs. Photographer: Bartek Sadowski/Bloomberg via Getty Images

A truck pulling an Amazon Prime branded cargo container waits beside the entrance gate at Amazon.com Inc.'s new fulfillment center in Kolbaskowo, Poland, on Friday, Feb. 16, 2018. Both academic and commercial roboticists have been putting a lot of energy into solving whats sometimes referred to as the picking challenge, and Amazon is trying to direct that energy towards its specific needs. Photographer: Bartek Sadowski/Bloomberg via Getty Images

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Amazon corporate office building in Sunnyvale, California

Amazon corporate office building in Sunnyvale, California

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Amazon.com Inc. packages are seen inside a United States Postal Service (USPS) post office in Shelbyville, Kentucky, U.S., on Thursday, Dec. 22, 2016. More than 30 million packages handled by the USPS are estimated to be delivered on December 22, which is still a fraction of the 750 million packages this holiday season, a 12 percent increase over last year. Photographer: Luke Sharrett/Bloomberg via Getty Images

Amazon.com Inc. packages are seen inside a United States Postal Service (USPS) post office in Shelbyville, Kentucky, U.S., on Thursday, Dec. 22, 2016. More than 30 million packages handled by the USPS are estimated to be delivered on December 22, which is still a fraction of the 750 million packages this holiday season, a 12 percent increase over last year. Photographer: Luke Sharrett/Bloomberg via Getty Images