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Signage is displayed outside the new Amazon Go grocery store in Seattle, Washington, U.S., on Tuesday, Dec. 6, 2016. Amazon.com Inc. unveiled technology that will let shoppers grab groceries without having to scan and pay for them -- in one stroke eliminating the checkout line. Photographer: David Ryder/Bloomberg via Getty Images

Signage is displayed outside the new Amazon Go grocery store in Seattle, Washington, U.S., on Tuesday, Dec. 6, 2016. Amazon.com Inc. unveiled technology that will let shoppers grab groceries without having to scan and pay for them -- in one stroke eliminating the checkout line. Photographer: David Ryder/Bloomberg via Getty Images