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This March 7, 2019, photo shows a smart shelf area at Walgreen's in Chicago. Walgreens, which has more than 8,000 drugstores, installed cooler doors with cameras and sensors at six locations in Chicago, New York, San Francisco and Bellevue, Washington. Instead of the usual clear glass doors that allow customers to see inside, there are video screens that display ads along with the cooler’s contents. (AP Photo/Teresa Crawford)

This March 7, 2019, photo shows a smart shelf area at Walgreen's in Chicago. Walgreens, which has more than 8,000 drugstores, installed cooler doors with cameras and sensors at six locations in Chicago, New York, San Francisco and Bellevue, Washington. Instead of the usual clear glass doors that allow customers to see inside, there are video screens that display ads along with the cooler’s contents. (AP Photo/Teresa Crawford)

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