Walgreens is expanding its digital cooler doors ad network

Walgreens Boots Alliance said last month it planned to expand its trial of digital merchandising and advertising screens on the doors of refrigerated compartments. In an extension of this test that begun last year and is now deployed at 50 stores in Chicago, Walgreens will be sending the technology to 2,500 U.S. outlets in the next 12 to 18 months after finding it boosted sales more than traditional displays.