Google and Mastercard Cut a Secret Ad Deal to Track Retail Sales
An employee demonstrates face and fingerprint security on a smartphone at the MasterCard Inc. stand at the Mobile World Congress in this arranged photograph in Barcelona, Spain. (Photographer: Pau Barrena/Bloomberg)

Google and Mastercard Cut a Secret Ad Deal to Track Retail Sales

(Bloomberg) -- For the past year, select Google advertisers have had access to a potent new tool to track whether the ads they ran online led to a sale at a physical store in the U.S. That insight ...
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