Google and Mastercard Cut a Secret Data Deal

Aug.31 -- 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 came thanks in part to a stockpile of Mastercard transactions that Google paid for. But most of the two billion Mastercard holders aren’t aware of this behind-the-scenes tracking. That’s because the companies never told the public about the arrangement. Bloomberg's Alistair Barr has more on "Bloomberg Technology."