As brands test Amazon's direct link between digital ads and Whole Foods purchases, they spot new data nuggets — and gaps

When Amazon unveiled new digital ad products in 2019 to reach people who shop at its few brick-and-mortar AmazonFresh stores, company watchers forecasted the inevitable: eventually, advertisers would be able to connect in-store purchases made at Amazon-owned Whole Foods back to the digital ads Amazon showed them. This February, the...