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Christina Johnson: How to Waste Less Money on Digital Marketing

Christina Johnson has been shown a 33x return on ad spend and kept a straight face. She has sat with a retail media network selling hundreds of millions of dollars in advertising whose own sales team couldn't explain to buyers whether the money had worked. And she can point to a supplier that ran a flawless campaign in cities where the retailer has no stores.

Christina Johnson spent years inside Walmart's retail media business before founding Advisar, an intelligence tool for retail media buyers. In this conversation, she and Noah break down why so many brands are flying blind on their ad…

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