Asda Finds Its Radio Ads Actually Worked, and Has the Receipts to Prove It

The advertising industry has spent the better part of a century trying to close the gap between what people hear and what they buy, a pursuit that has generated countless methodologies, several fortunes, and at least one apocryphal John Wanamaker quotation.

Now Experian and Bauer Media say they have accomplished something rather more concrete for Asda, the British supermarket chain: they connected an audio advertising campaign to actual grocery purchases and found that the spots delivered more than 20 times their cost in return on advertising spend.

The campaign, which ran across Bauer Media's audioXi digital audio network, was planned by Spark Foundry, part of the Publicis Groupe media agency network. Rather than stopping at the usual metrics — reach, impressions, the comforting abstraction of "engagement" — the measurement effort matched listeners who heard the ads to their subsequent spending behavior, using Experian's transactional data drawn from roughly one in ten British credit and debit accounts.

The results, according to the companies, showed that listeners exposed to the campaign spent 13 percent more than a control group and were 27.5 percent more likely to remain Asda customers. (Whether they were buying the store-brand digestive biscuits or the premium ones was not disclosed.)

"Advertisers are under growing pressure to demonstrate what their media investment is delivering for the business," said Debbie Oates, director of customer engagement at Experian Marketing Services, in a statement that could have been issued in 1995 or 2025 with equal accuracy.

The analysis also identified which demographic segments responded most strongly, intelligence that Spark Foundry said it would use to refine future campaigns.

For Bauer, which operates Kiss, Absolute Radio and other stations reaching more than 14 million weekly listeners in Britain, the study offers a talking point in an era when audio advertising must increasingly justify itself against the targeting capabilities of digital platforms.

For Asda, it offers something rarer: evidence that the ads did what ads are supposed to do.

Original story published in Adweek: "Asda campaign delivers more than 20x return on ad spend through Experian and Bauer measurement"