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Advertising and marketing news: the campaigns, rulings, appointments and numbers worth knowing this week.

OpenAI's headquarters building at 1515 Third Street, San Francisco
Amazon 13 Sep

Amazon starts selling ads inside ChatGPT

A US pilot puts ChatGPT's ad inventory inside Amazon's DSP as a managed service, with Delta Vacations among the first in. A new medium just got a sales house.

The John Lewis department store on Oxford Street, London
John Lewis 11 Sep

John Lewis raises brand spend 29% while losses widen

An £89m first-half loss, £246m into the brands, and a pan-partnership loyalty scheme in build. The John Lewis Partnership is betting its recovery on the second half, which means Christmas.