carrefour store Disciplines The Retail Ad Empire: How Stores Became the New Media Giants In Brief: The most powerful advertising platforms in 2025 aren’t Google or Meta — they’re supermarkets, marketplaces, and e-commerce apps. Retailers are turning their transaction data into gold, building retail media networks (RMNs) that sell ad space across websites, apps, in-store screens, and delivery boxes. The result: a new By Tobias Dahlberg • 3 min read