S4 Capital Executive Chairman Sir Martin Sorrell tells Yahoo Finance Executive Editor Brian Sozzi that Meta's Muse puts it at the forefront of agent-to-agent marketing, and that by his estimate Google, Meta, Amazon and TikTok now take more than half the ad market. Sorrell explains why brands will matter more when AI agents shop for you, why data isn't the enemy of good advertising, why he thinks companies are doing too well to adopt AI at scale, and what's next for FIFA and the World Cup.
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