GroupM has a math problem. The numbers behind the agency model no longer add up. The economics that allowed GroupM to become one of the ad industry’s main powerbrokers are changing to the point where GroupM's high-volume, low-margin business is at risk. Read more below.

• GroupM's turnaround plan will face the challenge of transitioning whilst maintaining revenues and ebitda, when previously they were largely accrued through methods at odds with the new order for clients and agencies.
• Publishers pitted Taboola and Outbrain against one another for years. But as a merged company, the content recommendation giant will have few opportunities to throw its weight around.
• Last week, the European Union Court of Justice ruled that using pre-ticked consent boxes in order to drop cookies is not legally valid under GDPR. Businesses now must have “active consent” from consumers. Here's a primer.
• CMOs are focused on growth but getting there requires a deeper connection with consumers that isn't so transactional, according to ANA speakers.