Global advertising revenue is forecast to grow 8.9% in 2026, reaching $1.3 trillion – and for the first time since 1999, advertising’s share of global GDP is set to surpass the dot-com era peak. That is the headline finding from WPP Media’s This Year Next Year 2026 Global Midyear report, which marks a significant upward revision from the 7.1% growth projected just six months ago.
The engine behind the revision is largely AI. Increased investment from both AI-native companies and businesses adopting AI tools for operational efficiency has kept the industry resilient despite geopolitical tensions, rising oil prices and broader economic uncertainty. The United States, where AI investment is most concentrated, is expected to post ad revenue growth of 11.9% in 2026.
Three forces are identified as shaping the industry’s near-term trajectory: social media, retail media and generative search. Social media remains the largest advertising channel, though its growth is projected to slow from 2027 as consumer behaviour shifts, regulatory pressure mounts and AI-powered platforms intensify competition. Retail media networks continue to expand, while generative search – currently at $5.1 billion – is forecast to surpass $100 billion by 2030.
Traditional and generative search combined are expected to account for 21.8% of global ad revenue in 2026.
As AI increasingly mediates how consumers discover information and make purchase decisions, the report suggests brands may lean harder into channels that AI cannot easily disrupt – streaming, live sports, out-of-home and cinema – to sustain long-term brand recall.
