The industry baseline was $1.32 trillion in both 2026 and 2027. I forecast that number does not hold. Between the Iran war, oil prices squeezing advertisers, and the 2026 World Cup shifting money into a few weeks, global media spend contracts 2 years running.
In 2026 it drops 7%, a $92 billion cut, landing at $1.23 trillion. In 2027 it drops another 6%, a $73.7 billion cut, landing at $1.15 trillion. That is $166 billion wiped off the market versus the baseline. For context on the trend line, actual global media spend ran $0.99 trillion in 2023, $1.09 trillion in 2024, and $1.20 trillion in 2025. The momentum was up. War and oil reverse it.
The US and Israel went to war with Iran on 28 February 2026. The Strait of Hormuz is still contested, oil is expensive, and ships get hit almost daily. This is no longer proxy chess. Advertising budgets are the first line CFOs cut when energy, freight, and uncertainty rise together.
The cut is not spread evenly. Meta and Google are automating the whole advertising machine with AI, so brands buy straight from the platform with nobody in between. Ads inside AI answers can pass $300 billion by 2035, see my LLM Advertising card. The shrinking pie flows to the platforms, and the agency layer in the middle eats the loss. Advertising may win quarters. Innovation wins decades.