IAB and PwC: US digital ad spending was up 22% YoY in 2018, exceeding $100B for the first time, mobile ads grew 40% YoY to $69.9B, video ads grew 37% to $16.3B
Anthony Ha / TechCrunch : See also Mediagazer
Context & Ripple Effects
The IAB and PwC's full-year tally confirms the run rate flagged in their first-half 2018 reading of $49.5B: US digital ad spending cleared $100B annually for the first time, with mobile carrying roughly two-thirds of it. The milestone lands on top of an already historic shift — per the IAB, online advertising had already overtaken combined broadcast and cable TV spend in 2017.
The report is also a checkpoint in a decade-long series: from $59.6B in 2015 through this $100B-plus year, and later readings show the curve bending — the same IAB/PwC series later recorded 7.3% growth in 2023 before a partial reacceleration, making 2018's 22% a peak-cycle data point rather than the new normal.
First-order effects
- Mobile ad spending grew 40% to $69.9B, meaning publishers and platforms selling desktop inventory were competing against buyers whose budgets had decisively shifted to phones.
- Video ad spending jumped 37% to $16.3B, well above the market's 22% overall growth rate, rewarding platforms and media companies with video inventory over display-only sellers.
Second-order effects
- Having passed broadcast plus cable TV in 2017 and still compounding above 20%, digital was pulling incremental budgets directly out of television — pressuring TV networks' upfront pricing power in subsequent cycles.
- With mobile at nearly 70% of all digital spend, ad-tech intermediaries and measurement vendors serving desktop-centric workflows faced shrinking addressable demand unless they rebuilt for in-app and mobile web formats.
Third-order effects
- If the pattern holds across the IAB/PwC series — growth decelerating from the low-20s percent range in the late 2010s toward single digits by the 2020s while totals multiply several-fold — the industry matures into a slow-growth, share-shift game where social and video formats take budget from search and display rather than expanding the pie alone.
- A market above $100B concentrated on two fast-growing formats gives regulators and platform gatekeepers leverage over a much larger pool of advertiser money than the 2015-era market did, raising the stakes of any policy change on mobile tracking or video distribution.
The trend: US digital advertising is maturing from hypergrowth into slower compounding, with each successive IAB/PwC cycle concentrating more of the budget into mobile-first and video formats at the expense of TV and desktop.