The Gap That Never Closes: A Historical Study of Attention-Spend Mismatches, 2013-2026

A pattern that has now repeated at least twice, in public data

Media economics gives us two clean, independently documented cases of the same phenomenon: attention moving to a new surface faster than advertising dollars follow it there. The first is mobile in the early 2010s. The second is digital audio, most visibly podcasting, roughly a decade later. Reading them side by side turns a single anecdote into a pattern.

2013: the mobile gap, documented in real time

Mary Meeker's KPCB "Internet Trends" report, the most closely watched annual deck in the industry at the time, showed in its 2013 edition that US consumers were spending roughly 12 percent of their media time on mobile devices, while mobile devices captured only about 3 percent of total ad spend. That is a fourfold gap between where attention already was and where advertising money had followed.

The gap did not close overnight. Subsequent editions of the same report tracked the mismatch narrowing gradually over roughly five years, reaching something closer to equilibrium by around 2018. The lag itself, roughly half a decade between the attention shift becoming visible and ad spend meaningfully catching up, is the part of the story that matters most for understanding the next case.

The 2016 to 2023 replay: digital audio

The same structural pattern reappeared on a different surface a decade later. IAB's 2023 Internet Advertising Revenue Report found digital audio accounted for roughly 20 percent of adult US time spent with digital media, while capturing only about 3.1 percent of digital ad revenue. A separate WARC analysis, comparing audio time-spent against brand ad-spend more broadly, found consumers spending roughly 31 percent of media time with audio formats against roughly 9 percent of brand ad spend, a smaller but still substantial gap by that measure. Both figures are industry system-of-record reports; the WARC figure specifically should be read as a vendor-produced analysis and treated as directional rather than definitive.

Podcast advertising specifically kept growing through this period, up 17.6 percent year over year to $2.862 billion in 2025 per IAB and PwC's tracking, yet its share of total internet ad revenue held essentially flat at 2.8 percent. Growth in absolute dollars and a flat share of the total pie can both be true at once, and that combination is precisely what an unclosing gap looks like in the data: the medium is not being ignored, it is being underweighted relative to the attention it commands, persistently, not briefly.

The macro picture: the market corrects, unevenly and with lag

The broadest available data confirms that ad-dollar allocation does move toward attention-rich surfaces over time, just unevenly. IAB and PwC's Internet Advertising Revenue Report for full-year 2025 recorded total US internet ad revenue at $294.6 billion, up 13.9 percent year over year, with social media advertising the fastest-growing major format at $117.7 billion, up 32.6 percent, even as podcast and audio's revenue share stayed flat despite rising time-spent in the same period.

That contrast, one format repricing quickly, another lagging for years despite comparable attention growth, is the empirical signature of a market that corrects toward attention, but format by format and with meaningfully different lag times rather than a single, uniform, fast repricing across every surface at once.

Why the gap does not close on its own, or close quickly

A gap this persistent is not simply inattention on the part of advertisers; it reflects real friction in how ad budgets get reallocated. Existing campaigns, agency relationships, measurement tooling, and organizational habit are all built around the channels a business already knows how to buy on. A new surface, even one already carrying substantial attention, has to overcome that inertia before it captures a proportional share of spend, and that process visibly takes years rather than months in both documented cases here.

This is also why the gap is a genuine opportunity rather than only a risk: an under-priced, attention-rich surface stays under-priced for a meaningfully long window before the broader market corrects, which is exactly the period in which an early, well-measured move onto that surface carries the most relative advantage.

What the historical pattern implies about today's surfaces

If the pattern from mobile and digital audio holds, whatever surface is currently absorbing a rising share of attention while carrying a proportionally smaller share of ad spend, in a specific business's specific market, is worth identifying directly rather than assumed from the last decade's example. The historical record does not tell a business which surface that is today; each of the two documented cases was a different medium, discovered by measuring time-spent against ad-spend directly, not by pattern-matching from the prior decade's gap.

What the history does establish, credibly and across two independent, decade-apart cases, is that this kind of gap is a repeating structural feature of ad markets, not a one-off anomaly. That is the argument for measuring a business's own current attention-spend gap directly, rather than assuming the market has already closed it just because enough time has passed since the last documented case.