#189 2024 · JCDecaux Spain · Out-of-home advertising
JCDecaux made a stranger with 28 followers famous using its own unsold subway ads, to prove subway ads work
问题
Brands wrote off Madrid's subway ad space as low-value, and subway ad investment fell 7% in a year
背景
Madrid's underground carries more than 2.3 million riders a day, but advertisers had decided subway ad space was less relevant and effective than street-level billboards, and subway ad investment fell 7% in 2023. The usual response — sales decks citing reach numbers, discounted rate cards — hadn't reversed the perception.
JCDecaux Spain had hundreds of unsold ad spaces sitting empty across the network at any given time, generating no revenue and proving nothing to skeptical brands. A conventional pitch would tell a brand what the space could do; nobody had used the empty space itself to demonstrate it live.
换别人会怎么做
The standard response to declining ad investment is a better sales pitch — sales decks citing reach numbers, ridership statistics, discounted rate cards — arguing to skeptical brands why the subway space they'd already written off was actually more valuable than they believed.
他们看到了什么
JCDecaux saw that brands had already learned to discount reach numbers in a sales deck, so no deck, however well-argued, was going to reverse a perception problem built on distrust of exactly that kind of claim. The unsold ad space itself, hundreds of empty spots generating no revenue and proving nothing, was the one thing JCDecaux had that a skeptic couldn't dismiss as a sales claim, so instead of describing what the space could do, they used the space to actually do it, live and verifiably, turning an unknown stranger into a real, trackable public figure using nothing but the inventory itself.
那一手
David Madrid filled JCDecaux's unsold subway ad spaces with the Instagram posts of a real, unknown woman — 28 followers, no fame, no story — and let the campaign run as her account grew, using the ad space as the mechanism of her fame rather than describing the space's reach in a pitch.
为什么管用
Running a real Instagram account, an actual unknown woman with 28 followers, through JCDecaux's own unsold subway spaces let anyone watching, including skeptical media buyers, verify the outcome themselves rather than trust a claimed statistic, since Marina's follower count and the campaign's own reported impressions were independently checkable in real time rather than asserted after the fact. Because the demonstration used space that was otherwise generating zero revenue, the cost of running it was close to the space's opportunity cost rather than a large incremental media spend, making the proof itself disproportionately cheap relative to what it needed to demonstrate. The campaign's own dramatic, human, trackable arc, a nobody becoming genuinely followed, made it inherently newsworthy and shareable on its own terms, generating over 400,000 impressions and interactions with 92,000 unique accounts within a month and winning six Cannes Lions, reach the campaign earned by being a real story rather than reach it had to buy.
值了多少
More than 400,000 impressions in the first week and interactions with 92,000 unique accounts within a month, per JCDecaux's own release; Marina's Instagram grew from 28 followers to over 10,000. Neither source read for this case discloses a brand-signing or media-investment figure, so that claim is not made here.
什么时候会失灵
The mechanism depends on having genuinely unsold or underused inventory available to run the demonstration on at low incremental cost — a company with no spare capacity would have to spend real, allocated resources to run the same proof, changing the economics substantially. It also depends on the demonstration producing a result dramatic or human enough to be independently newsworthy on its own; a duller, less narratively compelling proof of the same inventory's reach might generate accurate but unremarkable numbers that fail to draw the media attention that made this specific campaign self-amplifying. And the case's own honest disclosure, that no brand-signing or media-investment figure was found in the available reporting, is a reminder that a campaign proving reach and winning creative awards is not the same as proving it converted skeptical brands into paying advertisers — that final commercial link remains undocumented here.
后来呢
'Meet Marina Prieto' won six Cannes Lions in 2024, including a Titanium Lion and the Creative B2B Grand Prix — the first Spanish campaign to win that category — and is now cited in OOH sales trainings as a model for proving inventory value by using the inventory itself rather than pitching it.