The Cost of Seeing Shoppers Without Serving Them
Let's say you buy a couch. Then for the next three weeks, every ad you see is for that same couch.
The brand knew you bought it. The purchase sits in their system, timestamped, confirmed and paid.
The ad engine keeps running the campaign that already worked, because nothing downstream of "we know this" ever got the message to stop.
That's the part nobody's counting when they tally the ROI on an identity investment: The money spent to see a shopper clearly isn't the same line item as what happens next. New Epsilon research found that 96% of companies say AI is improving their personalization, three out of four have increased spend, and only 45% of consumers say they actually feel understood.
Companies keep building. The gap between knowing and using doesn't shrink with it.
Here's the distinction I think we're missing. Recognition is knowing who someone is — the identity resolution, the AI, the unified profile connecting a person across every channel they touch. Response is what happens with that knowledge in the moment it matters. And relevance, the word everyone in this industry is chasing right now, is just the scorecard for whether response showed up.
Recognition plus response equals relevance. Everything else is infrastructure.
Most loyalty and personalization spend right now is buying recognition and calling it relevance. It isn't the same purchase. The same survey found 81% of marketers using identity resolution say it improved effectiveness. Yet 41% only apply that data to half or fewer of their marketing efforts, and 41% admit they aren't using what they have to its full potential.
Not all identity resolution is equal, and the industry knows it, but even the best version still needs somewhere to go. Resolving identity isn't the differentiator it used to be. The differentiator is using it well.
Where It Shows Up on the P&L
Customer acquisition cost (CAC) is up 16% in the last year alone, and over the past decade it's climbed more than 200%, even as brands pour more into the exact technology meant to make acquisition smarter.
The gap isn't evenly distributed. It's worst where the acquisition dollars go: Marketers are confident identifying existing customers 88% of the time, but that drops to 72% for prospects, the audience they're spending most to win.
Ask identity resolution users what trips them up, and the top answer isn't the technology. It's understanding prospects with less information, at a moment when nearly 80% of consumers are trading down and more than 60% would switch for a better offer.
Acquisition was always going to cost more than retention. Not using what you already know about the person you're acquiring is what makes it cost more than it has to.
What "Sustainable" Actually Has to Mean
"Scalable, sustainable growth" is everywhere in this industry. It's on panels, in decks and in every vendor's pitch. It's used constantly, but defined rarely. Here's my attempt: It's a wheel with four spokes, and a brand that's only built recognition is missing at least three.
Efficient acquisition is one spoke — the CAC number. Protected margin through retention is the second — every dollar spent winning back a customer who should've stayed never should have left. Brand equity through earned relevance is the third, built one response at a time and lost the same way. Resilience to switching is the fourth, and matters most now: A customer who feels merely recognized has no reason to stay when someone else makes a better offer.
A brand running on recognition alone is thin on all four at once without realizing it, because recognition feels like the work: Dashboards exist, unified views exist and engagement reporting looks fine. What's missing is the thing that holds a shopper when switching costs approach zero and every inbox is full of brands claiming to know them.
A relationship built on being seen, without ever being served, isn't sustainable. It's just patient if you're lucky.
What Happens Next
The question isn't whether you have identity resolution, AI or a plan to invest more. It's whether what you already know about a shopper ever reaches the moment that could change what they experience. That's not a technology gap — it's a wiring problem.
The signal you already paid for has to reach the decision, not just the dashboard. The same purchase that kept a couch ad running for three weeks could have triggered nothing at all, a delivery update or a better next offer. The information was identical either way. Only one version used it.
Recognition was never the hard part. It's comparatively inexpensive and mostly solved. What's expensive is stopping there.
Remember: You already know the couch sold. The system that knew it is capable of doing something about it. Whether it does is a choice, not a limitation.
About the Author
Heather Campain is the vice president of CPG growth strategy at Epsilon. She has led category management and insights at Mars Wrigley Confectionery, U.S. shopper marketing/retail media and customer-based e-commerce teams at Johnson & Johnson, and strategy and transformation at PepsiCo. Campain was recently named as a 2026 Women of Excellence winner in the Industry Impact category.
