Your Best Promotion Is Your Worst Decision
You ran a promotion last quarter. Volume spiked. The team celebrated. The vendor smiled. Everyone moved on.
Nobody asked who actually bought.
And that’s the quiet catastrophe of modern retail promotion. We measure success by the number that moves the most and means the least: sales lift.
Sales lift tells you volume went up. It doesn’t tell you whether a single new customer walked through the door. It doesn’t tell you whether you pulled forward purchases that would have happened next week anyway. It doesn’t tell you whether you just handed a 30% discount to your most loyal, least price-sensitive shoppers—the ones who would have bought at full price. And it definitely doesn’t tell you what happened to margin after the confetti settled.
Promotions aren’t failing because they’re poorly executed. They’re failing because they’re measured by the wrong yardstick.
Without customer-level visibility, you cannot separate incremental demand from discounted demand. Full stop. You’re flying a $200 million promotional budget on instruments that can’t tell the difference between creating value and destroying it. And every vendor across the table from you knows it—because they’re measuring the same promotion differently, and their version makes them look great.
Bain’s research is unambiguous: a 5% improvement in customer retention can increase profits by 25% to 95%. Companies that excel at personalization generate 40% more revenue from those activities. But personalization requires knowing who your customer is at the point of the promotion—and most vendor portals can’t connect a promotion to a customer identity. So you spray discounts across your entire base and call it a strategy.
Look at how the leaders operate differently. Costco’s AVP of Retail Media said it plainly: their objective is to accelerate merchandise sales velocity, not to create a separate profit center. Every promotional dollar is measured against real purchase behavior, trained on member-identified transaction data. That’s why their partners see actual incremental outcomes, not dashboard vanity metrics.
Darko Pavic nailed the shift: retail is moving from device-based thinking to transaction-based thinking. Measure by impressions, and every click looks like success. Measure by transaction and you find out half your “wins” were subsidized losses.
The NRF’s 2026 outlook says it clearly: the year’s focus is knowing who you serve, what matters to them, and how to deliver a journey that meets their needs. That journey starts with promotional honesty—not lift, but contribution. Not volume, but value. Not celebration, but accountability.
You don’t have a promotion problem. You have a measurement problem wearing a promotional costume.
Question: Are your promotions creating new value—or subsidizing old habits?
Pull the last three promotions your team ran. Ask one question: What percentage of units sold went to customers who had never purchased this product before?
If nobody can answer that, your promotional strategy isn’t a strategy. It’s a donation. And your vendors are the grateful recipients.
Tomorrow: You’re growing the wrong customers. And your data is hiding it from you.