How to Tell If Your Promotions Actually Work
The Illusion of Successful Promotions
Every brand loves a sales spike, especially at the end of the year when everyone's chasing for any last-minute chance to hit their targets. But not every spike means success. You drop the price, volume goes up, everyone celebrates. Except: margins collapse, loyal buyers stockpile, and after the promo ends, sales fall below baseline, good purchase habits are ruined and instant price gratifications take place.
It's not growth. It's a sugar rush. That's why Promo Elasticity matters. It separates real uplift from illusion. According to a recent study, over 70% of promotions fail to deliver a positive return on investment (ROI) due to poor promo elasticity management.
Understanding Promo Elasticity
Promo Elasticity measures how sensitive shoppers are to price changes. It answers one question: If I discount, how much extra do I sell?
Formula: % change in sales volume ÷ % change in price
Example:
- Regular price: €1.00 → weekly sales = 1,000 units
- Promo price: €0.80 (−20%) → sales = 1,600 units (+60%)
- Elasticity = 60 ÷ 20 = 3.0
This means every 1% discount drove 3% more sales. A strong response. But if the number is below 1, you sold more but lost more. Weak elasticity, poor promo.
The Quality, Not Quantity, of Shopper Response
Elasticity shows the quality of shopper response, not just the quantity.
- High elasticity = promo triggers incremental demand
- Low elasticity = promo shifts purchases in time or cannibalizes other SKUs
In short, it's not about volume, it's about efficiency. A 20% discount that drives a 60% sales lift may seem like a win, but if it's merely pulling forward future demand or stealing sales from other products, it's not true growth.
Powering Promo Elasticity with Footprints AI
Traditional promo analysis looks backward: what happened after the discount. Footprints AI looks forward.
By connecting elasticity to life stages, missions, and behavioral profiles, Footprints AI can predict:
- Which shoppers will respond to which discount
- When and where they'll do it
- How media exposure amplifies promo effect
For example, Footprints AI might reveal that "Young Families" on a "Stock-up" mission respond 2.5× stronger to a 15% cereal discount on Fridays. This allows brands to orchestrate promotions, not just run them, precisely targeting the right audience, at the right moment, on the right channel, with the right offer.
Promo Elasticity transforms promotions from a gamble into a calibrated investment.
The New Rule of Promotions: Chase Responsiveness, Not Volume
Don't chase volume. Chase responsiveness.
Because when you understand elasticity, you don't just run promotions, you orchestrate them. Footprints AI can predict when a discount becomes a decision trigger at the shopper level, helping brands maximize the efficiency and effectiveness of their promotional strategies.
Related Reading
- Closed-Loop Measurement: How Retail Media Proves Sales Impact
- Holdout Groups: Retail Media's Cleanest Incrementality Test
- Retail Media Baseline: The Starting Line Behind Every Retail Media Uplift
- How Audience-Based Buying Defines the Future of Retail Media?
- What Makes a Real Retail Media Network? The 4 Pillars Every RMN Needs
Ready to see how this works in practice?
Footprints AI helps brands and retailers measure what matters. See our customer success stories or get in touch to discuss your retail media strategy.
