Promo ROI Fundamentals
Master the Net Incremental Profit Bridge to separate value-creating from value-destroying promotions
In an illustrative CPG promotional portfolio, roughly one in five events destroy value. The volume looked great, but the profit came in negative.
Consider a worked‑example FMCG promotional portfolio. The retailer loved nearly all of its events. Volume spiked, and the sales teams hit their sell‑in targets. But when the post‑event analysis landed, around 21% of all promotions came in at negative ROI. They cost the business more than they created. The root cause was almost always the same: the volume looked incremental, but most of it was subsidized baseline, shoppers who would have bought at full price anyway. The same pattern shows up across the wider market. McKinsey, drawing on Nielsen data, finds around 59 percent of trade promotions lose money, and 72 percent in the US. The two numbers count different things, the 21% here is this worked example's outright value‑destroyers and the industry figure is money‑losing promotions across the market, but both say the same thing about how much promotional money underdelivers.
Illustrative distribution of promotional events by ROI (worked example). The red bars on the left are promotions that lost money. Roughly one in five CPG promotions destroys value.
The Net Incremental Profit Bridge
Promotion ROI measures net incremental profit, not revenue divided by spend: gross incremental volume minus cannibalization and forward-buy, multiplied by gross profit per unit at the promoted price, minus the fully-loaded promo investment (which carries the subsidized-base give-away), all divided by the trade money at risk. This waterfall reveals how apparent volume success becomes real profit destruction when subsidization and post-promo dips are properly accounted for.
Promo ROI = (Incremental Margin - Margin Dilution - Dip Loss) / (Margin Dilution + Dip Loss)In an illustrative promo-portfolio scorecard (worked example), around 21% of events come in at negative ROI. They consume real trade spend while destroying value. The Net Incremental Profit Bridge is the tool that separates value-creating from value-destroying promotions.
What you'll take away
Promotion ROI measures net incremental profit, not revenue over spend. The Net Incremental Profit Bridge strips cannibalization and forward‑buy out of the headline volume, then charges the subsidized‑base give‑away and the post‑promo dip against the margin, before crediting a single dollar.
Subsidized base, the discount handed to loyal shoppers who would have bought anyway, is the biggest hidden cost on most deep TPRs, routinely 2 to 4 times the margin the incremental units earn.
The Promo Performance Grid scores an event on ROI and genuine incrementality together, so volume uplift on its own never makes a promotion a win.
Incrementality beats depth, and every trade dollar carries an opportunity cost: the same money left in a 1% list‑price move flows to about +11.1% operating profit, the hurdle each event should clear.
Master these trade promotion concepts before exploring the simulator
17 concepts- Purpose
- See how discount depth, volume uplift, and incrementality combine to determine whether a promotion creates real profit or just rents short-term volume.
- How to use
- Start with the default depth, then push incrementality up and down while holding everything else. Compare a shallow-with-high-uplift pattern to a deep-with-moderate-uplift pattern on the ROI waterfall.
- What to watch
- Net promo profit and the incrementality line. Incrementality is the strongest lever, but it is the share-of-TOTAL-volume figure (not the slider) that the grid scores: the BEST band needs it at 50 percent or more, reachable only at high uplift (from about 2.3x with the incrementality slider near its top). Post-promo dip can reverse any headline gain once the event ends.
Simulator
How deep the price cut goes during the promotion. Deeper discounts drive more volume but cost more margin. Promo price: $3.74
How much volume increases during the promotion vs. normal baseline sales. An uplift of 2.0x means double the normal volume.
Share of the UPLIFT volume (above baseline) that is genuinely new demand. The baseline volume itself is always treated as subsidized. The Performance Grid threshold uses share of TOTAL promo volume. At 40.0% of uplift x 2.0x uplift, that works out to 20.0% of total volume incremental.
How many weeks the promotion runs. Longer promotions risk training shoppers to only buy on deal.
The percentage volume drops below normal after the promotion ends, as shoppers who stocked up stay away.
How many weeks the post-promotion volume dip lasts before sales return to baseline.
20.0% of total promo volume (BEST threshold: 50% or more)
80.0% of total promo volume
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Salty Snacks Promo ROI: The Net Incremental Profit Bridge
Your brand manager ran a 20% temporary price reduction (TPR) on the flagship Sea Salt sharing bag of crisps (RSP $4.99, COGS $2.10, normal weekly volume 10,000 units) for two weeks. Total promoted volume was 28,000 units. Trade spend for the event was $18,000 including retailer margin support and in-store activation. Post-event analysis shows a 12% dip below baseline for one week after the promotion ended. Build the Net Incremental Profit Bridge and assess whether this event belongs in the BEST, GOOD, REVIEW, or STOP quadrant.
According to the Net Incremental Profit Bridge, which formula correctly expresses the net incremental profit of a promotion?
Whether the Event Paid Is Only Half the Question
You now know how to build the Net Incremental Profit Bridge and classify an event on the Promo Performance Grid. You can trace the path from headline promoted volume through subsidized base, cannibalization, and the post-promo dip to arrive at net incremental profit. You also understand why the failure of more than half of promotions is built in rather than caused by poor execution. The +11.1% operating profit leverage of a 1% price move from Pricing Lesson 2 is the opportunity-cost hurdle every trade dollar must clear.
But the bridge answers only one question: did this event create or destroy value? It does not tell you whythe incremental volume appeared or where it came from. A +25% ROI event built on category expansion is strategically different from a +25% ROI event built on cannibalizing your own portfolio or pulling next quarter's demand forward through stockpiling. Two events with identical bridge outputs can call for opposite decisions, because one added new demand to the category while the other only moved volume you already had.
Source of Volume decomposition answers the why. It splits every unit of incremental volume into one of six sources: Category Expansion (mutual growth with the retailer), Competitor Switching (brand-level share gain), Retailer Switching (channel-level share gain), Forward Buying (stockpiling, pulled from future periods), Internal Cannibalization (stolen from sibling SKUs), and Subsidized Base(loyal buyers who would have bought anyway). Each source has different implications for your P&L and the retailer's, and it determines whether the next event should be scaled, restructured, or stopped.
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