Most FMCG companies know their margins are under pressure. Fewer can name exactly where the leakage is happening. These five diagnostic signals separate companies that are managing inflation from companies that are absorbing it.
Every CFO in FMCG knows margins are tighter than they were three years ago. Inflation has moved through input costs, packaging, logistics, and energy. Pricing has moved too - but not always at the same rate, not always on the same SKUs, and not always in the same direction as costs.
The result is a portfolio where some products are recovering inflation effectively, some are absorbing it silently, and a handful are actively destroying margin with every unit sold. The aggregate P&L shows the net effect. It does not show which products are driving it.
Carthena Advisory's diagnostic work across FMCG and manufacturing portfolios in West Africa reveals a consistent pattern: the companies that are losing margin fastest are not the ones facing the worst input cost inflation. They are the ones with the least visibility into where leakage is occurring at the SKU level.
These are the five signals that distinguish a portfolio under pressure from a portfolio with a structural margin problem.
Sign 1: Your blended pass-through rate masks a bimodal distribution
The portfolio-level cost pass-through rate is the single most cited metric in inflation-era board presentations. "We recovered 58% of input cost inflation this quarter." The number sounds reasonable. It might even be improving quarter-on-quarter.
The problem is what the blended number hides.
SKU-Level Pass-Through Distribution
The blended rate hides a bimodal reality
Typical FMCG portfolio: 56 SKUs. Blended pass-through: 58%. The distribution tells a different story.
Cost pass-through rate by SKU
Source: Carthena Advisory analysis of representative FMCG portfolio, 2024-2026
Across the portfolios Carthena Advisory has analysed, the typical FMCG company does not have a normally distributed pass-through rate across its SKU base. It has a bimodal distribution: a cluster of SKUs at 80-95% recovery (well-managed, typically the top revenue lines where pricing discipline is highest) and a second cluster at 15-40% recovery (under-managed, often mid-tail SKUs where cost increases were partially absorbed rather than fully passed through).
The blended rate falls somewhere in the middle and tells you nothing about either cluster. A company reporting 58% portfolio recovery might have 30 SKUs at 90% and 20 SKUs at 20%. The 30 are fine. The 20 are bleeding margin at a rate that compounds monthly.
The diagnostic question is not "what is our pass-through rate?" It is "how many SKUs are below the 75% recovery threshold, and what is their combined revenue contribution?" If the answer is more than 15% of your portfolio by revenue, the blended number is misleading the board.
Sign 2: Your promotion ROI is measured in volume, not margin
Sales teams celebrate volume. A 15% discount that generates a 25% volume uplift looks like a win on the sales dashboard. The commercial team reports "strong promotional performance" and requests budget for the next cycle.
The question nobody asks in real time: did the volume uplift compensate for the margin given away?
Promotion Breakeven Analysis
The volume lift most promotions never achieve
At 35% gross margin, every discount depth requires a disproportionate volume response to break even.
Source: Carthena Advisory promotional effectiveness analysis across Nigerian FMCG portfolios, 2024-2026
The breakeven volume lift required to maintain margin at a given discount depth is a function of your gross margin. At 35% gross margin - typical for mid-range FMCG in Nigeria - a 15% discount requires a 75% volume lift just to break even on gross profit. Not to generate incremental margin. Just to hold flat.
Most promotions do not achieve anything close to this. Carthena Advisory's analysis of promotional effectiveness across Nigerian FMCG portfolios shows that the median volume response to a 15% discount is 18-25%. Against a 75% breakeven requirement, that is a net margin loss on every promotional unit sold.
The compounding effect is worse. Loss-making promotions train consumers to wait for discounts, suppress willingness to pay at the regular price point, and create channel inventory distortions that show up as demand volatility in the following period. The promotion didn't just lose margin on the units sold. It eroded the pricing architecture for the SKU.
Three questions that separate margin-aware promotion management from volume-chasing:
First, what is the breakeven volume lift for each discount depth at the current gross margin? This is a mathematical calculation, not a judgment call. If the commercial team does not know this number for every active promotion, the promotion is being run blind.
Second, what was the actual volume response versus the breakeven requirement? If the response was below breakeven, the promotion destroyed margin regardless of how the volume number looked in isolation.
Third, what happened to the regular-price volume in the period following the promotion? If it declined, the promotion cannibalised future demand - meaning the true ROI is worse than the in-period calculation suggests.
Sign 3: Your channel profitability ranking changes when you include credit terms
Most FMCG companies rank their channels by gross margin. Modern Trade at 28%, Distributor A at 34%, Distributor B at 31%, Traditional Trade at 22%. The ranking is stable quarter-on-quarter. The narrative is clear: Distributor A is the most profitable channel.
Then you run the full channel margin waterfall - and the ranking inverts.
Distributor A's 34% gross margin comes with 75-day payment terms. At a cost of capital of 22% (a conservative assumption for Nigerian businesses with any naira-denominated debt), the trade credit financing cost alone is 4.5% of revenue. Add distributor rebates, logistics cost per drop, and returns - and the net channel margin drops to 17%.
Modern Trade's 28% gross margin comes with 30-day terms. Financing cost is 1.8%. Lower rebate structure, consolidated deliveries, minimal returns. Net channel margin: 23%.
The "lowest gross margin" channel is actually the most profitable. The "highest gross margin" channel is quietly financing the distributor's working capital at your expense.
CHANNEL MARGIN WATERFALL
From gross margin to true net channel margin
The diagnostic signal is straightforward: if your channel profitability ranking has never been calculated below the gross margin line, you do not know which channels are making money. The hidden costs - trade credit, logistics per drop, returns, rebates - typically consume 12-20 percentage points between gross and net. The composition of those costs varies enormously between channels, which is why gross margin is a misleading proxy for channel profitability.
Sign 4: You cannot name your bottom 10 SKUs by margin contribution - within 30 seconds
This is the simplest diagnostic. Ask your commercial director: which 10 SKUs in the portfolio have the lowest margin contribution per unit? Not lowest revenue. Not lowest volume. Lowest margin contribution after variable costs.
In most FMCG organisations, the answer takes days to assemble because it requires pulling cost data from finance, pricing data from commercial, volume data from sales, and promotional impact data from trade marketing. By the time the analysis is ready, the inputs have changed.
The inability to name the bottom 10 is not a people problem. It is a systems problem. The data exists in the ERP, the trade spend tracker, the pricing file, and the channel management system. It does not exist in one view, at the SKU level, with margin contribution calculated and ranked.
This is the most expensive systems gap in FMCG commercial operations. The SKUs at the bottom of the margin ranking are the ones absorbing the most inflation, running the most loss-making promotions, and diluting the portfolio average. They are also the SKUs where pricing action (reprice, restructure, or delist) would have the highest margin impact per decision. Every month they remain unidentified is a month of avoidable margin erosion.
The benchmark from Carthena Advisory's work: companies that can answer this question in real time - because they have SKU-level margin visibility in a single system - recover 3-6% more EBITDA than companies that assemble the analysis quarterly.
Sign 5: Your pricing decisions are triggered by competitors, not by your own cost structure
When your competitor raises prices, you raise prices. When they hold, you hold. When they promote, you counter-promote. The pricing calendar is reactive rather than analytical.
This is a margin leakage mechanism that operates at the strategic level rather than the SKU level, but its effects are just as measurable. A competitor-reactive pricing strategy implicitly assumes that your competitor's cost structure, margin targets, and pricing elasticity mirror your own. They almost never do.
Your competitor may have a fundamentally different input cost mix (locally sourced vs imported raw materials), a different channel structure (more direct, less distributor-dependent), or different volume-price elasticity curves across the same product categories. When you mirror their pricing, you are optimising for their economics, not yours.
The alternative is a cost-anchored pricing framework where every pricing decision starts with your own cost recovery position. What is the pass-through rate on this SKU? What is the elasticity-adjusted price headroom? What is the breakeven volume at the proposed price point? These are internal calculations that do not depend on competitive moves.
This does not mean ignoring competitive pricing. It means competitive pricing becomes a check on your cost-anchored recommendation, not the starting point. The analytical sequence matters: calculate the right price from your own economics first, then validate it against competitive positioning, then adjust if necessary. Most companies do this in reverse - and the margin cost of that inversion is 2-4 percentage points of gross margin across the portfolio.
The Common Thread
All five signs share a root cause: insufficient granularity. The company has aggregate data (blended pass-through, total promotional volume, average channel margin, portfolio-level cost trends) but lacks SKU-level visibility into which specific products are driving the aggregate in which direction.
The fix is not a consulting engagement. It is not a six-month data transformation project. It is a commercial operating system that takes the data you already have - SKU master, pricing, cost structure, channel terms, promotional history - and calculates the diagnostic metrics at the product level, in real time, benchmarked against industry standards.
That is what MarginCOS does. One data file. Eight analytical engines. Five minutes from upload to a board-ready diagnostic that names the specific SKUs, channels, and promotions driving your margin leakage - and quantifies the recovery opportunity in your currency.