Ask a promoter which products make money and the answer usually comes from memory, not measurement. The company margin is known to the decimal. The margin of the third-largest SKU, adjusted for the freight it consumes, the credit period its customers take and the changeovers it forces on the plant, is known to nobody.
This is not an accounting gap. It is a strategy gap wearing accounting clothes.
The averaging problem
A blended gross margin is an arithmetic mean of very different businesses that happen to share a factory. Inside a respectable aggregate, it is entirely normal to find products earning far above the average alongside products that, once fully costed, earn nothing at all. The profitable products subsidise the rest — silently, year after year — and because the subsidy never appears as a line item, it is never challenged.
The distortions concentrate in the costs that standard costing spreads thinly across everything: freight and secondary distribution, quality failures, small-batch changeovers, extended credit granted to specific customers, and the working capital each product ties up. Spread evenly, these costs flatter complexity. Measured honestly, they usually reveal that complexity has a small number of very expensive addresses.
Why growth makes it worse
Volume growth deepens the problem it appears to solve. When sales rise, the aggregate improves, the review meeting relaxes, and the cross-subsidy compounds — because growth is rarely distributed evenly across the mix. A business can add revenue for three consecutive years while its true profit pool narrows to fewer products and fewer customers than management would ever guess.
The moment of discovery is usually external: a capacity constraint that forces a choice between products, a price negotiation with a large customer, or a diligence team building product-level profitability from first principles and asking questions the MIS cannot answer.
What honest product economics change
Product-level and customer-level profitability, built on defensible allocations rather than convenient ones, changes three conversations at once. Pricing stops being a market-rate reflex and becomes a decision with a floor under it. Customer negotiations acquire a walk-away number. And capacity allocation — the quiet decision about which orders the plant serves first — starts routing scarce hours toward the products that actually pay for them.
None of this requires punishing the loss-makers. Some deserve repricing, some deserve redesign, some earn their keep strategically and should stay. What no product deserves is to remain unmeasured.
The management question is uncomfortable but clarifying: if the true profit of every product and every major customer were on one page, which decisions of the past year would have gone differently? For most businesses, the honest answer is the business case for building the page.