Most leaders know the Pareto principle: 80% of results come from 20% of causes. The working rule inside customer and product portfolios is sharper and more uncomfortable — around half of an organisation's customers, products or part numbers typically account for less than five percent of the value it adds. And that long tail isn't neutral. It absorbs scheduling slots, technical support, sales attention, billing complexity, inventory and management time far out of proportion to what it returns.
Why you can't see it in your accounts
The reason the tail survives is that standard costing hides it. When overhead is averaged across units, low-volume items look nearly as profitable as high-volume ones — the averaging quietly transfers the true cost of the small, fiddly, non-standard work onto your best products and customers. To see reality you have to allocate cost by the load each item actually places on the business: set-ups, changeovers, expedites, support calls, invoicing exceptions. Do that, and items that looked marginal-but-positive reveal themselves as subsidised.
Three axes, not one
The read that matters isn't revenue alone. Score every customer or product on three axes:
- Contribution — what it genuinely adds once cost-to-serve is honest.
- Complexity — the operational load it places on the business.
- Strategic fit — is it strategic, potentially strategic, or non-strategic to where the business is going?
The target cluster is small contribution × high complexity × non-strategic. That's not a customer list — it's a capacity leak.
Four dispositions, each with its own conversation
- Preserve — the core. Protect it, and be explicit that protecting it is where freed capacity goes.
- Reprice — worth keeping at a price that reflects true cost-to-serve. This is a customer conversation, and many customers accept it when the reasoning is honest.
- Restructure — worth keeping if the way you serve it changes: standard lead times, minimum order quantities, self-service channels. Internal changes first, then the external conversation.
- Exit — a planned, respectful wind-down with a migration window. Not a letter; a managed process.
We have the capacity to actively look after about 60% of this list. Which ones are not in that group?
That question is the forcing function for teams that agree with the analysis and still won't cut. Nobody has to nominate a customer to abandon — they have to name what the business can genuinely afford to do well, and let the remainder fall out of the comparison.
The step almost everyone skips
Freed capacity must be explicitly redirected, or the exercise achieves nothing. Capacity released by exiting the tail doesn't sit in a holding pattern waiting for instructions — it gets silently reabsorbed into general busyness within a quarter. The decision about where the recovered time, machine hours and management attention go is part of the rationalisation itself: name the strategic customers who will now get more, the products that will now ship faster, the improvement work that will now actually happen. Otherwise you've endured the pain of the cut and banked none of the gain.