Every strategic commercial relationship is managed twice. Once from the supplier’s side, where the practice is mature and has a name: key account management. And once, in principle, from the buyer’s side, where the practice is supplier relationship management. They are the same work seen from opposite ends of the table. Whether they are matched in seriousness is a separate question, and it is the one this paper is concerned with.

What key account management is

 

KAM is the supplier-side discipline of managing the customer relationships that matter most. It rests on a sound premise: not all accounts are equal, so resource should follow value. The strategic accounts get dedicated owners, account plans built around the customer’s objectives, relationships mapped across the buying organisation rather than routed through a single contact, and measurement framed around retention, growth and share of wallet over the long term.¹

 

None of this is improper. It is good commercial practice, and the best of it creates real value. A capable account team anticipates needs, brings problems forward before they surface, and invests in the relationship ahead of the return. That is precisely the value the contract was written to deliver. The buy side would do well to understand KAM properly rather than treat it as something adversarial, because it is the clearest available model of what disciplined relationship management looks like.

The mirror, and where it cracks

 

SRM is meant to be the buy-side equivalent: the same long-horizon, relationship-led stewardship of the suppliers that matter most. In a mature organisation it is exactly that.

 

In most organisations it is not. Buy-side SRM tends to be retrospective where KAM is forward-looking, periodic where KAM is continuous, and under-resourced where KAM is staffed by senior people whose careers depend on the account. The contract is fixed at signature. The scorecard reports on what has already happened. The relationship is reviewed each quarter. The supplier, meanwhile, is managing the same relationship every week, against a plan that extends years out.²

 

This is the asymmetry that matters, and it is structural rather than moral. Two competent disciplines are applied to the same relationship, but they are rarely matched in maturity, cadence or resourcing. The relationship is therefore steered, over time, by whichever side is steering more deliberately. Usually that is the supplier, because the supplier has built the function to do it.

Where the value goes

 

Margin erosion in the post-signature phase is, in large part, the cumulative result of that asymmetry. It does not require anyone to behave badly. A relationship managed attentively from one side and reviewed occasionally from the other will drift toward the side doing the managing. The drift is seldom visible in the moment, because the operational narrative the buyer works from is, more often than not, the narrative the supplier’s account team is best placed to shape.³

We call the cumulative effect Dynamic Margin Erosion. The purpose of the term is to name something the industry usually describes only after the fact, as a value leak or an execution gap, without identifying the mechanism. The mechanism is asymmetric stewardship of a relationship both sides agreed was strategic.

 

It is worth being precise about what this is not.

It is not an accusation. The honest question is not whether KAM erodes margin but where a relationship tips from joint value creation into one-sided drift, and whether the buyer can see that line being crossed while it is happening. A great deal of erosion is entropy rather than strategy: relationships left to run on goodwill and habit, on both sides. Treating ordinary drift as deliberate extraction is the same error, in reverse, as a supplier assuming every buyer is trying to squeeze them.

 

Nor is the asymmetry a law. A serious strategic-sourcing function, of the kind found in parts of pharmaceuticals, defence and automotive, can match or outweigh the supplier’s account team. Where the buy-side discipline is real, the gap closes. The difficulty is that it is real less often than the org chart implies.

Customer of Choice is not a substitute

 

Buyers sometimes rely on becoming a customer of choice, on the assumption that a well-managed relationship will earn favourable treatment. It is a legitimate strategy and, where reciprocated, an effective one. But it is a hope placed in the supplier’s segmentation, not a capability the buyer controls. An organisation that is not a strategic account to its supplier will not receive that supplier’s best people or attention, and will rarely know what it is missing. Customer of Choice describes an outcome. It is not, on its own, a discipline.⁴

The capability the buy side lacks

 

Strip the argument back and one structural fact remains. The supplier operates a function whose explicit purpose is to manage the relationship’s value over time. The buyer, in most cases, operates a contract, a scorecard and a periodic review. The asymmetry is not a failure of effort or goodwill. It is the absence of a symmetric capability.

 

What closes the gap is not a harder negotiation or a tighter contract. It is a buy-side equivalent of what KAM already does well: a continuous, independent reading of how the relationship is actually performing, close to real time, owned by the buyer rather than inferred from the supplier’s account of things. Until that exists, the quarterly review is, in effect, the supplier’s account plan read back to the buyer, in the supplier’s framing, with the measures the supplier chose to surface.

 

That capability is what Suppeco was built to provide. Not as a replacement for the relationship, but as the missing half of it.

Two disciplines, working together

 

The argument so far points at a gap, not a villain, and the resolution follows the same logic. The answer to asymmetry is not to defeat key account management. It is to match it. A relationship managed well from one side and poorly from the other drifts. A relationship managed well from both holds its shape, and usually creates more value for each. Symmetry is the goal, not advantage.

 

The gap to close first is cadence. KAM is continuous and SRM is periodic, and no amount of additional review fixes that, because the problem is timing rather than effort. By the time the quarterly review sits down, the relationship has already moved. The buy side needs a reading that runs at the tempo of the relationship it is meant to govern, not one that catches up with it four times a year.

 

Cadence alone is not enough. The supplier’s advantage is not only that it looks more often, but that it looks at the right thing. A good account team reads the relationship, not just the numbers: the intent behind a request, the early sign that something has shifted. Behind the number is a narrative, and behind the narrative is a person. A buy-side discipline that reads only the metrics will always trail one that reads the relationship.

 

Closing both gaps is what Suppeco and SuppEQ are for. Suppeco gives the buy side a continuous operational reading of how the relationship is actually performing, so the quarterly review is no longer the only window onto it. SuppEQ reads the layer beneath the numbers, the relational signal a capable account manager works from instinctively, and makes it visible to the buyer in something close to real time. Between them they give the buy side a discipline that operates at the supplier’s cadence and on the supplier’s terrain. The symmetric function the previous section described stops being a description and becomes something an organisation can run.

 

None of this works against the supplier, and that matters. A relationship both sides can see clearly is easier to run well from either end. A buyer who can see value being created is in a position to recognise and reward it, which is how Customer of Choice is earned rather than hoped for. Symmetry does not make the relationship adversarial. It makes it legible, and a legible relationship is the one most likely to deliver what the contract intended. That is what it means for the two disciplines to work together: not one managing while the other reviews, but both stewarding the same relationship, at the same tempo, from their own side of the table.

Notes

 

Key account management concentrates dedicated resource on the minority of customers that generate most of the revenue — the Pareto observation that roughly 80% of revenue typically comes from around 20% of customers — through dedicated owners, multi-year account plans and executive sponsorship. Gartner, “Account Management: CSO Strategy Guide”: https://www.gartner.com/en/sales/topics/account-management-and-growth; ARPEDIO, “What Is Key Account Management? A Practitioner’s Definition” (2024): https://arpedio.com/resources/blog/what-is-key-account-management.

State of Flux, Global SRM Research 2025 (17th edition; 484 procurement and supply-chain professionals across 335 companies): only 6% of organisations demonstrate mature SRM capability, even as suppliers are estimated to deliver more than half of the end-customer experience: https://supplychaindigital.com/news/state-of-flux-suppliers-shape-half-of-customer-experience; report overview: https://stateofflux.co.uk/supplier-management.

World Commerce & Contracting, Closing the Procurement Value Gap (2026, with Ironclad): organisations lose on average around 11% of contract value after signature, rising to 15% or more in complex supplier ecosystems; the commonly cited range is 5–15%, against a best-in-class benchmark below 2%: https://procurementandsupply.com/procurement-contracts-leaking-11-percent-of-value-due-to-enterprise-wide-failures/. The earlier IACCM benchmark was about 9% (2012): https://commitmentmatters.com/2020/09/30/contract-value-leakage-how-do-you-compare/. Separately, studies of savings realisation find that 20–60% of negotiated savings fail to reach the P&L, consistent with value being lost in execution rather than negotiation: https://www.gep.com/podcasts/the-hidden-leakage-in-procurement-savings-and-how-to-fix-it.

State of Flux Global SRM Research: SRM leaders report roughly twice the likelihood of financial benefits of 8% or more, and of “customer of choice” benefits such as preferential innovation and access to a supplier’s best resource (2013): https://srm.stateofflux.co.uk/reports-publications. Yet only 38% of organisations had a strategy in place to improve their standing as a customer of choice (2015) — the benefit is real, but largely unearned: https://www.stateofflux.co.uk/2015-srm-research/report.html.