Figure 11 Sept 2026From “Long customer relationships can be low-profit”

The relationship-profitability card

Treat customer longevity as one input. Release a profitability claim only after the economic object and its inputs are visible.

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Figure 1The relationship-profitability card

Review field	Required input	Permitted interpretation	Stop signal
Relationship clock	Duration rule and starting event	“Longevity is measured on this clock.”	A longer relationship is assumed to be better.
Revenue trajectory	Period revenue and purchase pattern	“Revenue follows this path.”	Revenue is used as a profit proxy without qualification.
Cost and price	Service cost, discounts, terms, and realized price	“The cost and price boundary is explicit.”	Cost-to-serve and price changes are omitted.
Margin boundary	Contribution or profit definition	“Profitability means this measure.”	A lifetime-value label hides the calculation.
Evidence quality	Measured, allocated, or estimated inputs	“The result carries this measurement uncertainty.”	Unspecified allocations are treated as facts.
Investment decision	Retain, serve, develop, or review	“This action follows this economic question.”	The segment is ranked without a decision rule.

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Source: Author's decision framework grounded in Reinartz and Kumar (2000) and Mulhern (1999). The fields and prompts are synthetic; no customer data or profitability score is supplied.

PNG4:3, 1600 × 1200, with the title, the source line and the attribution set in the image isoglu-2026-long-customer-relationships-can-be-low-profit-fig02.png

Source and evidence

Each line names a claim related to this exhibit, its source, and how it was checked.

A RKU00-C1 Four expectations, tested one by one: whether "there exists a strong positive customer lifetime-profitability relationship", whether "profits increase over time", whether "the costs of serving long-life customers are less", and whether "long-life customers pay higher prices"Reinartz & Kumar. (2000)
A RKU00-C2 The headline result, in the authors' words: "The empirical findings observed in this study challenge all the expectations derived from the literature", and "Long-life customers are not necessarily profitable customers"Reinartz & Kumar. (2000)
A RKU00-C3 The article evaluates the marketing assumption that long-life customers should always receive disproportionate attention against evidence from a noncontractual setting: "it is not clear whether some of the findings observed in a contractual setting hold good in noncontractual scenarios", so "the main objective of this study is a rigorous and differentiated empirical analysis of the lifetime-profitability relationship in a noncontractual context"Reinartz & Kumar. (2000)
A MUL99-C1 The paper is METHOD, not an empirical finding, in its own words: "This paper provides a conceptual and methodological foundation for measuring customer profitability" by extending customer-lifetime-value approaches to broader target-marketing applications.Mulhern. (1999)
A MUL99-C2 Concentration is analysed as a distribution, not asserted as a ratio: "a sharply descending curve for the ordering of customer profit" corresponds to a skewed frequency distribution, and the Lorenz curve's shortcoming is that "it cannot portray percentiles of customers who represent a financial loss to a firm"Mulhern. (1999)
A MUL99-C3 The paper combines a business-to-business customer-profitability analysis with propositions about determinants of profitability and a future research agenda, in the abstract's own words: "An empirical analysis involving the profitability of customers in a business-to-business marketing context is described, along with research propositions for future work on the determinants of customer profitability"Mulhern. (1999)

Grades: A, verified against the printed page of the primary source · B, primary source, text layer only · C, authoritative secondary · D, reported.

From the essay

Growth that compounds

Long customer relationships can be low-profit

Longevity is a time variable, not proof of profit: review revenue, service cost, price, margin, measurement quality, and investment together.

1 Sept 2026

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APA 7

Isoglu, S. (2026). The relationship-profitability card [Figure]. isoglu.com. https://isoglu.com/insights/exhibits/isoglu-2026-long-customer-relationships-can-be-low-profit-fig02/

BibTeX

@misc{isoglu-2026-long-customer-relationships-can-be-low-profit-fig02,
  author = {Isoglu, Sinan},
  title = {{The relationship-profitability card}},
  year = {2026},
  howpublished = {Figure 1, isoglu.com},
  url = {https://isoglu.com/insights/exhibits/isoglu-2026-long-customer-relationships-can-be-low-profit-fig02/},
  note = {From the essay {Long customer relationships can be low-profit}}
}

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<figure>
  <a href="https://isoglu.com/insights/exhibits/isoglu-2026-long-customer-relationships-can-be-low-profit-fig02/">
    <img src="https://isoglu.com/social/isoglu-2026-long-customer-relationships-can-be-low-profit-fig02.png" alt="Figure 1: The relationship-profitability card" width="3200" height="2400">
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  <figcaption>Figure 1: The relationship-profitability card. Source: Author&#39;s decision framework grounded in Reinartz and Kumar (2000) and Mulhern (1999). The fields and prompts are synthetic; no customer data or profitability score is supplied. <a href="https://isoglu.com/insights/exhibits/isoglu-2026-long-customer-relationships-can-be-low-profit-fig02/">View exhibit</a>.</figcaption>
</figure>