Evidence · Claim check

Do brands grow through penetration or loyalty?

Supported, with limits

Mostly penetration. Differences in brand size and growth come chiefly from the number of buyers, while purchase frequency varies little across brands and moves with brand size. The data span dozens of categories and markets, but almost all of it comes from one research group, the Ehrenberg-Bass Institute, and support for B2B markets rests on a single book.

The claim

Differences in brand size, and brand growth, come mainly from the number of buyers (penetration), not from purchase frequency or the loyalty of existing customers.

Why it could be true: Purchase frequency is nearly constant across brands and tied to brand size (double jeopardy). Almost all the room for growth therefore lies in penetration, among light buyers and non-buyers.

Verdict by context

Consumer markets: Supported, with limits, moderate certainty. The data are highly diverse (dozens of categories, developed and emerging markets, small and large brands), but the research teams are not: almost all the evidence reviewed here comes from the Ehrenberg-Bass Institute line of work. Certainty is therefore moderate even though the pattern looks law-like, and independent confirmations still need to be reviewed. This is a clear case where the diversity of the data and the independence of the teams point in different directions.
B2B markets: Supported, with limits, low certainty. Support comes only from an Ehrenberg-Bass Institute book based on its own B2B datasets. The direction is plausible given double jeopardy, but its strength has not been measured independently.

The evidence

Role	Finding	Study	Design
Supports	A synthesis of panel analyses in which differences in growth track penetration (chapters 2 to 4). It is a book summarising other work, not a primary measurement.^[1]	Sharp (2010)	Book
Supports	Dirichlet benchmarks show that purchase frequency is tied to brand size.^[2]	Ehrenberg et al. (2004)	Conceptual
Context	The Dirichlet model, the formal basis for the link between penetration and purchase frequency.^[3]	Goodhardt et al. (1984)	Model
Supports	In emerging markets, changes in brand share are driven by penetration.^[4]	Romaniuk et al. (2018)	Observational
Supports	Across 474 US consumer packaged goods categories, penetration dominates the behavioural components of category growth. This concerns categories rather than brands, so it transfers only partly.^[5]	Dunn et al. (2025)	Observational
Sets limits	UK panel data break down growth potential by buyer group, clarifying where penetration gains actually arise.^[6]	Trinh et al. (2023)	Observational
Supports	Dirichlet analyses of German panel data show small brands growing or declining through penetration. This is doctoral research.^[7]	Franke (2020)	PhD research, observational
Supports	B2B brands show growth patterns parallel to those found in consumer markets. The book is not peer reviewed.^[8]	Romaniuk et al. (2021)	Book

What this does not say

It does not address the relative cost of retaining versus acquiring customers, which is a separate claim about costs rather than about where growth comes from.
It does not say loyalty does not exist. It says loyalty is not what sets growing brands apart.

Relevant work not yet reviewed here

Jung, Zhu & Gruca (2016): meta-analysis of the link between penetration and market share across more than 400 categories, including the conditions under which it weakens.
Baldinger, Blair & Echambadi (2002): independent confirmation that brands grow through penetration.

References

Byron Sharp (2010). How Brands Grow: What Marketers Don't Know. Oxford University Press.
Andrew S. C. Ehrenberg, Mark D. Uncles, Gerald J. Goodhardt (2004). Understanding Brand Performance Measures: Using Dirichlet Benchmarks. Journal of Business Research.
Gerald J. Goodhardt, Andrew S. C. Ehrenberg, Christopher Chatfield (1984). The Dirichlet: A Comprehensive Model of Buying Behaviour. Journal of the Royal Statistical Society. Series A (General).
Jenni Romaniuk, John Dawes and Magda Nenycz-Thiel (2018). Modeling Brand Market Share Change in Emerging Markets. International Marketing Review.
Steven Dunn, Magda Nenycz-Thiel, Charles Graham, John Dawes, Nick Danenberg (2025). How Categories Grow: The Behavioural Drivers of Revenue Growth. Journal of Business Research.
Giang Trinh, John Dawes, Byron Sharp (2023). Where Is the Brand Growth Potential? An Examination of Buyer Groups. Marketing Letters.
Katrin Franke (2020). How Small Brands Grow: Dirichlet Analysis of the Small Brand Syndrome. PhD thesis, London South Bank University.
Jenni Romaniuk, John Dawes, Byron Sharp, Arry Tanusondjaja, Magda Nenycz-Thiel (2021). How B2B Brands Grow. Ehrenberg-Bass Institute / LinkedIn B2B Institute.

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