Glossary
Penetration
Also known as · Marktdurchdringung, Käuferreichweite
Penetration is the share of category buyers who bought a brand at least once in a given period — the main driver of brand growth.
Penetration is the share of all category buyers who purchased a brand at least once within a defined period. It is the single metric most closely tied to market share, and the one that moves when brands grow.
Why Penetration matters
Growth comes overwhelmingly from more people buying a brand, not from existing buyers buying more. When brands grow, penetration rises sharply while purchase frequency rises only slightly — a pattern so consistent it holds across categories, countries and decades.
Penetration in practice
- Target the category, not a niche. Most of a brand’s buyers are light buyers who purchase rarely.
- Reach beats frequency. Campaigns aimed at heavy users largely talk to people who would have bought anyway.
- Loyalty follows penetration. It is a consequence of size, not a route to it.
This is why retention programmes rarely produce growth on their own: they work on the smaller half of the equation.
Source · Ehrenberg-Bass Institute
Related terms
Double Jeopardy
Double Jeopardy is the empirical law that smaller brands suffer twice: they have fewer buyers, and those buyers are slightly less loyal.
Mental Availability
Mental Availability is the probability that a brand comes to mind in a buying situation — how easily and how often it is noticed, recognised and thought of.
Physical Availability
Physical Availability is how easy a brand is to find and to buy — across places, times and occasions.