What is Mental Availability in Marketing?

The Definition

Mental availability is the probability that a buyer will notice, think of, or consider a brand in a buying situation. The term was developed at the Ehrenberg-Bass Institute — most associated with Professor Byron Sharp's book How Brands Grow — and has been expanded significantly by Professor Jenni Romaniuk, who has spoken about her research on That's What I Call Marketing.

The key insight is deceptively simple: brands grow by being thought of more often, by more people, in more buying situations. This is different from being liked, trusted, or having a deep relationship with customers. A brand with high mental availability simply comes to mind when someone is deciding what to buy — and that is worth an enormous amount.

How Mental Availability is Built

According to Jenni Romaniuk's research, mental availability is built through two things working together: reach and distinctiveness. Reach means getting your advertising in front of as many category buyers as possible — not just your existing customers, but the much larger pool of people who might buy in your category at some point. Distinctiveness means using consistent sensory cues — logos, colours, characters, sounds, even a tone of voice — that reliably trigger brand recognition.

These consistent cues are what Romaniuk calls Distinctive Brand Assets. The value of distinctive assets is in memory: when a buyer encounters a brand's distinctive asset in a purchase situation, it shortcuts the decision. They do not need to consciously think about the brand — the asset triggers it automatically. Karen Nelson-Field's attention research adds a further layer: brands with strong distinctive assets capture more attention in media environments, creating a compounding advantage over time.

The discipline required to build mental availability is ruthless consistency: the same assets, used repeatedly, over years. Most brands undermine their own mental availability by refreshing their creative, changing their distinctive assets, or targeting only their existing customers rather than the broader category.

Mental Availability vs Brand Loyalty

The Ehrenberg-Bass research directly challenges the conventional marketing focus on loyalty. The data shows that most buyers of any brand are light buyers — they purchase infrequently and switch regularly between brands in the category. Heavy, loyal buyers do exist, but they represent a small share of most brands' revenue. More importantly, they are largely already maxed out. The growth opportunity for most brands lies in reaching the light buyers and non-buyers — the people who might consider you but rarely do, or haven't thought of you yet.

This is why Jenni Romaniuk argues that depth of relationship is the wrong goal. Mental availability — being in the consideration set of as many people as possible — is more valuable than loyalty programmes and relationship marketing for most brands in most categories. The brands that grow are easy to think of and easy to buy.

Physical Availability: The Other Half

Mental availability works in tandem with what the Ehrenberg-Bass Institute calls physical availability: how easy it is to actually buy a brand. A brand can have high mental availability — lots of people think of it — but if it is hard to find, out of stock, or unavailable in the channel where buyers are shopping, that mental work is wasted. Romaniuk's research treats both as necessary conditions for growth, not alternatives.

Peter Field's work on share of voice connects to this: brands that maintain a higher share of voice than their current share of market are investing in future mental availability — buying growth that will materialise over time as more buyers encounter the brand and add it to their consideration set.

The Practical Implication for Marketers

If mental availability is the goal, the implications for marketing practice are significant. Targeting strategies that focus exclusively on likely buyers or existing customers are missing most of the potential. Creative strategies that prioritise novelty over consistency are destroying brand assets that took years to build. Measurement frameworks that focus on conversion rates are blind to the slow, cumulative brand effects that drive long-term growth. The mental availability framework does not tell you to stop measuring performance — it tells you that performance metrics only capture part of what marketing does.