[TL;DR: Buyers don't deliberate. They use memory shortcuts, snap judgments, and "good enough" thinking. Byron Sharp, Daniel Kahneman, and Rory Sutherland all point to the same uncomfortable truth: winning the customer's memory is more important than winning their comparison spreadsheet.]

Why Most Buyers Don't Think About Your Business (And What to Do About It)

Every business owner secretly believes their customers are careful, rational decision-makers who compare options, weigh up value, and eventually choose the best provider. It's a flattering model. It's also wrong.

The uncomfortable reality, backed by decades of research across consumer psychology, behavioural economics, and marketing science, is that most buyers don't deliberate. They pick what comes to mind. They satisfice rather than optimise. They trust fast, automatic signals more than they trust their own analysis. And by the time they're typing into Google, the decision is often already half-made.

This isn't cynical. It's just how brains work. And once you understand it, it changes almost everything about how you should advertise.

The Hard Truth About How Often Buyers Think About You

Byron Sharp's research at the Ehrenberg-Bass Institute, drawn from 40-plus years of single-source consumer panel data, established something the marketing industry still hasn't fully digested: most buyers are light buyers.

The typical customer in any category buys infrequently. They don't follow your brand. They don't compare you regularly. They're not in-market 90% of the year. Sharp found that roughly 30% of Coca-Cola buyers purchase less than once yearly. For a tradie, a financial adviser, a cleaning business, a scaffolding company, the number who are actively thinking about your category right now is a tiny fraction of the total addressable market.

Sharp's central concept, mental availability, explains what this means for your advertising. Mental availability is not brand awareness in the traditional sense. It's whether your brand comes to mind when a buyer enters the category. Specifically, when they experience what Sharp calls Category Entry Points (CEPs): the moments, triggers, and situations that prompt someone to think "I need a plumber" or "I should get a website quote."

"Mental availability refers to the amount of brain space a brand takes up in your head. Buyers easily think of the brand when buying and recognise it quickly."

If your brand isn't linked to the right CEPs in your buyer's memory, you don't exist when it matters. Not because they've rejected you. Simply because you didn't come to mind.

The implication for most SME advertising is brutal: you are almost certainly spending your budget trying to win people who are already in-market, while neglecting to build the memory structures that would bring you to mind when they enter that market next time.

Why the Decision Is Already Half-Made Before They Click

Daniel Kahneman's research on cognitive systems gives us the mechanism behind Sharp's data. In Thinking Fast and Slow, Kahneman describes two modes of thought: System 1 (fast, automatic, memory-based) and System 2 (slow, deliberate, effortful).

System 2 is the rational comparison shopper we imagine our customers to be. System 1 is who actually makes the call.

System 1 thinking is associative. It works by pattern recognition and familiarity. When something "feels right" or "seems trustworthy," that's usually System 1 applying a heuristic based on past exposure, not a reasoned conclusion. Kahneman calls this the availability heuristic: people judge the likelihood or quality of something based on how easily an example comes to mind.

This is why consistent brand assets matter more than most people realise. Sharp proved it from a penetration perspective. Kahneman explains the psychology: repeated exposure to consistent visual and verbal cues builds fluency, and fluency creates trust. When a buyer sees your ad for the fourth time and it looks and sounds the same as the first three, their System 1 registers "I know this business." That feeling of recognition gets misinterpreted as credibility.

A brand that keeps changing its colours, its tagline, its tone of voice, its imagery, is burning the very memory structures it needs to trigger System 1 favourability. It's not just inconsistent. It's cognitively expensive for the buyer.

Why "Good Enough" Beats "Best" Every Time

Rory Sutherland, Vice Chairman of Ogilvy UK and author of Alchemy, has spent his career proving that humans don't optimise. They satisfice: they find a solution that's "good enough" and stop searching.

The concept comes from Nobel laureate Herbert Simon, but Sutherland applied it ruthlessly to advertising and brand strategy. His insight: people aren't looking for the best option. They're looking for an option that reduces their risk of making a mistake.

"We don't buy brands because we believe they're best. We buy brands because we're confident they're good."

This distinction is not subtle. It changes your entire creative brief. A business trying to convince buyers they're the "best" is fighting a different battle than a business trying to convince buyers they're "safe to trust." The latter is far easier to win and far more aligned with how decisions actually get made.

Sutherland's observation on the London Underground's dot-matrix arrival boards is instructive. The boards didn't make trains faster. They made waiting less uncertain. Waiting seven minutes with a countdown is less frustrating than waiting four minutes not knowing. The psychological experience changed, not the objective reality. And the satisfaction scores improved dramatically.

For an SME advertising on Google, this principle translates directly. Your Google reviews aren't just social proof. They're a satisficing signal. A buyer who sees 4.9/5 from 143 reviews doesn't think "this is definitively the best option." They think "this is good enough to not be a mistake." The search stops.

Sharp's research confirms this from a different angle. Physical availability, including your prominence in search, your review volume, your presence across channels, is what allows a buyer to act on the mental availability you've built. Mental availability without physical availability loses the sale at the last moment.

Where Sharp, Kahneman, and Sutherland Agree

These three frameworks look different on the surface. One is marketing science, one is cognitive psychology, one is behavioural economics. But they converge on a single conclusion with remarkable consistency.

Sharp: build memory structures linked to Category Entry Points through broad reach and consistent distinctive assets.

Kahneman: build System 1 fluency through repetition and familiarity so you "feel right" before the analysis begins.

Sutherland: reduce perceived risk through trust signals so you clear the satisficing threshold and end the search.

Three different disciplines. One job. Get into memory. Stay there. Look safe enough to choose.

Where they differ is instructive too. Sharp is relatively agnostic about the content of advertising, arguing that reach and distinctiveness matter more than messaging. Kahneman's research suggests specific biases, like loss aversion and the halo effect, can be used to sharpen creative. Sutherland is the most contrarian, arguing that appearing expensive, scarce, or slightly unusual can trigger better perceived quality than straightforward rational claims.

The synthesis for an SME: be consistent and broad-reaching enough to build memory (Sharp), be familiar and trusted enough to pass the System 1 filter (Kahneman), and be visibly endorsed by enough other buyers to clear the satisficing bar (Sutherland).

What This Means for Your Business

Apply this practically across three areas:

Sharp's data shows that growing a business means reaching light buyers and non-buyers, not just the in-market few. If you only advertise when someone is actively searching for your service, you're only capturing demand. You're not building the memory structures that create demand in the first place. A Google Ads Search campaign alone is not a brand strategy. It's a demand capture tool. You need both.

Same colour palette. Same logo placement. Same tone of voice. Every touchpoint, across every channel. Kahneman's research on cognitive fluency shows that familiarity breeds trust. Every time you change your brand look "to freshen things up," you erase memory structures you've spent money building. If it's recognisably yours from a distance, keep it.

Your Google review count and rating should be visible on your Google Ads. Your landing page should show social proof before it asks for anything. Use specific, named testimonials with outcomes ("generated 23 qualified leads in our first month"), not generic praise. Sutherland's satisficing principle: the buyer is not asking "are you the best?" They're asking "is it safe to stop searching here?" Make that answer yes as early as possible.

FAQ

If most buyers aren't actively comparing, why does my website even matter?

Your website is a System 2 tool: it's what people use to confirm what they've already largely decided through System 1. If someone lands on your site and something feels off, inconsistent design, slow loading, vague claims, no reviews, the System 1 alarm fires and they leave. The website doesn't create trust from nothing. It either confirms or kills the trust that already existed from earlier exposure. That's why it needs to look and feel consistent with every ad or touchpoint that brought them there. Message match isn't just a conversion tactic. It's a cognitive continuity requirement.

Does Byron Sharp's mental availability research apply to small, local businesses?

Yes, arguably more directly than for large consumer brands. Sharp's Double Jeopardy Law shows that smaller brands have fewer buyers, and those buyers are slightly less loyal. The only path out of that trap is reaching more people in the category, not just serving existing customers better. For a local SME, this means consistent visibility across all the places a potential buyer might encounter your category: Google Search, Google Maps, your review profiles, local directories, and social. Each touchpoint either builds or reinforces a memory structure. The sum of that activity determines how likely you are to come to mind when the Category Entry Point fires.

What's the practical difference between mental availability and brand awareness?

Brand awareness asks: "Have you heard of this brand?" Mental availability asks: "Would this brand come to mind if you needed this service right now?" You can have high awareness and low mental availability if your brand isn't linked to the right purchase triggers. A local roofing company might have good name recognition in a suburb, but if they've never linked themselves to the CEP "I've just noticed a water stain on my ceiling," they won't come to mind when it matters. Building mental availability means repeatedly associating your brand with the specific situations, problems, and triggers that precede a purchase decision, not just promoting your name in general.

Should SMEs worry about brand-building or just focus on direct response ads?

Both, but in the right proportion. Les Binet and Peter Field's IPA Effectiveness research found that the optimal split for most businesses leans toward 60% brand-building (long-term) and 40% direct activation (short-term). Most SMEs do roughly the opposite, spending almost everything on direct response because the attribution is easier to see. The problem: direct response captures the demand that brand-building created. If you stop building the brand, you eventually run out of demand to capture. The right answer isn't to abandon Google Search. It's to add reach channels that build memory while Search captures the result.

Further Reading

• How Brands Grow by Byron Sharp - The empirical case for mental availability, penetration, and distinctive assets
• Thinking Fast and Slow by Daniel Kahneman - The foundational research on System 1 and System 2 thinking
• Alchemy by Rory Sutherland - Why psychological solutions outperform logical ones
• The Long and the Short of It by Binet & Field - Evidence on brand vs activation budget allocation
• Ehrenberg-Bass Institute - The research home for empirical marketing science