Ask most marketers what great marketing looks like and they will describe a campaign. The ad everyone shared, the launch that owned the feed for a day, the clever line people repeated. It is fun to make and easy to applaud, and it is rarely the reason a brand grows.

The brands that grow are usually the ones a buyer thinks of first, at the moment they are finally ready to buy. That quality has a name: mental availability in marketing. It is the single idea that reframes what your marketing is actually for, and it is the difference between work that looks busy and work that compounds. This article explains what mental availability is, why it matters more than the cleverest campaign, and how to start building it this week.

What is mental availability?

Mental availability is the degree to which your brand comes to mind, easily and quickly, in a buying situation. The term comes from Professor Byron Sharp and the Ehrenberg-Bass Institute, whose research into how brands actually grow has reshaped modern marketing thinking.

The logic is simple. When a buyer enters the market, they do not run a neutral, exhaustive comparison of every option. They go with what comes to mind. The brands that are easy to remember get considered. The brands that are hard to remember do not, no matter how good they are. Marketing's core job, then, is not to be the cleverest. It is to be the most easily recalled when it counts.

This is why "best product" so often loses to "best remembered." A superior product that no one thinks of at the deciding moment never makes the shortlist.

The 95-5 rule: most buyers are not ready yet

Mental availability matters so much because of a finding that reframes everything: at any given time, only a small share of your market is actually ready to buy.

Professor John Dawes at the Ehrenberg-Bass Institute, working with LinkedIn's B2B Institute, found that in most categories only about 5% of business buyers are in the market in any given quarter. The other 95% are not buying right now. This is known as the 95-5 rule.

It has two consequences for how you market.

First, if your marketing only speaks to people ready to buy today, you are aiming at roughly 5% of your market. That is why "always be closing" messaging plateaus. You eventually exhaust the small group who were ready.

Second, the 95% are not wasted attention. They are future buyers. The brand that reaches them now, and is still remembered when their situation changes, wins the sale later without a fight. Building mental availability in that 95% is the long game that makes the short game easier.

Why memory beats persuasion

It helps to see the 95-5 rule and mental availability in one concrete story.

Picture a finance leader who will eventually need a new payroll platform. Today they are not looking. Eighteen months from now, their headcount doubles and the old system breaks. Now they need a new platform quickly.

In that moment, they do not calmly evaluate every provider from scratch. They shortlist the two or three names they already recognise and trust, then research those. The shortlist was built during the months they were not looking, by whichever brands stayed in their memory.

If your brand built mental availability during that quiet stretch, you are on the shortlist. If you only appeared with a "book a demo" ad the week they started searching, you are competing against brands that were already in their head. The sale was half decided before the buyer ever started buying.

That is the practical power of memory. You cannot persuade a buyer who never thinks of you.

Brand building vs sales activation: the 60/40 split

If memory is built in the 95% and sales are closed in the 5%, how should you split your effort between the two? This is the question of brand building vs sales activation.

Brand building reaches future buyers and creates memory. It works slowly and compounds. Sales activation reaches in-market buyers now and triggers an immediate response. It works fast and fades fast.

Les Binet and Peter Field, analysing the IPA databank of hundreds of campaigns, found that the most effective long-term split was roughly 60% of budget into brand building and 40% into sales activation. Most struggling teams have it reversed, because activation shows a result this week and brand building does not. The slow bleed is rarely noticed until the "efficient" activation channels quietly get more expensive, because there is less and less fresh demand for them to capture.

The exact ratio varies by category and stage, but the principle holds: starve brand building, and over time everything else costs more.

How to build mental availability this week

You do not need a rebrand to start. You need three moves.

1. Audit your split. Sort last quarter's marketing into two piles: "buy now" activation (promotions, demo ads, sales emails) and brand building (consistent messaging, useful content, reach to people not ready yet). If almost everything sits in the first pile, you have found your gap. You are marketing only to the 5%.

2. Find your category entry points. Write down the real situations that push someone to start buying in your category, for example "we just doubled headcount" or "we failed an audit." These trigger moments are when you want to be remembered, so your brand building should attach to them.

3. Be relentlessly consistent. Mental availability is built by repetition, not novelty. Choose one message, one visual style, and one point of view, and show up with them everywhere, for longer than feels comfortable. Consistency is what turns spend into memory.

Do those three and you are already thinking like a strategist rather than a campaign factory. You will also have the language to defend a brand budget the next time someone asks what it delivered this week. The honest answer: it is building the memory that wins next quarter's buyers.

Ready to build marketing that compounds?

Great marketing is not the cleverest campaign in the room. It is being the brand your buyers remember at the moment they are finally ready, and that is what mental availability, the 95-5 rule, and the right brand-to-activation balance are really about.

If you want the full framework, the first module of B2B Marketing Fundamentals is free, and it walks through building strategy from the ground up. You can also get a strategy edition like this in your inbox each week by subscribing to the FP Collectiv newsletter.