Performance marketing can't buy what memory already owns

Purchase decisions start long before a search, they start with a memory.

One of the hardest and most important arguments in enterprise B2B marketing is making the case for brand investment when the pressure to show short-term performance is constant. It's an argument I saw play out in every planning cycle, and one I still see now with clients. The instinct is understandable because performance metrics are tangible, near-term results. Brand building requires patience.But there's a false sense of security in pouring budget into performance while your brand quietly fades from buyers' minds.

If you aren't top-of-mind in the moments a customer enters the market to purchase, you've already lost.

What is mental availability?

Byron Sharp and Jenni Romaniuk at the Ehrenberg-Bass Institute have a specific term for the asset that determines whether your brand gets remembered when it counts: Mental availability. It isn't awareness or preference. It isn't even loyalty. It's the probability that your brand comes to mind in a buying situation — measured against every other brand competing for the same recall.

Mental availability is the closest thing marketing science has to a leading indicator of growth. Brands with higher mental availability capture more of the market, more consistently, over longer periods of time. Not because they run better campaigns in the moment, but because they've built something durable in memory that keeps working when the campaigns stop.

Performance marketing can't build this. It can capture demand that already exists — the 5% of buyers who are in market right now, actively searching, comparing, ready to talk to sales. It's a real and important job, and I've built entire enablement functions around it. But performance is a harvest, not a seed. If nothing has been planted in memory long before the buying moment, there's nothing to harvest.

The 95% problem

The Ehrenberg-Bass Institute calls this the 95-5 Rule. At any given moment, roughly 95% of your potential buyers aren't ready to purchase. They're not searching, comparing or filling out lead-gen forms. They're doing their jobs, living their lives, quietly forming impressions of the brands around them without ever calling it a purchase decision.When the moment does come, the brands that get remembered are the brands that get bought.

Harvard Business Review has published research suggesting that up to 90% of buyers ultimately select a vendor from the shortlist they had in mind on day one, before any research or evaluation began.

The brands that win in memory long before the buying moment win in the market when the buying moment arrives. Performance marketing wins the last mile. Mental availability wins the previous 95 miles.

Why brands skip this and pay for it later

Building mental availability is slow, compounding work. It doesn't show up on a quarterly dashboard or produce an obvious ROI in the next 30 days. That's why so many marketing organizations underinvest in it and why so many CFOs reallocate brand budget toward performance line items with faster feedback loops.

The cost of that reallocation isn't visible for a while. Performance metrics stay strong. Pipeline holds up. Then somewhere around 18 to 24 months later, CAC starts climbing, deals get harder to close, and the shortlist your brand used to appear on no longer includes you. By the time the problem is measurable, the memory is gone and rebuilding it takes years, not quarters. Brands that grow build mental availability first, and treat performance as the mechanism that harvests it, not replaces it.

Where to start

If your marketing is over-indexed on the 5% in market and under-indexed on the 95% who aren't, the shift starts with a different question:

What do you want to be remembered for, and in which specific moments?

Mental availability isn't built by being everywhere. It's built by being present, consistent, and distinctive in the situations that actually trigger buying in your category.

That's where Category Entry Points come in. I'll go deeper on the mechanics of CEPs and how to identify the specific buying moments your brand should own in another post.

If every buyer in your category had to name their top three brands right now, without looking anything up, would yours be one of them?

Research references: Sharp, B. (2010). How Brands Grow. Oxford University Press / Ehrenberg-Bass Institute. Romaniuk, J. & Sharp, B. (2016). How Brands Grow: Part 2. Oxford University Press / Ehrenberg-Bass Institute. Dawes, J. (2021). Advertising Effectiveness and the 95-5 Rule. Ehrenberg-Bass Institute / LinkedIn B2B Institute.

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