Why brands shouldn’t be trapped in the last-click Illusion
Article 1 of 14 in series: The Great Reach Reset
For years, the marketing industry has been obsessed with the “perfect precision” of the last click. But while we have been busy optimising for the next conversion, we have neglected the very foundation of growth: mass reach.
The empirical research of Byron Sharp and the Ehrenberg-Bass Institute is clear: brands do not grow through hyper-targeting. They grow by building mental availability across the entire category. If you aren’t reaching all buyers, you aren’t growing.
The incrementality trap
The biggest challenge for the CMO is incrementality. Performance marketing has a habit of taking credit for sales that would have happened anyway. If a customer is already aware of your brand, the final click is often the result of weeks or months of “mental priming.”
Without measuring the incremental impact of your branding investments, you are effectively flying blind. But to prove incrementality, you need to look beyond clicks and focus on the only two metrics that truly correlate with long-term market share: reach and frequency. In a recent cross-media measurement analysis, we found that 20% of the audience received more than 60% of the total impressions – not because the media plan intended it, but because reach and frequency were optimised in silos.
MMM: Only as strong as the input
With the resurgence of marketing mix modelling (MMM) as brands try to find the “single source of truth,” many are realising a painful reality: the model is only as good as the data you feed it (or to put it more prosaically: garbage in, garbage out).
If you fuel your MMM with raw “impressions” or “total spend”, the model is guessing. To truly understand which channels are driving growth, you need to input deduplicated, cross-platform reach and frequency. You need to know how many unique people you actually reached across TV and digital channels. Without this, the ROI calculations are an academic exercise, not a strategic reality.
Stop the waste, start the growth
Cross-media measurement is the only way to escape the “last-click illusion.” In an era of fragmented media, the real waste isn’t reaching too many people – it’s hitting the same people 50 times because you lack cross-platform control.
By focusing on total reach, we ensure brands are building the mental structures required for growth tomorrow. By managing frequency, we protect the brand’s health and the consumer’s experience.
It’s time to stop hunting for clicks and start measuring what actually moves the needle. Reach is the engine. Frequency is the fuel. Incrementality is the proof.
This article is 1 of 14 in our series: The Great Reach Reset
About this article series
In a fragmented media landscape, reach is no longer a simple KPI - it is a strategic growth lever. In this article series, AudienceProject explores why advertisers are not failing at reach, but at measuring it properly, and why incremental, deduplicated cross-media reach has become essential to driving penetration, controlling frequency, and unlocking sustainable growth.
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