The Most Important Math in Marketing: Why the 60/40 Rule Should Change How You Think About OOH

The Most Important Math in Marketing:
Why the 60/40 Rule Should Change How You Think About OOH

By Aubrey Lundgren | Lime Media

There’s a number most marketing teams never talk about, and it may be the most important one in their entire strategy. It’s not their cost per click. It’s not their ROAS. It’s not their conversion rate. It’s the ratio between how much they’re spending on brand building versus performance marketing. And for most brands today, that ratio is dangerously inverted.

The research is unambiguous. The fix is more straightforward than most CMOs expect. And mobile out-of-home advertising sits at the center of the solution.

The 60/40 Rule

More than two decades ago, marketing effectiveness researchers Les Binet and Peter Field began analyzing data from the IPA Effectiveness Databank- one of the most comprehensive repositories of real-world marketing performance data ever assembled. Their conclusion, drawn from hundreds of case studies across industries and markets, became one of the most cited findings in the history of advertising effectiveness: the optimal split between brand building and performance marketing is 60/40.

Sixty percent of marketing investment should go toward brand building- the long-term work of building awareness, emotional connection, and mental availability. Forty percent should go toward performance marketing- the short-term work of converting existing demand into sales.

The logic is straightforward. Brand building creates future demand. Performance marketing harvests current demand. You need both. But you need more of the former than the latter , because without a healthy pipeline of brand-built demand, performance marketing eventually runs out of audience to convert.

The Problem: Most Brands Have It Backwards

Here’s the uncomfortable reality. Most brands today (particularly in the digital era) have completely inverted this ratio. They’re running 80% performance and 20% brand, or worse. The dashboards look fine. The ROAS numbers are solid. The cost per acquisition is within range.

Until it isn’t.

Every performance-first brand eventually hits a ceiling. Paid search audiences get saturated. Retargeting pools shrink. Cost per click climbs. Conversion rates plateau. And the instinct almost universally is to optimize harder within the performance channels rather than recognize what’s actually happening: the brand has starved its own future demand by underinvesting in the top of the funnel for too long.

B2B brands are particularly vulnerable to this trap, often running 80/20 performance-to-brand ratios while wondering why their pipeline is getting harder and more expensive to fill. The answer isn’t in the performance channels. It’s in the mix.

Where Mobile OOH Fits

This is where the conversation gets interesting for media planners and CMOs thinking about how to rebalance their mix.

LED billboard trucks are one of the most efficient brand-building tools available at scale. A Lime Media LED billboard truck campaign running across 50+ DMAs builds real-world share of voice: physically, visibly, and in the markets where a brand’s audience actually lives, works, and makes purchasing decisions. And the academic evidence is clear on what happens next: when a brand’s share of voice exceeds its share of market, market share grows. When it falls short, the brand shrinks. That’s not a theory, it’s two decades of effectiveness data.

But what makes modern mobile OOH uniquely valuable in the context of the 60/40 debate is that it doesn’t force brands to choose between brand and performance. A well-designed LED billboard truck campaign does both simultaneously. It builds top-of-funnel awareness at scale while delivering measurable performance outcomes: foot traffic lift, web traffic correlation, device ID passback for digital retargeting, and sales attribution that connects physical presence to real business results.

In other words, mobile OOH doesn’t just help brands rebalance their mix toward brand building. It does it without sacrificing the performance accountability that modern marketing demands.

The Proof Is Already There

The brands that figured this out early have a meaningful head start. Saatva,  the luxury mattress brand that launched as a pure-play, search-only DTC company in 2010, hit the performance ceiling by 2017. Adding OOH to the mix didn’t just rebalance their ratio. It unlocked growth that performance channels alone couldn’t deliver. Measured correctly, through in-store visitation, organic and paid search lift, and brand-direct traffic, OOH turned out to be their highest performing channel. Today Saatva is a $100M+ omnichannel marketer.

That’s not a coincidence. That’s what happens when a brand stops starving its brand-building investment and starts feeding the full funnel.

What This Means for Your Media Plan

The 60/40 rule isn’t a rigid formula, it’s a framework for thinking about where marketing investment creates the most long-term value. For brands currently running heavy on performance and light on brand, the question isn’t whether to rebalance. The data says they should. The question is how to do it in a way that doesn’t sacrifice short-term accountability.

Mobile OOH, planned with audience intelligence, activated with precision, and measured with the same rigor as digital,  is the most practical answer to that question available in the market today. It builds the brand. It moves the needle on performance metrics. And it does both in the real world, where no algorithm can skip it, no ad blocker can hide it, and no cookie deprecation can erode it.

The math has always been 60/40. The tools to execute it have never been better.

To learn more about Lime Media’s LED billboard truck program and measurement capabilities, visit lime-media.com/services/led-billboard-trucks/

To learn more about Lime Media’s mobile OOH and experiential capabilities, visit lime-media.com

About Lime Media
Founded in 2005, Lime Media is a leading mobile experiential marketing company delivering turnkey, high-impact brand campaigns nationwide. With the industry’s largest experiential fleet- 250+ assets, including 80+ owned and operated LED billboard trucks- Lime offers unmatched scale, mobility, and visibility.

Backed by real-time data, verified measurement, and in-house production and logistics expertise, Lime transforms street-level engagement into accountable, results-driven performance for the world’s leading brands and agencies. https://lime-media.com/