How Brands Grow

Most marketing budgets reward the already-converted. Byron Sharp's research at the Ehrenberg-Bass Institute proves that is exactly backwards, and in 2025, with attention scarcer and CAC higher than ever, the cost of getting this wrong has never been steeper.

Quick Summary

• Brand growth comes primarily from penetration (more buyers), not deeper loyalty from existing fans.
• The Double Jeopardy Law: bigger brands have more buyers AND those buyers buy slightly more often, size compounds.
• Mental availability is how easily your brand surfaces in a buying moment. Physical availability is how frictionlessly someone can complete the purchase.
• Distinctive brand assets (colours, shapes, sounds, characters) drive recognition faster than rational differentiation.
• 82% of IPA award-winning growth campaigns grew through penetration, not loyalty (IPA Effectiveness Databank).

What It Actually Is

Byron Sharp's 2010 book "How Brands Grow", based on decades of empirical data across hundreds of categories and countries, argues that brand growth follows predictable, law-like patterns that contradict most received marketing wisdom.

The short version: brands grow by reaching more people (penetration), not by extracting more from current buyers. Sharp's findings are not theoretical, they are replicated empirical patterns observed across FMCG, financial services, automotive, and B2B.

Analogy: Think of your brand like a radio signal. Loyalty programs try to turn up the volume for people already listening. Sharp's research says the real lever is extending the broadcast range to reach people who have never tuned in. You cannot compound a signal that only 5% of the category can receive.

Why It Matters (with data)

The evidence base is substantial and has only grown stronger through 2024 and 2025:

• 82% of IPA-winning growth campaigns grew through penetration gains, not loyalty improvements. Only 2% grew primarily through loyalty (IPA Effectiveness Databank, analysed by Ehrenberg-Bass Institute).
• Coca-Cola's top 4% of buyers account for roughly 25% of annual volume. The remaining 75% of revenue comes from infrequent, light buyers, the group most loyalty programs actively ignore (Ehrenberg-Bass Institute, 2023).
• Light buyers outnumber heavy buyers by a ratio of roughly 8 to 1 in most FMCG categories. Targeting only heavy buyers means ignoring your largest revenue pool.
• Even in B2B, LinkedIn's B2B Institute research confirmed that the Double Jeopardy Law holds: larger B2B brands have proportionally more buyers with only modestly higher purchase frequency.
• A multinational studied by Ehrenberg-Bass found that even when brand managers planned to grow through loyalty, penetration still accounted for the majority of their actual growth, with loyalty contributing only a fraction of one additional purchase occasion per buyer per quarter.
• In August 2025, Sharp publicly criticised brand teams for "being obsessed with measuring all these little things that have little to no impact", calling out over-reliance on engagement metrics, attention scores, and hyper-personalisation at the expense of reach and salience.

How It Works: The Sharp Playbook

Step 1: Understand the Double Jeopardy Law

Every large brand has two advantages over smaller rivals:

1. More total buyers
2. Those buyers purchase slightly more often

This is the Double Jeopardy Law. Smaller brands suffer on both dimensions: fewer buyers AND lower purchase frequency. The gap between large and small brands is driven almost entirely by penetration, not loyalty. The strategic implication is direct: if you want to grow, you must acquire more buyers.

Step 2: Build Mental Availability

Mental availability is how easily your brand comes to mind across the full range of buying situations, not just when a consumer is actively in the category.

It is built through:

• Category Entry Points (CEPs): Every distinct occasion, mood, need, or context that could trigger a purchase. A coffee brand's CEPs include morning commute, afternoon slump, first date, working late, and recovering from a run.
• Memory structures: Repeated exposure to consistent brand cues (colours, characters, sounds, taglines) that get stored in long-term memory.
• Broad reach: Infrequent buyers need to encounter your brand enough times to form memory structures. This requires mass reach media, not narrow retargeting.

Step 3: Build Physical Availability

Physical availability means buyers can find and complete a purchase with minimal friction wherever and whenever they decide to buy.

This covers:

• Retail distribution: Are you stocked where your category buyers shop?
• Shelf placement: Eye-level and end-of-aisle placement matter for impulse categories.
• Digital findability: Search ranking, app store position, product listing ads.
• Checkout friction: How many steps from decision to completed purchase?
• Packaging recognition: Does your product stand out in a crowded shelf photo on a mobile screen?

Mental availability without physical availability loses the sale at the final step. Physical availability without mental availability means buyers walk past your product without noticing it exists.

Step 4: Build Distinctive Brand Assets

Sharp's research shows buyers do not carefully evaluate product attributes before purchasing. Most purchases are habitual, triggered by recognition cues, not rational comparison.

This makes distinctiveness more valuable than differentiation.

Distinctive brand assets include:

• Colours (Cadbury purple, Tiffany blue, Hermès orange)
• Shapes (Coca-Cola contour bottle, Apple's bitten apple, Absolut bottle)
• Characters (GEICO gecko, Michelin Man, Compare the Market meerkats)
• Sonic identifiers (Intel chime, McDonald's "ba da ba ba ba", Netflix "ta-dum")
• Taglines with decades of consistency ("Just Do It", "Think Different", "Have a Break")

The goal is to make these assets so consistent and so widely exposed that any single element can trigger your brand without a name or logo being present.

The Brand Growth Loop

Real Company Examples

McDonald's: Consistency at Global Scale

McDonald's is one of the most studied examples of Sharp's principles in practice. The golden arches, red-and-yellow palette, and "I'm Lovin' It" jingle are so deeply embedded in memory structures worldwide that recognition fires before conscious attention engages. A 2024 Interbrand report ranked McDonald's among the top 10 most valuable global brands, with brand value driven substantially by the universality of its distinctive assets across more than 100 countries. McDonald's does not rely on loyalty apps and VIP tiers as its primary growth engine, it invests heavily in reach, ensuring the brand is present in the memory of the widest possible pool of category buyers.

Coca-Cola: Light Buyers Carry the Revenue

Coca-Cola's sales data, cited repeatedly by the Ehrenberg-Bass Institute, illustrates exactly how the Double Jeopardy Law works in practice. Their top-tier superfans (the top 4% of buyers) contribute about 25% of annual sales volume. The remaining 75% of volume comes from light, infrequent buyers, people who drink Coca-Cola a few times a year at most. This means Coca-Cola's growth depends more on keeping the brand salient for occasional buyers than on deepening loyalty among superfans. Their advertising strategy reflects this: broad reach campaigns targeting the whole category, not re-engagement flows for heavy users.

Interbrand Best Global Brands 2025: The Scale Pattern Holds

Interbrand's Best Global Brands 2025 report showed the top three most valuable brands globally as Apple, Microsoft, and Amazon. All three are category-defining mass-reach brands with extraordinary physical availability (online stores, app stores, physical retail, third-party distribution) and multiple distinctive assets. None of the top 25 are niche brands that grew by over-serving a loyal core. The pattern Sharp identified holds at the highest levels of brand value.

Common Mistakes

Mistake 1: Treating loyalty metrics as a growth signal

Net Promoter Score and repeat purchase rate measure the health of your existing base. They do not predict category penetration or brand growth. A brand can have an excellent NPS while its buyer base slowly shrinks through natural churn.

Mistake 2: Retargeting your way to a ceiling

Retargeting and CRM campaigns are efficient at converting people already close to purchasing. However, they recirculate budget within an existing audience. Brands that allocate the majority of media spend to retargeting cap their own reach and shrink the funnel at the top.

Mistake 3: Refreshing brand assets too often

Rebrands and creative refreshes that abandon established distinctive assets destroy accumulated memory structures. When Tropicana replaced its iconic orange-with-straw image in 2009, sales dropped 20% in two months, forcing a reversal. Every time you retire a well-known asset, you reset years of memory-building work.

Mistake 4: Targeting too narrowly

Sharp's research shows that "targeting your best customer" sounds efficient but is actually a constraint on growth. Category buyers are diverse. Narrow targeting means you are not building memory structures in the 70-80% of potential buyers who do not currently fit your ideal profile.

Mistake 5: Confusing brand preference with mental availability

Brand preference (surveys asking "which brand do you prefer?") is a different measure from mental availability (which brand comes to mind first in a buying situation?). Many brands have high preference among small, loyal segments while having low mental availability across the broader category, the worst combination for growth.

The Old Playbook vs Sharp's Evidence

Your 5-Step Implementation Checklist

1. Audit your reach. What share of category buyers encountered your brand last month? If it is below 30-40%, reach is your constraint, not creative quality or message clarity.
2. Map your Category Entry Points. List every occasion, mood, context, and need state that could trigger a purchase in your category. Then assess how many of those CEPs your current creative actually links to your brand.
3. Inventory your distinctive assets. List every visual, sonic, and verbal element buyers reliably associate with you. Run a consistency audit across the last 12 months of creative. Are those same assets showing up in every execution?
4. Add penetration to your dashboard. Track what percentage of category buyers purchased your brand this month, not just how often existing buyers returned.
5. Remove one purchase friction point. Audit your checkout flow, shelf presence, or digital findability. Physical availability improvements compound quietly but consistently.

Key Takeaways

• Growth comes from reaching more people, not from intensifying loyalty among existing buyers.
• The Double Jeopardy Law is a law: small brands cannot win on loyalty alone; they must grow penetration first.
• Mental availability is the breadth of memory cues that fire for your brand, not just unaided awareness.
• Physical availability means zero friction between decision and purchase, in every channel where buyers shop.
• Distinctive assets outperform differentiated attributes because most purchase decisions are habitual, not rational.
• 82% of effective growth campaigns in the IPA database won through penetration, the data is not ambiguous.