--- title: Excess Share of Voice ESOV — RGM® Glossary url: https://realgrowthmatters.com/glossary/excess-share-of-voice-esov/ updated: 2026-06-10 source_html: https://realgrowthmatters.com/glossary/excess-share-of-voice-esov/ --- # Excess Share of Voice (ESOV) E·S·O·Vnoun Out-shout your size — the gap between voice share and market share that decades of evidence link to growth. Term : Excess Share of Voice Formula : SOV − SOM Evidence : Jones (1990), Binet & Field Rule of thumb : ~0.5% share growth per 10 ESOV points ## Forms & parts of speech ESOV · noun Voice beyond your size. "At 20% market share and 28% voice, the brand ran +8 **ESOV** - and the share curve followed, late but faithful." ## Definition in plain terms Excess share of voice (ESOV) is a brand's SHARE OF VOICE minus its share of market — the margin by which it out-advertises (or under-advertises) its own size. The metric carries one of advertising's oldest empirical regularities: brands that sustain positive ESOV tend to grow share, brands running negative ESOV tend to shed it. John Philip Jones documented the SOV-SOM relationship in 1990, and Les Binet and Peter Field's IPA-databank work made the modern rule of thumb famous: roughly half a point of annual share growth per ten points of ESOV, varying by category and brand size. ## The mechanics The mechanism runs through this glossary's brand-science entries: sustained voice above size buys MENTAL AVAILABILITY beyond your current buyer base — reaching the CATEGORY BUYERS who don't yet buy you — and DOUBLE-JEOPARDY dynamics convert presence into penetration over time. The arithmetic needs honest inputs on both sides: share of voice measured across the channels that actually carry category communication (a TV-era metric that modern practice must extend to digital, retail media, and creator spend — comparable measurement is the hard part), and share of market in value terms for like-for-like comparison. The evidence's fine print earns respect: the relationship is correlational-with-mechanism rather than experimental law (big confounds exist — growing brands fund more advertising), effects arrive with lag and compound slowly, creative quality multiplies or squanders the same ESOV (Binet & Field's own work shows emotional brand-building campaigns convert ESOV to growth far more efficiently), and small brands need disproportionate ESOV to defend, let alone grow — the double-jeopardy tax in budget form. The planning uses follow: ESOV as the budget-setting frame (what growth does this spend level even permit?), as the competitive early-warning (a rival's sustained positive ESOV is tomorrow's share fight), and as the board-level translation of 'brand spend' into an evidence-backed growth claim. ## When it matters ESOV matters at budget-setting and defense moments — it converts 'how much should we spend' from taste to benchmark, and 'can we cut brand spend' into a forecastable share risk. It matters most in categories where advertising carries the demand conversation, and least where distribution or product cycles dominate. The discipline is measurement honesty (voice counted across the channels that matter, market in value), patience (the lag is real), creative quality treated as the multiplier it is, and the caveat kept visible — ESOV predicts on average, funds permitting, creative willing. **Worked example.** A mid-size snack brand holds 14% market share and plans 'efficient' media at 9% share of voice - negative-five ESOV, the quiet share-donation setting - while the category leader runs +6. The planning reset uses the evidence as a frame: the board approves voice parity plus four (18% SOV, +4 ESOV) with the Binet-Field math setting expectations - roughly two-tenths of a share point a year, compounding, lag included - and creative investment justified as the multiplier the databank says it is. Measurement counts voice across TV, digital video, and retail media with a consistent method, and the tracker watches mental-availability metrics as the leading indicator. Two years in, share sits at 14.9% - on the curve's schedule, not ahead of it - while the category's other mid-brand, still optimizing to efficiency at negative ESOV, has donated the share the math said it would. The metric never promised magic; it priced the fight honestly. **Failure modes to watch.** Negative ESOV run as 'efficiency' while share quietly donates; voice measured only in channels that flatter; the lag mistaken for failure at quarter three; ESOV claimed as law when creative quality multiplies or squanders it; and small brands budgeting as if the double-jeopardy tax didn't apply to them. ## Synonyms & antonyms ### Synonyms excess share of voiceESOVSOV minus SOM ### Antonyms share of voice (the input)efficiency-only budgeting ## Origin & history The SOV-SOM relationship entered the canon through John Philip Jones's 1990 Harvard Business Review analysis of ad-spend data, and Les Binet and Peter Field's IPA-databank studies made ESOV the budget-planning shorthand of evidence-based brand investment — the rule of thumb every media review now quotes and every caveat section should accompany. Etymology: [source](https://en.wikipedia.org/wiki/Share_of_voice). ## Usage trends Search interest for this term over the last five years: [View interest-over-time on Google Trends →](https://trends.google.com/trends/explore?q=share%20of%20voice&date=today%205-y) ## Common questions What is excess share of voice? : Share of voice minus share of market — the margin by which a brand out-advertises its size, empirically linked to market-share growth since Jones (1990) and quantified by Binet & Field. What is the ESOV rule of thumb? : Roughly half a point of annual share growth per ten points of sustained ESOV — varying by category, brand size, and above all creative quality, with effects arriving on a lag. How should ESOV be used? : As the budget-setting and defense frame — pricing what growth a spend level permits, flagging rivals' voice surges early, and translating brand investment into an evidence-backed share claim. ## Related tools & calculators - tool[AOV calculator](/tools/aov-calculator/) - tool[ROAS calculator](/tools/roas-calculator/) ## Resources & people to follow - reference[Wikipedia — Share of voice](https://en.wikipedia.org/wiki/Share_of_voice) - referenceBinet & Field — IPA databank studies; Jones (1990) ad spend research - referenceRGM analysis — ESOV prices the fight; creative quality decides who wins it Curated, non-competitor resources verified per term. ## Related training - module[Performance marketing](/training/performance-marketing-foundations/) ## Disciplines Areas of marketing where excess share of voice (esov) is a core concern: [Performance marketing](/training/performance-marketing-foundations/)[Growth strategy](/training/growth-marketing-foundations/) ## Read next ## Related terms [Share of voice](/glossary/share-of-voice/)[Mental availability](/glossary/mental-availability/)[Category buyers](/glossary/category-buyers-concept/)[Double jeopardy law](/glossary/double-jeopardy-law/)[Brand lift](/glossary/brand-lift/) ## Sources 1. trends[Google Trends — "share of voice"](https://trends.google.com/trends/explore?q=share%20of%20voice&date=today%205-y)