--- title: Porter's Five Forces — definition | RGM® Glossary url: https://realgrowthmatters.com/glossary/porters-five-forces/ updated: 2026-06-10 source_html: https://realgrowthmatters.com/glossary/porters-five-forces/ --- # Porter's Five Forces Por·ter's five forc·es/ˈpɔɹtəɹz faɪv ˈfɔɹsɪz/noun Before asking how to win the game, Porter asks the colder question — is this game worth winning? Term : Porter's Five Forces Author : Michael E. Porter, HBS (1979) Forces : Rivalry, entrants, substitutes, buyer power, supplier power Output : Industry attractiveness + strategy levers ## Forms & parts of speech five-forces read · phrase An industry-structure assessment. "The **five-forces read** on that market is brutal — zero switching costs and the suppliers own the channel." ## Definition in plain terms Porter's Five Forces analyzes why some industries stay profitable and others grind everyone down. The forces: COMPETITIVE RIVALRY (the center), THREAT OF NEW ENTRANTS (how easily others join when profits show), THREAT OF SUBSTITUTES (different solutions to the same job — spreadsheets versus your SaaS), BUYER POWER (can customers squeeze you?), and SUPPLIER POWER (can inputs squeeze you? — in digital, often the platforms). Together they set the industry's profit ceiling before any company's execution matters. ## The mechanics The framework's use is two-directional: assess attractiveness (where to compete) and locate the levers (how to reshape your position — raise switching costs against buyer power, build moats against entrants, differentiate against substitutes). The marketing translation is direct: brand is an entrant barrier and a rivalry softener (price wars hurt commodities, not distinctive brands), community and data raise switching costs, and channel dependence is supplier power wearing a logo — the brand whose demand arrives via one platform's auction has a powerful supplier indeed. Porter's later addendum (complements, the internet's effects) extends rather than replaces the logic. ## When it matters Reach for it entering markets (the attractiveness read), at strategy resets (which force is squeezing margin — and which marketing investment loosens it), and when pricing power erodes mysteriously. Its tension with the category-design school is productive: Porter analyzes the structure you're in; category design redraws it — the sophisticated read uses five forces to price how badly a redraw is needed. **Worked example.** A DTC brand's margins shrink despite growth. The five-forces read names the squeeze: supplier power (one ad platform delivers 80% of demand, and its auction inflation IS a supplier raising prices), plus substitutes (the problem increasingly solved by a free habit app). The strategy answers force-by-force: owned channels (email, community) cut platform dependence from 80% to 50% in a year; the brand layer (distinctive assets, word of mouth) softens rivalry's price pressure; a subscription bundle raises switching costs against the substitute. Margin recovers four points — competition hadn't intensified; the STRUCTURE had, and now it answered to design. **Failure modes to watch.** Analyzing the industry once and filing it; reading the forces as fate instead of levers; ignoring platform dependence as supplier power; and fighting structure with tactics when the read says change games. ## Synonyms & antonyms ### Synonyms Porter's Five Forcesfive forces analysis ### Antonyms SWOT (the softer cousin)category design (the redraw school) ## Origin & history Created by Michael E. Porter, the Harvard Business School economist, in his 1979 HBR article 'How Competitive Forces Shape Strategy' and the 1980 book *Competitive Strategy* — importing industrial-organization economics into management and founding modern strategy's structural school. Etymology: [source](https://en.wikipedia.org/wiki/Porter%27s_five_forces_analysis). ## 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=porters%20five%20forces&date=today%205-y) ## Common questions What are Porter's Five Forces? : Rivalry, threat of new entrants, threat of substitutes, buyer power, and supplier power — the structure setting an industry's profitability. Who created the framework? : Michael E. Porter of Harvard Business School — the 1979 HBR article 'How Competitive Forces Shape Strategy.' How do marketers use it? : Brand, community, and owned channels are force-levers — softening rivalry, raising switching costs, and cutting platform supplier power. ## Related tools & calculators - tool[CAC calculator](/tools/cac-calculator/) - tool[LTV-to-CAC ratio](/tools/ltv-to-cac-ratio-calculator/) ## Resources & people to follow - paperPorter (1979) — 'How Competitive Forces Shape Strategy', HBR - book*Competitive Strategy* — Michael Porter - referenceRGM analysis — ad platforms are suppliers; price them that way Curated, non-competitor resources verified per term. ## Related training - module[Growth marketing foundations](/training/growth-marketing-foundations/) ## Disciplines Areas of marketing where porter's five forces is a core concern: [Strategy](/training/growth-marketing-foundations/)[Fundamentals](/training/growth-marketing-foundations/) ## Read next ## Related terms [Category design](/glossary/category-design/)[Brand positioning](/glossary/brand-positioning/)[Christopher Lochhead](/glossary/christopher-lochhead/)[First-party data](/glossary/first-party-data/)[Geoffrey Moore](/glossary/geoffrey-moore/) ## Sources 1. trends[Google Trends — "porters five forces"](https://trends.google.com/trends/explore?q=porters%20five%20forces&date=today%205-y)