# Porter's Five Forces Porter's five forces explain how profitable an industry can be from rivalry, the power of buyers and suppliers, and the threats of new entrants and substitutes. **The question.** How much profit can this industry actually earn, and which of the five forces is taking it? Also known as: Also called the Five Forces framework or industry structure analysis. The unit of analysis is the industry, not the firm. ## When to use it - A client wants to enter an industry because current players look profitable, and nobody has asked whether those profits can last. - Strategy work starts from the company's strengths, and industry structure is missing from the room. - A margin slide is being blamed on "competition" in general, and you need to say whether the leak is buyers, suppliers, substitutes, entry, or rivalry. - You need a shared picture of why this industry earns 6 percent and an adjacent one earns 18, before anyone picks a position inside it. ## When to avoid it - The question is how this firm will win inside an industry whose structure you already understand. Generic strategies or the value chain answer that. - The boundary of the industry cannot be agreed. Five Forces on a bag of unrelated products produces a mush of forces that belong to different businesses. - You need a scan of politics, demographics, or technology in the wider environment. PESTLE lists those, and they matter here only when they change a force. - The client wants a scored attractiveness index for a portfolio of units. The nine-box uses that kind of score; Five Forces explains one industry at a time. ## Overview Five Forces explains the profit potential of an industry from five structural pressures: rivalry among incumbents, the power of buyers, the power of suppliers, the threat of new entrants, and the threat of substitutes. Together they say how much of the value created in the industry stays with the firms that compete in it. The decision it supports is whether this is a good industry to be in, and which force is the one to design around. The unit of analysis is the industry, not the firm. A well-run company in a structurally poor industry still has a ceiling on its returns. Draw the boundary from the buyer's alternatives, fill each force with drivers and evidence, and treat government, complements, and technology as things that change a force rather than as extra forces. Position inside the industry is a later question. ## The five forces ### Rivalry among existing competitors How hard incumbents fight, on price or on cost-raising forms of competition such as advertising, capacity, and new products. Rivalry is usually fierce when competitors are numerous or similar in size, growth is slow, products are undifferentiated, fixed costs are high, and exit is hard. Intense rivalry transfers profit to buyers or burns it in extra cost. ### Bargaining power of buyers Whether customers can force price down or demand more for the same price. Buyer power is high when they are concentrated relative to the firms that serve them, the product is a large part of their cost, switching is cheap, and they can make the product themselves. A powerful buyer group captures a slice of the industry's value. ### Bargaining power of suppliers Whether suppliers can raise input prices or squeeze quality and terms. Supplier power is high when they are concentrated, their input is distinctive or costly to switch, and they are not dependent on this industry. A powerful supplier group captures a slice of the value before the industry sees it. ### Threat of new entrants How easily new firms can come in and add capacity. The threat, not only actual entry, caps prices. Barriers include scale, capital, brand, access to distribution, switching costs, and regulation. If likely entrants already compete in adjacent regions or products, the threat is higher than a list of barriers suggests. ### Threat of substitutes Other products or services that meet the same underlying need in a different way. Videoconferencing for travel is the usual teaching case. The threat is high when the price-performance trade-off is attractive and switching is easy. Substitutes put a ceiling on what the industry can charge. ## What it is not - A firm-level SWOT. The unit is the industry. A strong firm in a structurally poor industry can still earn a weak return. - A list of competitors. Named rivals belong under rivalry, and they are one force out of five. - A sixth-force model with government or complements added by default. Put those in only when they change one of the five, or you are no longer running Porter's tool. ## The steps 1. **Set the industry boundary.** Write the product, the buyer, and the geography. A rooftop-unit industry and an HVAC-equipment industry will produce different forces. If two boundaries are plausible, run both and see whether the conclusion moves. 2. **Take each force in turn.** For each force, list the structural drivers that are present, with evidence. Name the buyer groups, the supplier groups, the substitutes, and the plausible entrants. "High rivalry" with no drivers is an opinion. 3. **Judge how profit is split.** Say, in numbers if you can, how much of a typical price goes to suppliers, how much is given to buyers, and how much is burned in rivalry or capped by substitutes and entry. The output is an expected range for industry returns, not a rating of the client. 4. **Watch what would change a force.** Note the trends that would raise or lower a force, such as a distributor merger, a new substitute's cost curve, or a change in licensing. Those are the few outside items worth tracking. 5. **Only then discuss position.** Once the industry's profit potential is on the table, ask where the client can sit so as to be less exposed to the strongest forces. That is a separate choice, and generic strategies or the value chain carry it. ## In practice A $420 million HVAC manufacturer wanted a plant in North American commercial rooftop units, a $6.4 billion market, because several incumbents had just reported EBIT around 15 percent. Four firms held 72 percent of volume. Market growth was about 2 percent. Eight national contractors and three distributors bought 55 percent of units and could move volume on the next bid. Two compressor suppliers accounted for 18 percent of industry cost of goods and had announced a 6 percent price increase. A new plant would cost $90–120 million and take about three years to get onto specifier lists. Variable-refrigerant systems were taking roughly 1.5 share points a year from rooftop units at the high end. The force-by-force write-up put sustainable industry EBIT in the 7–9 percent range, not 15. Buyer power and slow growth explained most of the gap; the 15 percent year followed a hot summer. The recommendation was not to build a me-too plant. If the board still wanted in, it would be through controls and service on the slice of jobs, about 20 percent, where energy codes rather than first cost decide the spec. ## What you leave with - A written industry definition, and a note on any alternative boundary that was tested. - A force-by-force write-up with the drivers and the evidence, not a high/medium/low sticker alone. - An expected range for industry profitability, and which force accounts for most of the gap to the client's hope. - The two or three structural changes that would rewrite the conclusion, with an owner to watch them. - A first implication for whether to enter, stay, or reposition, before any generic-strategy work. ## Failure points ### The industry drawn around the client The boundary is set so that the client leads it, or so that unpleasant substitutes sit outside it. Forces then describe a market that does not exist. Write the boundary from the buyer's alternatives, not from the org chart. ### A checklist of things to improve Each force is turned into an action, such as "reduce buyer power." Some forces cannot be moved by one firm. The tool's first job is to say how much profit the industry has to offer, not to generate twelve initiatives. ### Confusing a substitute with a rival Another firm selling the same product is rivalry. A different product that the buyer can use instead is a substitute. Mixing them double-counts one pressure and hides the other. ### Scoring the client instead of the industry A sentence such as "our brand is a barrier to entry" is a firm claim. The force asks whether entry is hard for a capable outsider, including ones that already have a brand in an adjacent market. ### A one-time slide Structure moves when buyers consolidate, a substitute crosses a cost line, or regulation opens the door. Last year's "attractive industry" is this year's trap, and nobody is assigned to notice. The failures above are usually [Framing](https://usefulconsultingframeworks.com/your-edge/#framing): the wrong problem was chosen before this framework was applied. ## Origin Michael Porter, then at Harvard Business School, published the framework in Harvard Business Review in March–April 1979 as "How Competitive Forces Shape Strategy." The article argued that competition in an industry is more than rivalry among incumbents, and that five forces together set the industry's profit potential: the threat of new entrants, the bargaining power of customers, the bargaining power of suppliers, the threat of substitute products, and the jockeying among current competitors. He developed the argument at book length in Competitive Strategy (Free Press, 1980). A 2008 HBR article, "The Five Competitive Forces That Shape Strategy," restated the framework and answered common misuses, including treating the forces as a checklist of things to improve rather than as a map of how profit is divided. The analysis sits in industrial-organization economics, in the structure–conduct–performance tradition. Complements, such as firms whose products raise the value of the industry's product, are not a sixth force in Porter's original. He later discussed them and argued that they work through the five. The framework is not trademarked or licensed. The 1979 and 2008 articles are copyrighted by Harvard Business School Publishing, and Competitive Strategy is copyrighted by The Free Press. ## Further reading - [How Competitive Forces Shape Strategy](https://hbr.org/1979/03/how-competitive-forces-shape-strategy). Michael E. Porter, Harvard Business Review, March–April 1979. The original article. Paywalled after a short opening, so use a subscription or a library copy. - [The Five Competitive Forces That Shape Strategy](https://hbr.org/2008/01/the-five-competitive-forces-that-shape-strategy). Michael E. Porter, Harvard Business Review, January 2008. The restatement most practitioners now meet, with a section on common mistakes. Paywalled after a preview. ## Related frameworks - [PESTLE and Its Extensions](https://usefulconsultingframeworks.com/frameworks/pestle/): Scans the wider environment. Use PESTLE for regulation, technology, and politics that will later shift a force; use Five Forces for how profit is divided in the industry now. - [Porter's Generic Strategies](https://usefulconsultingframeworks.com/frameworks/porters-generic-strategies/): Chooses a position inside the industry the forces describe. Run Five Forces first, then pick how to compete. - [Porter's Value Chain](https://usefulconsultingframeworks.com/frameworks/value-chain/): Shows where this firm creates the cost position or the difference that a position needs. Use it after you know the industry structure. - [Ohmae's 3C Model](https://usefulconsultingframeworks.com/frameworks/ohmaes-3c/): Looks at customers, the company, and named rivals together. Pick it when the question is a specific competitive triangle, not how much profit the industry can earn. Last updated October 20, 2026.