What it means
When a manager says "let's run a Porter analysis", they usually mean the five forces framework. It asks how strong five pressures are in an industry: the threat of new entrants, the bargaining power of suppliers, the bargaining power of buyers, the threat of substitute products, and the intensity of rivalry among existing competitors.
The stronger these forces, the harder it is for companies in the industry to keep high profits. Porter's work also includes the value chain, which breaks a business into the activities it performs, from buying materials and making products to marketing and service.
The idea is that competitive advantage comes from doing those activities at lower cost or in a more valuable way than rivals. Finance teams use it to find where costs and margins are actually created.
A third idea is the set of generic strategies. A company can compete as the lowest-cost producer, by differentiating its product so customers pay more, or by focusing on a narrow niche using either approach.
Porter warned about being "stuck in the middle", meaning a company that tries to do everything and ends up with neither a cost nor a quality edge. For finance professionals, the frameworks give a structure for discussing why margins differ between industries and between firms.
A business in an industry with weak buyers and few substitutes can sustain higher returns on capital, while one in a crowded industry with powerful customers will struggle. This feeds directly into forecasts, valuations and investment decisions.
The frameworks are not formulas, and they do not produce a number. They guide judgement, and two analysts may reach different conclusions about the same industry.
Critics also note that they were designed for stable industries and can be slow to capture fast-changing markets and digital platforms. The best practice is to treat a Porter analysis as a starting point for questions.
Which force is strongest, how might it change, and what would that do to our pricing and costs? The answers can then be tested in a financial model.
In practice
Real-world examples.
Example
A private equity analyst assesses a company that supplies parts to two large car makers. Using the five forces, she notes that the buyers are powerful because there are only two of them, so she assumes lower margins in her valuation. The lower margin reduces the value she places on the business by several million dollars.
Example
A retailer maps its value chain and finds that distribution costs are much higher than rivals'. It renegotiates contracts with carriers and cuts costs, which lifts operating margin. The value chain view shows the saving came from one activity, not from the whole business.
Example
A software start-up chooses a focus strategy aimed at small dental practices. By serving that niche better than large generic vendors, it can charge higher prices and keep customers loyal. Its smaller scale does not matter, because it competes where the large vendors are weakest.
Case study
Seen in the real world.
Larkspur Foods is a fictional packaged-snack maker weighing an expansion. In this illustrative review, the finance director asks the strategy team for a Porter analysis before approving a $10,000,000 investment in a new factory. The team finds that supermarkets, which buy most of the output, are few and powerful, and that new brands enter easily.
The five forces suggest margins will stay thin. The finance director therefore uses a lower profit assumption in the model, and the project's expected return falls below the company's required rate. She asks the team to look at whether a premium, differentiated product could escape the pressure, and to estimate how much extra price shoppers would accept for it.
The team proposes a healthy-snack line sold directly online. The revised model shows better margins, and the board approves a smaller first phase of $3,000,000 while testing demand, with a review after twelve months before releasing the remaining $7,000,000.
Watch out
Common mistakes.
- Treating the framework as a formula. It guides thinking, but the conclusions depend on judgement and good information.
- Defining the industry too broadly or too narrowly. The forces differ between, for example, all food and premium snacks.
- Doing the analysis once and filing it away. Competitive conditions change as new rivals, technologies and customer habits appear, so the analysis should be revisited at least yearly.
Questions
People also ask.
What are the five forces?
New entrants, supplier power, buyer power, substitutes and rivalry among competitors.
How does it relate to finance?
It explains why returns and margins differ between industries, which supports forecasting and valuation, and it helps a finance team challenge optimistic growth assumptions.
Is there a link to the Porter Diamond?
Yes. Both come from Michael Porter, but the diamond looks at why nations or regions produce winning industries.
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