A regional bakery chain is selling more bread than ever. Revenue is up for the third year running, yet the margin on every loaf keeps getting thinner. The owner suspects the problem is operational. Porter's Five Forces suggests she is looking in the wrong place: the pressure is coming from the industry itself, not from anything happening inside her bakeries.
What Porter's Five Forces is, in plain words
Porter's Five Forces, developed by Michael Porter, examines the structure of an industry rather than the performance of one company within it. It looks at five sources of competitive pressure: the threat of new entrants, the bargaining power of suppliers, the bargaining power of buyers, the threat of substitute products, and rivalry among existing competitors. Together they explain why some industries are consistently more profitable than others, whatever any single company does. Porter first published the model in the Harvard Business Review in 1979, and it remains one of the few strategy tools that explicitly separates industry attractiveness from any single company's execution: a distinction that other frameworks, built around a single business, tend to blur without meaning to.
When to use it (and when not to)
- Use it when profitability is falling across a whole industry and you need to understand why, not just what your own business is doing wrong.
- Use it before entering a new market or industry, to judge whether the structure supports healthy margins at all.
- Use it alongside pricing or investment decisions, since it explains how much pricing power you realistically have.
- Do not use it to analyse a single competitor's tactics: that is company-level thinking, and Five Forces works at the industry level.
- Do not treat the five scores as fixed; industry structure shifts as regulation, technology and buyer habits change.
The mistake most people make with Porter's Five Forces
The common error is applying the model to a company instead of an industry. Teams write "our brand is strong" under rivalry, or "our factory is efficient" under new entrants: company facts dressed up as industry analysis. That misses the point entirely: Five Forces asks what is true for everyone competing in this space, not what makes your business special.
The second, quieter mistake is stopping at buyers and suppliers and forgetting substitutes. For the bakery, the sharpest force is not a rival bakery: it is supermarket own-label bread, which is not a bakery at all but competes for the same spending. Substitutes are easy to underrate because they rarely look like direct competitors.
This confusion is easiest to spot when two competitors in the same industry score the five forces completely differently. If supplier power, buyer power and rivalry are genuinely industry-wide conditions, every serious competitor should reach broadly similar conclusions about them, even where they respond to those conditions differently. When scores diverge sharply between two companies selling the same product to the same customers, the analysis has usually drifted from the industry back to the company.
A worked example, halfway
Illustrative example: a fictional company, not a customer case.
Back to the bakery chain. Working through the five forces: supplier power is rising, because a handful of Dutch and Belgian flour mills control most of the regional supply and have been raising prices. Buyer power is also rising, since supermarkets now stock artisan-style own-label loaves at a lower price point, giving households an easy substitute and giving supermarket chains, as channel partners for wholesale supply, leverage over terms.
New entrant risk is worth a look too: bakery equipment, premises and trained staff represent a real barrier to opening a dedicated bakery, but a supermarket adding an in-store bakery counter is a far lower-barrier way to compete in the same category, without building a standalone bakery brand at all. That third force adds further pressure the sales figures alone never revealed, and it points toward a different kind of competitor than the bakery owner had been watching.
Two forces already point the same way: less pricing power than the sales figures suggest. The card takes you through the remaining steps to a decision.
What's on the BizDecks card
- Front: what Porter's Five Forces is for and when an industry-level view, not a company-level one, is what a decision needs.
- Back: the numbered steps to apply the model, plus a short worked example of its own. The company in this guide is a separate illustration, not the example printed on the card.
- Digital: a Miro board laid out as the five-forces diagram for team scoring, with a video tutorial.
Related models
- SWOT Analysis is the natural next step, turning the threats you have identified into a broader set of choices.
- PESTLE Analysis covers the macro factors (political, legal, technological) that sit above industry structure and can shift all five forces at once.
- Value Chain Analysis moves from industry structure to where your own business actually creates and captures value.
BizDecks is the cheat sheet for business decisions: 50 models, one card each. See the toolkits.