Porter's five forces (Michael Porter, 1979) is a model for judging how competitive and profitable an industry is. It looks at five pressures: threat of new entrants, supplier power, buyer power, threat of substitutes and rivalry among existing competitors. The stronger the forces, the harder it is to make a good profit.
The five forces explained
| Force | Strong when... | Effect on profits |
|---|---|---|
| Threat of new entrants | Barriers to entry are low: little capital needed, no economies of scale, easy access to distribution, weak brands, light regulation, low customer switching costs | Newcomers add capacity and push prices down |
| Bargaining power of suppliers | Few suppliers, unique inputs, high costs of switching supplier, suppliers could integrate forward | Suppliers raise prices or cut quality |
| Bargaining power of buyers | Few large buyers, standard products, low switching costs, buyers could make the product themselves, price-sensitive customers | Buyers force prices down or demand more |
| Threat of substitutes | A different product meets the same need at a good price-performance trade-off, and switching is easy | Caps the price the industry can charge |
| Competitive rivalry | Many similar-sized rivals, slow market growth, high fixed costs, little differentiation, high exit barriers | Price wars, heavy marketing, lower margins |
Porter's point is that these forces, not how fast an industry is growing, decide its long-run profitability (Harvard Business School, Institute for Strategy and Competitiveness).
How to do a five forces analysis, step by step
- Define the industry precisely: product and geography. 'Budget airlines in Europe' gives a clearer answer than 'travel'.
- Assess each force as high, medium or low, with evidence from the case for each rating.
- Identify the strongest forces. These are what hold down profits.
- Judge overall industry attractiveness.
- Recommend a response: how can the organisation reduce the strongest forces? For example, raise switching costs, differentiate, lock in suppliers, or build barriers to entry.
Five forces example: UK grocery retail
| Force | Rating | Why |
|---|---|---|
| New entrants | Medium | Huge scale and property needed, but discounters and online grocers have entered successfully |
| Supplier power | Low to medium | Most food suppliers are small relative to the big chains, though major branded manufacturers have more power |
| Buyer power | High | Shoppers can switch store easily and compare prices online |
| Substitutes | Medium | Restaurants, takeaways and meal kits meet the same need |
| Rivalry | High | A few large chains plus discounters competing hard on price in a slow-growing market |
| Overall | Low attractiveness | Thin margins; success needs scale, efficiency or clear differentiation |
How five forces come up in ACCA SBL
Use it when a task asks about the attractiveness of an industry, the threat from a new competitor, or whether to enter a market. Base each force on case facts, not general knowledge, and finish with what management should do. ACCA's examining team stresses applying models to the scenario rather than describing them (ACCA).
Five forces vs PESTEL vs SWOT
| Model | Level | Use it to |
|---|---|---|
| PESTEL | Macro-environment | Spot big external trends |
| Five forces | Industry | Judge competitive pressure and profitability |
| Value chain | Organisation | Find internal strengths and weaknesses |
| SWOT | Summary | Bring it all together, then build options with TOWS |
Advantages and limitations
Advantages
- Clear structure for industry analysis
- Explains why some industries earn more than others
- Points directly to strategic responses
Limitations
- A snapshot; industries change
- Hard to define the industry in digital and platform markets
- Ignores cooperation, alliances and complementary products
- Says little about the organisation's own resources
FAQs
What are Porter's five forces?
Threat of new entrants, bargaining power of suppliers, bargaining power of buyers, threat of substitute products or services, and rivalry among existing competitors.
Who created the five forces model?
Michael Porter, first described in his 1979 Harvard Business Review article 'How Competitive Forces Shape Strategy', and updated in 2008 as 'The Five Competitive Forces That Shape Strategy'.
What is the difference between Porter's five forces and PESTEL?
PESTEL scans the wide macro-environment (politics, economy, society, technology, environment, law). Five Forces looks at one industry and the competitive pressures that set its profitability.
What makes an industry attractive under the five forces?
Weak forces: high barriers to entry, weak suppliers and buyers, few substitutes and mild rivalry. Strong forces squeeze profits.
Is the five forces model still relevant?
Yes for understanding industry profitability, but it is a snapshot, can miss collaboration and ecosystems, and needs care in fast-changing digital markets where industry boundaries blur.