Strategic Management and Corporate Finance · Competitive Positioning

Porter's Five Forces Model Explained with Examples

Updated 11 October 2026 · Fact-checked

Porter's Five Forces model analyses the structure of an industry to judge how profitable it can be. The five forces are threat of new entrants, bargaining power of buyers, bargaining power of suppliers, threat of substitutes and rivalry among existing competitors. To solve a question, assess each force as high, medium or low, using facts, and then conclude.

Understand Porter's Five Forces Model

Every industry does not earn the same profit. Some industries, like cement or airlines, struggle to hold margins. Others, like branded consumer goods, earn well for years. Michael Porter argued that the reason lies in the structure of the industry, not only in how well one firm is run.

He identified five forces that together decide how much profit stays with firms in an industry. The stronger the forces, the more profit is competed away or taken by others. The weaker the forces, the more profit firms can keep.

The five forces are:

Threat of new entrants: New firms bring capacity and push prices down. The threat is low when barriers to entry are high, such as economies of scale, heavy capital needs, licences, brand loyalty, access to distribution and switching costs.
Bargaining power of buyers: Buyers are strong when they are few, buy in large volumes, can switch easily, are price sensitive or can integrate backwards. Strong buyers force prices down or demand more quality.
Bargaining power of suppliers: Suppliers are strong when they are few, their input is unique or costly to switch from, or they can integrate forward. They can raise input prices and squeeze margins.
Threat of substitutes: Substitutes are different products that meet the same need. Examples are an e-mail service replacing postal mail, or a ride-hailing app replacing a second car. They cap the price an industry can charge.
Rivalry among existing competitors: Rivalry is intense when there are many equal-sized firms, growth is slow, fixed costs are high, products are similar, switching costs are low and exit barriers are high.

The model is used at the industry level. A strategist uses the result to decide whether to enter or stay in an industry, and where to position the firm so as to defend against the strongest forces. It is a tool of external analysis, so it sits alongside PESTEL, which looks at the wider macro environment.

It has limits. It gives a snapshot of a moment, assumes industry boundaries are clear, and pays little attention to the role of complementors, government and technology change. Many analysts add a sixth force for complementors or government, but the standard model has five.

Key rules to remember

Core idea of the model: Industry profit potential = f(entrants, buyers, suppliers, substitutes, rivalry); This is a framework, not a numerical formula. Stronger forces mean lower profit potential for the industry.
The five forces: 1. Threat of new entrants; 2. Bargaining power of buyers; 3. Bargaining power of suppliers; 4. Threat of substitutes; 5. Rivalry among existing competitors; Learn this list in order. Examiners often ask you to name and explain all five.
Barriers to entry: Economies of scale, capital requirement, product differentiation, switching costs, access to distribution, government policy, cost advantages independent of scale; High barriers reduce the threat of new entrants.
Conditions for strong buyers or suppliers: Few in number + large volume + easy switching + ability to integrate; The same logic applies to buyers and suppliers. For suppliers, add a unique or costly-to-replace input.

How to solve Porter's Five Forces Model questions

Use the same structure for any case or theory question on the five forces. Always tie each force to facts in the question and end with a conclusion.

1Read the case and identify the industry and the firm. Define the industry boundary clearly, such as Indian two-wheelers or telecom services.
2State the model in one or two lines: it analyses industry structure through five forces that decide profit potential.
3Take the forces one by one. For each, name it, give the factors that make it strong or weak, and apply the facts of the case.
4Rate each force as high, medium or low. Give a short reason for each rating.
5Identify the one or two strongest forces. These drive the industry's profitability.
6Conclude on how attractive the industry is, and suggest how the firm should respond, for example by building entry barriers, locking in suppliers or differentiating.
7If the question asks for limitations, add two or three, such as a static view and the difficulty of defining the industry.

Quickest way: Five-force table in your head

When to use it: Use this when time is short or the case has many facts and you must cover all five forces in about ten minutes.

Write the five forces as short headings in the margin: Entrants, Buyers, Suppliers, Substitutes, Rivalry.
Read the case once and tick the facts against each heading.
Write two or three lines per force: the factor, the fact, the rating.
Write a two-line conclusion naming the strongest force and the likely effect on profit.
Add one line on strategy only if the question asks what the firm should do.

Common mistakes in Porter's Five Forces Model

Treating the model as a firm-level analysis
Students mix it up with SWOT or the value chain, which look inside the firm.
Fix: Say clearly that the model analyses the industry. Then link the result to the firm's position.
Confusing substitutes with competitors
Both seem to take customers away from the firm.
Fix: A competitor sells the same type of product. A substitute meets the same need in a different way, like online video calls replacing business travel.
Listing the forces without applying case facts
Students memorise definitions and stop there.
Fix: For each force, add at least one fact from the case and a rating of high, medium or low.
Calling every force strong
Students fear missing marks, so they say everything is a threat.
Fix: Judge each force. A good answer shows which forces are strong and which are weak, and why.
Mixing up buyer power and supplier power
Both use the same logic, so the direction gets reversed.
Fix: Buyers pay the firm. Suppliers sell inputs to the firm. Ask who is squeezing whom on price.
Skipping the conclusion or limitations
Students run out of time after the five forces.
Fix: Keep two minutes for a conclusion on industry attractiveness and, if asked, two or three limitations.

Worked examples

Example 1

Explain how Porter's Five Forces model would be used to assess the attractiveness of the Indian domestic airline industry. (Answer in a case-style format.)

Show the solution

Model: The model analyses industry structure through five forces. It helps judge whether airlines can earn good profits.
Threat of new entrants: Moderate to high. Capital needs, aircraft leasing, airport slots and licences are barriers. Leasing, however, lowers the cost of entry, so new airlines can start with modest capital.
Buyer power: High. Passengers compare fares online, switch easily and are price sensitive, especially on leisure routes. Travel portals add to their power.
Supplier power: High. Aircraft makers are very few, and fuel is bought at prices the airline cannot control. Airports and ground services can also charge heavily.
Threat of substitutes: Medium. Trains, especially faster ones, and road travel compete on short routes. Video calls reduce some business travel.
Rivalry: High. A few large airlines compete on price, products are similar, fixed costs are high and switching costs for passengers are low.
Conclusion: Most forces are strong, so industry profit potential is low. Airlines should seek differentiation through service, loyalty programmes, route strength and cost control.

Answer: Applying the five forces shows that buyer power, supplier power and rivalry are high, entry and substitutes are moderate, so the airline industry has low profit potential. Firms should focus on cost control, loyalty and differentiation.

Example 2

A mid-sized Indian company supplies packaged drinking water in a city. There are many small local brands, customers choose on price, and the company buys plastic bottles from two large manufacturers. Using Porter's model, identify the strongest forces and suggest a response.

Show the solution

Rivalry: High. There are many small brands, the product is almost identical and customers choose on price. This pushes margins down.
Buyer power: High. Customers have many options and switch at no cost, so they can demand lower prices.
Supplier power: High. Only two large manufacturers supply bottles. With few suppliers, they can raise prices or set terms.
Threat of new entrants: Likely medium to high. Starting a small bottling plant needs modest capital, though licences and quality standards add some barrier.
Threat of substitutes: Medium. Home water purifiers, tap water and reusable bottles meet the same need.
Strongest forces: Rivalry, buyer power and supplier power. Together they squeeze profit from both sides.
Response: Build a differentiated brand based on trust and quality. Secure supply with long-term contracts or by adding more bottle suppliers. Use distribution strength in offices, events and stores to build loyalty.

Answer: Rivalry, buyer power and supplier power are the strongest forces. The company should differentiate its brand, reduce dependence on the two bottle suppliers through contracts or new sources, and build distribution loyalty.

Exam tips

Case questions award marks for applying facts. Quote the fact from the case next to each force.
Always name all five forces, even if the question gives facts for only some. Say briefly that a force is low where the case is silent.
Use the words high, medium or low for each force and justify the rating in one line.
End with a conclusion on industry attractiveness. Add strategy suggestions only when the question asks for them.
If a question asks for limitations, give a short list of two to four points with a reason for each.

Practice questions from Competitive Positioning

Porter's Five Forces Model in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Porter's Five Forces Model: frequently asked questions

What are the five forces in Porter's model?

They are the threat of new entrants, bargaining power of buyers, bargaining power of suppliers, threat of substitutes and rivalry among existing competitors. Together they decide the profit potential of an industry.

How do I apply Porter's Five Forces to a case study in the exam?

Name each force, list the factors that make it strong or weak, apply facts from the case and rate it. Then identify the strongest forces and give a conclusion on industry attractiveness.

What are the limitations of Porter's Five Forces model?

It gives a static view of an industry and may not capture fast change. It is hard to define industry boundaries, and it gives little weight to complementors, government and technology. It also looks at the industry and not at a firm's own resources.

What is the difference between a substitute and a competitor?

A competitor sells the same kind of product in the same industry. A substitute is a different product or service that meets the same customer need, such as a rail journey replacing a short flight.