ACCA Strategic Professional · Strategic Business Leader
Competitive Forces for ACCA SBL: Chapter Guide
Competitive forces are the pressures that shape how profitable an industry is. Porter's Five Forces covers new entrants, buyer power, supplier power, substitutes and rivalry. To solve an SBL question, rate each force using facts from the case, then state what it means for the organisation's strategy and profit.
What this chapter covers
This chapter is about industry analysis. It asks one question: why are some industries more profitable than others? Porter's Five Forces answers it by looking at five pressures: the threat of new entrants, the bargaining power of buyers, the bargaining power of suppliers, the threat of substitutes and competitive rivalry. The stronger the forces, the lower the profit potential for the average firm.
The chapter then tests the model. You look at its limits, such as its focus on a single industry, its static view and its neglect of complementors. You also learn the sixth force idea, which adds complementors or the role of government and other outside players. Finally, you link the forces to the industry life cycle, because the strength of each force changes as an industry moves from introduction to growth, maturity and decline.
In SBL, this chapter sits inside the external analysis part of strategic position. It links to PESTEL (the macro environment), to strategic choices such as generic strategies and diversification, to competitive advantage and to risk. In the case study you rarely get a standalone Five Forces question. You are more likely to be asked to assess the attractiveness of a market, advise on entering or leaving an industry, or explain why margins are under pressure. The forces give you a structure for that advice.
SBL is a written case study with 80 technical marks and 20 professional skills marks, and the technical marks reward analysis applied to the scenario. Five Forces is one of the most used frameworks for that, and it is easy to use badly. Students who list the forces without case facts score poorly. Students who pick the relevant forces, use evidence, judge their strength and draw a conclusion show analysis and commercial acumen, which are the skills the examiner is looking for. The chapter also feeds into strategy, risk and recommendation tasks, so the effort pays off across the whole paper.
Competitive forces: topics in the order to study them
- 1Porter's Five Forces ModelStart here to learn the overall model, what it measures and how the five forces fit together.
- 2Barriers to Entry and Threat of New EntrantsThis is the first force and it introduces the idea of judging strength, so it sets the pattern for the others.
- 3Buyer and Supplier Bargaining PowerThese two forces mirror each other, so you learn them together and avoid mixing up the drivers.
- 4Substitutes and Competitive RivalryStudy these last of the five because rivalry is the result of the other forces and substitutes are often confused with rivals.
- 5Limitations of Five Forces and the Sixth ForceYou can only criticise the model once you know it well, and critical evaluation earns higher-level marks.
- 6Industry Life Cycle and Competitive ForcesThis closes the chapter by adding time, showing how the forces change as the industry matures.
How to prepare Competitive forces
Aim to use the model as a tool for judgement, not as a list to recite. Prepare in a way that trains you to link theory to case facts quickly.
- Learn the five forces and the main drivers of each one, so you can recall them from memory without a prompt.
- For each force, write one question that tests its strength, such as how easy it is for a buyer to switch, and use these questions as a checklist.
- Practise on real industries you know, such as airlines, supermarkets or software, and rate each force high, medium or low with a reason.
- Work through case-style scenarios. Underline the facts that relate to each force and then write a short paragraph that links the fact to the force and to profit.
- Add the limits of the model and the sixth force as a way to challenge your own analysis, and use them when a requirement asks you to evaluate.
- Learn the life cycle stages and note how entry, rivalry and buyer power shift in each one.
- Finish by writing timed answers that end with a clear recommendation, and mark yourself on analysis and on professional skills such as communication and commercial acumen.
Common mistakes in Competitive forces
Listing the five forces with textbook definitions and no case facts.
Fix: For every force you mention, quote or use a fact from the scenario, say whether the force is high or low and explain the effect on profit.
Confusing substitutes with competitive rivals.
Fix: Ask whether the product meets the same need in a different way. If yes, it is a substitute. If it is the same type of product from another firm, it is a rival.
Writing about all five forces when the requirement needs only one or two.
Fix: Choose the forces that matter most in the case, say why, and spend your time on those. Skip the rest or mention them briefly.
Stopping at analysis and giving no conclusion.
Fix: End with what the analysis means: is the industry attractive, what should the organisation do and what risks remain.
Analysing the wrong industry or an industry that is too broad.
Fix: State the industry or segment in one line first and then analyse the forces for that definition.
Treating the forces as fixed and ignoring change over time.
Fix: Note how technology, regulation and industry maturity may shift each force, and say which way the forces are likely to move.
Last-day revision: Competitive forces
- Five Forces: new entrants, buyer power, supplier power, substitutes and rivalry.
- Stronger forces mean lower industry profit potential for the average firm.
- Entry barriers include economies of scale, capital needs, brand loyalty, access to distribution, regulation and switching costs.
- Buyer power is high when buyers are few, buy in volume, face low switching costs or can integrate backwards.
- Supplier power is high when suppliers are few, inputs are unique or switching is costly, or when suppliers can integrate forwards.
- Substitutes meet the same need in a different way, while rivals sell the same type of product.
- Rivalry is higher with many equal-sized competitors, slow growth, high fixed costs and high exit barriers.
- Five Forces looks at an industry, so define the industry boundaries before you start.
- Limits: the model is static, treats firms alike, ignores complementors and may not suit fast-changing or non-profit settings.
- The sixth force idea adds complementors or other outside players that raise the value of your product.
- Industry life cycle: introduction, growth, maturity and decline, and rivalry usually rises as growth slows.
- Always apply to the case, judge the strength of each force and finish with a conclusion on attractiveness or strategy.
Competitive forces practice questions
- Zephyr Brew, a regional coffee roaster, notes that a global retailer is considering entering its market. The retailer would need to build ro…
- Veltra Foods, a long-established producer of packaged soups, enjoys cost savings because each additional unit it makes lowers the average co…
- Dorset Bakeries buys flour from many mills and the product is a standard commodity. Recently, the largest mill, Granary plc, announced it wo…
- Norfield Hotels, a chain with many small independent rooms-booking customers, sells most rooms through two large online travel platforms whi…
- Verdant Pharma analyses the generic medicines industry using Five Forces. An adviser says the analysis should be extended to include a 'sixt…
- Orlin Telecom sells fixed-line services in a declining market. Management argues that because the industry is in decline, it should immediat…
- Norvik Telecom wants to assess the attractiveness of the mobile network industry. It finds that building a network needs very large capital …
- Calderon Motors, a regional car maker, uses Porter's Five Forces to assess its industry. A board member notes that the analysis ignores the …
Competitive forces in other exams
The same ground in other exams, if you are preparing for more than one or want another angle on it.
Competitive forces: frequently asked questions
Will SBL ask me to draw a Five Forces diagram?
Not usually. The exam is written and rewards analysis applied to the case. A short list of forces with case-based reasoning is better than a drawing, so use headings or bullets if they help the marker follow your answer.
Do I have to use all five forces in every answer?
No. Read the requirement and choose the forces that are most relevant to the case. Explain why those forces matter and keep the rest brief or leave them out.
How is the sixth force different from the original five?
The original five describe pressures that reduce profit. The sixth force idea, often linked to complementors, looks at other parties whose products or actions raise the value of your offer. It reminds you that firms can gain from cooperation as well as suffer from competition.
How does the industry life cycle link to Five Forces?
The strength of each force changes with the stage of the industry. For example, rivalry tends to intensify when growth slows in maturity, and entry barriers may differ between the early and later stages. Use this to say how attractive the industry is now and how it may look in future.