Porter's Five Forces

Michael Porter's Five Forces framework (1979) is one of the most influential models in strategic analysis. It provides a structured approach to assessing the competitive intensity and attractiveness of an industry. Rather than focusing on individual competitors, the model examines the broader forces that determine how much profit an industry can sustain — and therefore how strategically positioned a business is within that industry. This lesson covers AQA specification topic 3.7.7.

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The Five Forces

Porter identified five competitive forces that collectively determine the profitability of an industry:

Force	Key Question
1. Threat of new entrants	How easy is it for new competitors to enter the industry?
2. Bargaining power of buyers	How much power do customers have to drive down prices?
3. Bargaining power of suppliers	How much power do suppliers have to drive up costs?
4. Threat of substitute products	How easily can customers switch to alternative products or services?
5. Competitive rivalry	How intense is competition among existing firms in the industry?

When all five forces are strong, the industry is intensely competitive and profit margins are low. When the forces are weak, firms can earn sustained supernormal profits. The strategic goal is to position the business where the forces are weakest — or to take action to weaken them.

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Force 1: Threat of New Entrants

New entrants bring additional capacity, a desire to gain market share, and often new resources and ideas. Their entry puts downward pressure on prices and upward pressure on costs, reducing profitability for existing firms.

The threat of new entrants depends on the strength of barriers to entry:

Barrier	Description	Example
Economies of scale	Existing firms produce at lower average cost due to high volumes; new entrants start at a cost disadvantage	Aircraft manufacturing — Boeing and Airbus benefit from decades of scale
Capital requirements	High upfront investment is needed to enter the market	Telecommunications — building a network infrastructure requires billions
Brand loyalty	Consumers are attached to established brands, making it difficult for newcomers to attract customers	Soft drinks — Coca-Cola and Pepsi dominate; new entrants struggle to compete
Switching costs	Costs customers incur when changing suppliers	Enterprise software — migrating from SAP to a new system involves enormous time and expense
Access to distribution channels	Established firms control key distribution networks	Supermarket shelf space — incumbent brands occupy prime positions; new products struggle for visibility
Government regulation	Licences, patents or regulatory requirements restrict entry	Pharmaceuticals — new drugs require years of clinical trials and regulatory approval
Incumbent advantages	Existing firms have experience, supplier relationships and cost advantages not available to newcomers	Learning curve effects in complex manufacturing

Strategic Response

If barriers to entry are low, existing firms can:

• Build brand loyalty to make customers less willing to switch
• Invest in scale to create cost advantages
• Lock in customers through contracts or switching costs
• Lobby for regulation that raises barriers

Exam Tip: When assessing the threat of new entrants, do not just list barriers — evaluate which ones are most significant in the specific industry context. In the UK supermarket industry, for example, the biggest barrier is not regulation but the enormous capital required to build a national store network and supply chain. This is why Aldi and Lidl took decades to build meaningful UK market share despite having the financial resources of their German parent companies.

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Force 2: Bargaining Power of Buyers

Buyers (customers) exert power when they can negotiate lower prices, demand higher quality or play competitors against each other. Strong buyer power reduces industry profitability.

Factor Increasing Buyer Power	Explanation
Few buyers, many sellers	A small number of large buyers can negotiate aggressively
Low switching costs	Buyers can easily move to a competitor
Standardised products	When products are undifferentiated, buyers choose on price
Price sensitivity	Buyers who are highly sensitive to price will shop around for the cheapest option
Backward integration threat	Buyers could make the product themselves rather than buying it
Buyer has full information	Comparison websites and reviews give buyers transparency on prices and quality

Real-World Example: UK Supermarkets as Buyers

UK supermarkets (Tesco, Sainsbury's, Asda, Morrisons) have enormous bargaining power over food suppliers. They are few in number, buy in vast quantities, and can threaten to delist a supplier's products. The Groceries Code Adjudicator was established specifically to address the imbalance of power between supermarkets and their suppliers.

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Force 3: Bargaining Power of Suppliers

Suppliers exert power when they can raise prices, reduce quality or restrict supply. Strong supplier power increases costs and reduces profitability for businesses in the industry.

Factor Increasing Supplier Power	Explanation
Few suppliers, many buyers	Concentrated supply means buyers have limited alternatives
Unique or differentiated inputs	If the supplier's product is distinctive or essential, the buyer has no substitute
High switching costs	Changing supplier is expensive or disruptive
Forward integration threat	The supplier could start selling directly to end customers
Supplier's product is critical	If the input is essential to the buyer's product quality, the buyer cannot risk losing access

Real-World Example: Semiconductor Shortage