The five forces (Porter)

Michael Porter’s model explains industry profitability through the structural pressures that affect prices, costs and investment—not through rivalry alone.

When to use it

• Use it whenever assessing the attractiveness, evolution or boundaries of an industry.

Origins

Porter introduced the Five Forces to a wide audience in Competitive Strategy: Techniques for Analyzing Industries and Competitors in 1980. The framework brought industrial-organisation economics into practical strategy and showed how the combined structure of an industry constrains the returns available to its participants.

What it is

The 1980 model identifies five forces:

• rivalry among established competitors;
• threat of new entrants;
• threat of substitute products or services;
• bargaining power of buyers; and
• bargaining power of suppliers.

Rivalry sits at the centre of the familiar diagram, with the other forces exerting pressure on the industry from outside its current group of competitors.

How to use it

Define the industry and customer need before scoring anything. A boundary that is too narrow hides substitutes; one that is too broad averages away meaningful economics. Analyse current conditions and the direction of change for each force.

Rivalry among existing competitors

Rivalry tends to intensify when competitors are numerous or evenly matched, demand grows slowly, supply exceeds demand, fixed costs are high, offers are difficult to differentiate or exit barriers keep weak firms in the market. Scarcity can ease price pressure; chronic overcapacity usually increases it. Regulation, taxation, subsidy and labour institutions may alter both capacity and conduct.

Five forces shaping industry competition

Entry is harder when a credible competitor needs proprietary technology, scale, capital, scarce people, regulatory approval, brand investment or access to constrained channels. Network effects, customer switching costs and incumbent responses also matter. Evaluate the barrier’s durability rather than merely listing it.

Threat of substitutes

A substitute meets the same underlying need through a different product or process. Its pressure rises when it offers an attractive price-performance trade-off and customers can switch easily. Digital music, for example, substituted for physical retail distribution as well as for a particular disc format.

Buyer power

Buyers gain leverage when they are concentrated, well informed, price sensitive, able to switch or capable of integrating backwards. Large retailers and manufacturers can use purchasing scale to demand lower prices or better service. A seller can reduce power through genuine differentiation, switching benefits or a broader customer base.

Supplier power

Suppliers gain leverage when inputs are concentrated, distinctive, difficult to switch or capable of integrating forwards. A component converter may face powerful metal producers on one side and powerful automotive customers on the other, leaving little margin unless it owns a valuable capability.

Combine the findings to explain average industry economics and their likely evolution. Soft drinks, software and toiletries may benefit from relatively favourable structures, while airlines and textiles have often faced several adverse forces at once. Ask which force most affects price, cost or capital need; what will change it; and how the strategy can position the company where the forces are weakest or can be shaped responsibly.

Top practical tip

Analyse each force as a driver of price, cost or investment, and include regulation and other external institutions where they materially alter competition.

Top pitfall

Industry boundaries are analytical choices. A rigid definition can hide substitutes, complements and changing business models, producing a false conclusion.

Further reading

• Porter, M.E. (nineteen seventy-nine). “How Competitive Forces Shape Strategy.” Harvard Business Review.
• Porter, M.E. (nineteen eighty). Competitive Strategy: Techniques for Analyzing Industries and Competitors. Free Press.