Industry analysis frameworks: Porter's five forces and value chains

What you will learn

• How each of Porter's five forces limits the profits of an industry
• How to turn the forces into a simple, repeatable scorecard
• How to map an industry value chain and calculate its profit pool
• Why industry structure and a single company's moat are different questions

Explanation

Competitive advantages of single companies (moats) are covered in the course on stocks. Here the question is one level higher: is the industry as a whole a good place to earn money?

The five forces

The economist Michael Porter described five forces that determine how much of the value an industry creates it can keep as profit:

1. Rivalry among existing competitors: price wars and heavy discounting are more likely when there are many similar competitors, slow growth, high fixed costs and products that customers see as identical.
2. Threat of new entrants: low when entry needs large capital, licences, scale, patents, distribution networks or strong brands. These are called barriers to entry.
3. Bargaining power of suppliers: high when few suppliers provide an essential input and switching to another supplier is costly.
4. Bargaining power of buyers: high when a few large customers buy a large share of output, products are standardised and switching costs are low.
5. Threat of substitutes: a substitute is a different product that meets the same need, such as video calls instead of business flights.

Strong forces push profits down; weak forces allow high returns. A practical sign of an attractive industry is a return on invested capital (ROIC) that stays above the cost of capital for many years across most companies, not only for the leader.

Building a scorecard

To make the analysis comparable, rate each force from 1 (weak, good for profits) to 5 (strong, bad for profits) and write one line of evidence for each score. Use observable facts: market shares, customer concentration, contract length, capital needed for a new plant, regulation. Optionally weight the forces if one clearly dominates (for example, buyer power in car parts suppliers). The scorecard does not produce a "true" number; its value is that it forces you to give reasons and to compare industries consistently.

The value chain and the profit pool

An industry value chain lists the stages from raw materials to the end customer, for example: components, manufacturing, brands and assembly, distribution and retail, after-sales service. Each stage can have a different structure and therefore different margins.

The profit pool is the total profit earned across all stages. Calculate it as revenue × operating margin for each stage and add the results. Often a stage with a small share of revenue earns a large share of profit, because it has fewer competitors or controls a key technology. Investors look for that stage.

Value chains change. New technology, regulation or a new business model can move profits from one stage to another, for example from hardware to software or from retailers to online platforms. Ask: which stage is gaining bargaining power?

Worked example

Hypothetical example: a European e-bike industry has four value-chain stages. Figures are invented round numbers; taxes and intra-group effects are excluded.

Steps: profit of drive systems = €4.0bn × 15% = €0.60bn; repeat for each stage; total profit pool = €1.35bn. Share of profit for drive systems = 0.60 ÷ 1.35 = 44%. Average margin = 1.35 ÷ 18.0 = 7.5%.

Interpretation: drive systems earn 44% of the industry's profit with only 22% of revenue. A five-forces view explains why: few suppliers, patents and high development costs (high entry barriers) give them supplier power over frame makers and brands. Frame makers face many low-cost rivals and powerful buyers, so their margin is thin.

Common mistake

Practice activity

Hypothetical industry: airport ground-handling services. Facts: (1) at most airports two or three handlers compete for contracts; (2) a few large airlines buy most of the services and run tenders every few years; (3) entry requires an airport licence and equipment, but equipment can be leased; (4) labour is the main input, and strikes are possible; (5) airlines can do some handling themselves. Rate each force from 1 to 5, give one reason each, and calculate the unweighted average.

Key takeaways

• The five forces explain why some industries keep high returns and others do not.
• A scorecard with written evidence makes industry comparisons consistent.
• Profit pools show which value-chain stage earns most of the profit, often not the largest by revenue.
• Growth alone does not make an industry attractive.

Next step

In the next lesson you will compare companies within one sector using a clean peer group and consistent metrics.