CFA Level I Exam · Industry and Competitive Analysis

Porter's Five Forces Framework for CFA Level I

Updated 7 October 2026 · Fact-checked

Porter's Five Forces is a framework that explains industry profitability through five pressures: rivalry among existing competitors, threat of new entrants, threat of substitutes, bargaining power of buyers, and bargaining power of suppliers. Rate each force as strong or weak. The stronger the forces, the lower the industry's long-run profit potential.

Understand Porter's Five Forces Framework

Industry analysis asks one question: how much profit can a typical company in this industry earn over the long run? Porter's Five Forces answers it by looking at who can take profit away from the industry's firms.

There are five forces. Rivalry among existing competitors is the fight between current firms over price, features and market share. Threat of new entrants is the risk that new firms join and add capacity. Threat of substitutes is the risk that customers switch to a different product that meets the same need. Bargaining power of buyers is customers' ability to push prices down or demand more for the same price. Bargaining power of suppliers is the ability of input providers to raise prices or cut quality.

The logic is simple. Each force is a claim on industry profit. Rivals compete it away through price cuts. Entrants dilute it. Substitutes cap the price you can charge. Powerful buyers take it as discounts. Powerful suppliers take it as higher input costs. When all five are weak, the industry is structurally attractive and firms can earn returns above their cost of capital for long periods.

The framework looks at industry structure, not at one company's execution. A well-run firm in a bad industry can still earn poor returns. An analyst uses the result to judge pricing power, margins and how sustainable profits are, then moves on to a company's competitive strategy.

Keep two pairs apart. Entrants and substitutes both come from outside the industry. Entrants offer the same kind of product. Substitutes offer a different product that meets the same need. Buyers and suppliers are both bargaining forces. Buyers sit downstream and suppliers sit upstream.

Key formulas to remember

Rivalry is intense when: Many or equal-sized competitors + slow industry growth + high fixed costs + low differentiation + high exit barriers; These conditions push firms to compete on price. The opposite conditions make rivalry mild.
Threat of entrants is high when: Low barriers: little scale advantage, low capital needs, easy distribution access, weak brands, low switching costs, no regulatory limits; High barriers (economies of scale, strong brands, patents, licences, high capital needs) reduce the threat.
Threat of substitutes is high when: Close substitutes exist + low switching cost + substitute offers better price-performance; Substitutes limit the price ceiling for the whole industry.
Buyer power is high when: Few buyers or large purchase volumes + standardized product + low switching costs + buyers can integrate backward + buyers are price sensitive; Buyers' power rises when they are concentrated and the product is undifferentiated.
Supplier power is high when: Few suppliers + unique or differentiated inputs + high switching costs + no substitute inputs + suppliers can integrate forward; Suppliers gain power when the industry is not an important customer for them.
Overall conclusion: Stronger forces → lower profit potential and pricing power; weaker forces → higher profit potential; The framework describes industry attractiveness, not any single firm's results.

How to solve Porter's Five Forces Framework questions

Use the same sequence for any scenario or definition question on the five forces.

1Identify what the stem describes: a fact about competitors, new firms, alternative products, customers or input providers.
2Map each fact to one force. Ask: is this inside the industry (rivalry), outside with the same product (entrants), outside with a different product meeting the same need (substitutes), downstream (buyers) or upstream (suppliers)?
3Decide the direction. Does the fact make the force stronger or weaker? Use the conditions in the key rules.
4Link the force to profitability: a stronger force lowers pricing power or raises costs, which squeezes margins.
5Check what the question asks: which force, which direction, or the effect on profit or structure.
6Eliminate options that name the wrong force or reverse the direction. Pick the remaining answer.

Quickest way: Upstream, downstream, same product, different product

When to use it: Use it for classification questions where you must name the force fast, with about 90 seconds per question.

Upstream firm named: supplier power.
Downstream customer named: buyer power.
New firm making the same product: entrants.
Different product meeting the same need: substitutes.
Existing firms fighting on price or share: rivalry.
Then ask: concentrated, unique or hard to switch means strong power; fragmented, standard or easy to switch means weak power.

Common mistakes in Porter's Five Forces Framework

Confusing threat of substitutes with threat of new entrants.
Both are outside pressures, and the words sound similar.
Fix: Entrants sell the same type of product. Substitutes sell a different product that meets the same need, such as video calls replacing business travel.
Assuming high barriers to entry also reduce rivalry among existing firms.
Students link all barriers to less competition.
Fix: High entry barriers mainly reduce the threat of new entrants; they do not by themselves reduce rivalry among existing firms. High exit barriers can intensify rivalry because weak firms stay and keep competing.
Saying a strong force raises industry profitability.
Strong sounds good, so students confuse strong force with strong industry.
Fix: A strong force is bad for industry profit. Weak forces mean an attractive industry.
Mixing up buyer power and supplier power direction.
Both involve bargaining over price.
Fix: Buyers want lower selling prices, so they hurt revenue. Suppliers want higher input prices, so they hurt costs.
Using the framework to judge one company's performance.
Candidates mix it with company-level strategy analysis.
Fix: The five forces describe industry structure. Company strategy, such as cost leadership or differentiation, is a separate step.
Assuming a single force decides everything.
A stem highlights one fact and students stop reading.
Fix: Read all facts. The question may ask for the overall effect, so net out opposing forces.

Worked examples

Example 1

An analyst studies the commodity packaging industry. Three large retail chains buy most of the output, the product is standardized, and the chains can switch supplier at almost no cost. Which force is most clearly strong, and what is the likely effect on industry profitability? A. Threat of substitutes; lower profitability. B. Bargaining power of buyers; lower profitability. C. Bargaining power of suppliers; higher profitability.

Show the solution

The facts describe customers, so this is a downstream force: buyers.
Few buyers with large volumes, a standardized product and low switching costs all make buyer power high.
Strong buyer power pushes selling prices down, which reduces margins.
Option A has the right direction but names the wrong force: nothing in the stem describes an alternative product.
Option C names the wrong side of the chain and also reverses the direction, since a strong force lowers profit.

Answer: B. Bargaining power of buyers is strong, which lowers industry profitability.

Example 2

A regional airline industry faces a new high-speed rail line that offers similar journey times and lower fares on its busiest routes. Which force does this describe, and how does it affect the industry? A. Threat of substitutes; it caps the prices airlines can charge. B. Threat of new entrants; it caps the prices airlines can charge. C. Rivalry among existing competitors; it reduces price competition.

Show the solution

Rail is a different product that meets the same need (travel between cities), so it is a substitute, not an entrant.
A close substitute with lower price and similar performance limits how high airlines can set fares.
Option B has a plausible effect but misclassifies the force: rail is not a new airline selling the same product.
Option C names the wrong force and wrongly says competition falls.

Answer: A. It is a threat of substitutes that caps industry prices.

Exam tips

Questions are standalone and usually give a short scenario. Name the force first, then judge direction, before reading the options.
Watch for options that reverse the direction, such as saying a strong force raises profit. Eliminate them quickly.
Expect entrants versus substitutes traps. Ask whether the new offering is the same product or a different one meeting the same need.
Remember that high exit barriers can raise rivalry, while high entry barriers mainly lower the entrant threat and do not by themselves reduce rivalry.
With no penalty for wrong answers, always answer. Eliminating the wrong force usually leaves a clear choice.

Practice questions from Industry and Competitive Analysis

Porter's Five Forces Framework 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 Framework: frequently asked questions

What are the five forces in Porter's framework?

They are rivalry among existing competitors, threat of new entrants, threat of substitutes, bargaining power of buyers and bargaining power of suppliers. Together they determine how much profit a typical firm in the industry can keep.

What is the difference between threat of substitutes and threat of new entrants?

New entrants sell the same type of product and join the industry. Substitutes sell a different product that satisfies the same customer need, and they stay outside the industry. Both reduce profit, but entrants add capacity while substitutes cap prices.

How do the five forces affect industry profitability?

Each force takes a share of industry profit. Strong forces lower pricing power or raise costs, so profit potential falls. When the forces are weak, the industry can earn returns above its cost of capital for longer.

Do I need to memorize lists of factors for each force?

Know the main conditions that make each force strong or weak, as in the key rules above. Exam questions give a scenario and ask you to classify it, so understanding the logic matters more than a long list.