Strategic Management and Corporate Finance · Competitive Positioning

Value Chain Analysis: Porter's Primary and Support Activities

Updated 11 October 2026 · Fact-checked

Value chain analysis, developed by Michael Porter, splits a firm into the activities it performs to create a product or service. Primary activities make and deliver the product. Support activities back them up. You assess each for cost and differentiation, and a margin is what remains after costs.

Understand Value Chain Analysis

Every firm does many things to turn inputs into something a customer pays for. Value chain analysis lists those activities one by one. The aim is simple: find which activities create value, which only add cost, and where the firm can do better than rivals.

Porter divides activities into two groups. Primary activities are directly involved in creating the product and getting it to the buyer. They are inbound logistics, operations, outbound logistics, marketing and sales, and service. Support activities help the primary ones work. They are firm infrastructure, human resource management, technology development and procurement.

The idea behind it is that competitive advantage does not sit in the firm as a whole. It sits in specific activities. A firm gains cost advantage by performing activities at lower cost than rivals. It gains differentiation by performing them in a way the buyer values and will pay more for. The margin is the gap between the total value the buyer pays and the total cost of performing all the activities.

The chain also has linkages. A choice in one activity changes the cost or performance of another. For example, spending more on quality inspection in operations may cut after-sales service costs. Gains often come from managing these linkages, and from linkages with suppliers and distributors, not from any single activity.

Do not confuse it with a supply chain. The value chain looks inside one firm and asks where value and cost arise. A supply chain is the network of firms, from raw material supplier to final customer, that moves goods and information. The value chain is an analysis tool. The supply chain is a flow of material.

Key rules to remember

Primary activities: Inbound logistics + Operations + Outbound logistics + Marketing and sales + Service; Directly create and deliver the product. Learn them in this order, which follows the flow of goods.
Support activities: Firm infrastructure + Human resource management + Technology development + Procurement; Support activities cut across all primary activities. Infrastructure covers general management, planning, finance, legal and compliance.
Margin: Margin = Total value created (what the buyer pays) − Total cost of all value activities; Advantage comes from a bigger margin than rivals, through lower cost, higher value, or both.

How to solve Value Chain Analysis questions

Use this method for any question that asks you to analyse a firm's value chain or to advise on where it can gain advantage.

1Identify the firm and its business, and state the product or service it sells to the buyer.
2List the primary activities in order and say what each means for this firm using facts from the case.
3List the support activities and show how each supports the primary ones.
4For each activity, judge its cost and its contribution to value. Note which are strengths and which are weak compared with rivals.
5Look for linkages between activities and with suppliers or distributors, and say how they change cost or value.
6Decide the source of advantage: cost leadership, differentiation, or both, and name the activities behind it.
7Recommend actions: improve, outsource, redesign or drop specific activities.
8Conclude with the effect on margin and competitive position.

Quickest way: Five-Nine scan

When to use it: Use when the case is long and you have only a few minutes to structure the answer.

Write the five primary headings and four support headings as a skeleton.
Read the case once and tag each fact against a heading.
Mark each tagged item as cost saving, value adding, or weakness.
Pick the one or two activities that drive the firm's advantage and write them first.
Close with a one-line recommendation linked to margin.

Common mistakes in Value Chain Analysis

Treating support activities as a separate department list and ignoring how they serve primary activities.
Students memorise the names without the logic.
Fix: For each support activity, write one line on which primary activities it helps, such as procurement lowering inbound input cost.
Mixing up value chain and supply chain.
Both involve flows from inputs to customer, so they look alike.
Fix: Say the value chain studies activities inside one firm for advantage, while the supply chain is the network of firms moving goods.
Placing activities in the wrong group, such as calling marketing a support activity or procurement a primary one.
Procurement sounds like inbound work and marketing sounds like a support function.
Fix: Remember that procurement is the purchasing function and is a support activity, while inbound logistics is receiving and storing inputs. Marketing and sales is primary.
Listing activities without judging cost or value.
Students describe instead of analysing.
Fix: After each activity, add a verdict: strength, weakness, cost driver or value driver, as the case facts suggest.
Ignoring linkages.
The chain is drawn as separate boxes.
Fix: Include at least one linkage example from the case and show how it changes cost or quality.
Giving generic advice that does not use the case facts.
Students run short of time and write textbook points.
Fix: Quote a fact from the case in each recommendation and tie it to a named activity.

Worked examples

Example 1

Name the primary and support activities in Porter's value chain and explain how value chain analysis helps a firm gain competitive advantage.

Show the solution

State the primary activities: inbound logistics, operations, outbound logistics, marketing and sales, and service.
State the support activities: firm infrastructure, human resource management, technology development and procurement.
Explain that advantage arises from performing specific activities at lower cost or in a more valued way than rivals.
Explain that the margin is the value buyers pay minus the cost of performing all activities, so analysing each activity shows where margin can grow.
Add that linkages between activities, and with suppliers and distributors, offer further gains.

Answer: Primary activities are inbound logistics, operations, outbound logistics, marketing and sales, and service. Support activities are firm infrastructure, HR management, technology development and procurement. Value chain analysis pinpoints which activities drive cost or buyer value, so the firm can cut cost, differentiate or manage linkages and widen its margin over rivals.

Example 2

Sundaram Foods Ltd, a Chennai packaged snack maker, buys potatoes from contract farmers, uses automated fryers, delivers through its own refrigerated vans and complains of high return rates from retailers. Rivals compete on price. Use value chain analysis to advise the firm.

Show the solution

Map the facts. Contract farmers and procurement of potatoes relate to inbound logistics and procurement. Automated fryers are operations and technology. Own vans are outbound logistics. Retailer returns point to a problem in outbound logistics, service or quality in operations.
Assess strengths: automation lowers unit cost and own vans give control of freshness.
Assess weakness: high returns raise cost and cut margin, and they signal a quality or shelf-life issue.
Look at linkages: better quality checks in operations or better packaging could reduce spoilage in transit and returns, lowering service cost.
Since rivals compete on price, the firm should protect cost advantage while using freshness as differentiation.
Recommend: tighten quality control at operations, review van routes and stock rotation, share demand data with retailers to match supply, and track returns by cause.

Answer: Sundaram's advantage lies in automated operations and controlled delivery. Its weak point is returns, which damage margin. By linking quality control in operations with outbound logistics and retailer service, it can reduce returns, keep its cost position and add freshness as a point of difference.

Exam tips

Draw or list the nine activities clearly in the first lines. Examiners look for correct classification first.
Always tie each activity to a fact from the case. A generic list earns fewer marks than an applied one.
If asked to compare value chain and supply chain, give a short table-like contrast in sentences: scope, focus and purpose.
End with the effect on margin and competitive advantage. Many answers stop before the conclusion.
When the case mentions outsourcing, link it to which activities the firm keeps for core strength and which it hands over.

Practice questions from Competitive Positioning

Value Chain Analysis in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Value Chain Analysis: frequently asked questions

What are the primary and support activities in Porter's value chain?

Primary activities are inbound logistics, operations, outbound logistics, marketing and sales, and service. Support activities are firm infrastructure, human resource management, technology development and procurement. Support activities serve all primary ones.

How do I do value chain analysis step by step?

Identify the business, list primary and support activities, judge each for cost and value, find linkages, decide the source of advantage and recommend actions. End by stating the effect on margin.

What is the difference between value chain and supply chain?

The value chain is an analysis of the activities inside one firm to find where value and cost arise. The supply chain is the network of firms and flows that moves goods from raw material to the final customer.

Is the value chain only for manufacturing firms?

No. Service firms also have activities that create value, though the names may change. A bank, for example, has operations, marketing and customer service, backed by technology and HR.