Choosing suppliers | AQA A-Level Business

For Specification 7132

AQA A-Level Business | Free Revision Notes

Estimated study time: 70 minutes

Choosing the right supplier can affect far more than the price a business pays for materials or products. This Choosing suppliers A-Level Business revision page examines the factors that influence supplier choice and how supplier decisions can affect costs, quality, reliability and competitiveness. Supplier decisions are particularly important when businesses depend on frequent deliveries or operate with low levels of buffer inventory. The topic builds directly on inventory management [Inventory management] and leads into supply-chain management [Supply-chain management] and outsourcing [Outsourcing]. AQA explicitly requires students to understand the influences on the choice of suppliers.

Learning Objectives 🎯

By the end of this revision page, you should be able to:

• Explain the factors that may influence a business's choice of supplier.

• Analyse how the price charged by suppliers may affect business costs.

• Analyse how supplier quality may affect operational performance.

• Analyse why supplier reliability may be important.

• Analyse trade-offs between price, quality and reliability.

• Analyse how supplier decisions may affect the competitiveness of a business.

Revision Notes 📚

Choosing suppliers A-Level Business revision overview

AQA includes influences on the choice of suppliers within its section on managing inventory and supply chains.

AQA assessment materials identify several possible influences, including:

• price charged

• quality

• reliability

• after-sales service

• ethical issues.

There is no single factor that is always the most important.

The choice depends on:

• the nature of the business

• the industry

• the product being supplied

• customer expectations

• the business's inventory-management approach

• how the business competes.

The strongest A-Level answers therefore compare the importance of different factors rather than assuming that the cheapest or most reliable supplier must always be best.

What is a supplier?

A supplier is another business or organisation that provides goods or services required by a business.

A supplier might provide:

• raw materials

• components

• finished products for resale

• services required by the business.

Supplier performance can therefore directly affect the operations of the purchasing business.

For example:

supplier delivers late

↓

required materials are unavailable

↓

production may be interrupted

↓

customer orders may be delayed

↓

the purchasing business may appear unreliable

This is why supplier choice can affect competitiveness as well as costs.

Factors influencing the choice of suppliers

Price charged

One of the most obvious factors is the price charged by the supplier.

The amount a business pays for materials, components or goods affects its costs.

For example:

Supplier A charges £10 per component.

Supplier B charges £8 per component.

If the business buys 50,000 components:

Supplier A:

50,000×£10=£500,000

Supplier B:

50,000×£8=£400,000

Choosing Supplier B would reduce purchasing expenditure by:

£500,000−£400,000=£100,000

If everything else were equal, the cheaper supplier would therefore lower business costs.

Supplier price and unit costs

Lower supplier prices may reduce the business's unit costs.

Suppose a manufacturer has:

• other costs per unit = £30

• component cost from Supplier A = £12.

Total unit cost:

£30+£12=£42

Supplier B offers the same component for £9.

New unit cost:

£30+£9=£39

Unit cost falls by:

£42−£39=£3

The business may then have greater scope to:

• reduce its selling price

• maintain its price and increase its margin.

AQA's June 2022 supplier mark scheme explicitly recognised that choosing the cheapest supplier may allow a business to increase profit margins or reduce the final selling price.

Supplier price and competitiveness

A lower supplier price can contribute to cost competitiveness.

The chain may be:

lower supplier price

↓

lower input costs

↓

lower unit costs

↓

business can reduce selling price

↓

product becomes more price competitive

↓

demand may increase

Alternatively:

lower supplier price

↓

unit cost falls

↓

selling price maintained

↓

margin per unit increases

↓

profitability may improve

AQA's 2025 mark scheme also recognised that relationships with suppliers can be important to achieving a low-cost business model.

However, price should not be considered in isolation.

Quality of supplies

Why supplier quality matters

The quality of a business's final output can depend partly on the quality of the inputs it receives.

For example:

supplier provides poor-quality components

↓

components contain more defects

↓

business may produce defective final products

↓

wastage or customer complaints may increase

↓

unit costs may rise and reputation may suffer

AQA's June 2022 case study involved a manufacturer forced to use a new supplier whose components had higher levels of defects.

This demonstrates how supplier quality can directly create operational problems.

High-quality inputs and final quality

A supplier providing better-quality materials or components may allow a business to achieve more consistent final quality.

The possible chain is:

higher-quality supplier

↓

fewer defective inputs

↓

fewer quality problems during production

↓

less waste or reworking

↓

lower unit costs

↓

greater operational efficiency

There may also be a customer effect:

higher-quality inputs

↓

better final product

↓

greater customer satisfaction

↓

stronger reputation or repeat demand

↓

greater competitiveness

This connects directly with the value and difficulties of improving quality [The value and difficulties of improving quality].

Higher quality may cost more

The supplier offering the highest-quality materials may also charge a higher price.

Managers therefore face a trade-off:

higher supplier quality

may mean:

higher input cost

but also:

less waste + better final quality + stronger customer value

The correct decision depends on whether the additional quality is worth the higher price.

Quality may be especially important for differentiated businesses

A business competing through premium quality may place greater importance on the quality of its suppliers.

For example:

premium final product

↓

customers expect high quality

↓

poor-quality inputs could undermine the product

↓

supplier quality becomes a major selection factor

AQA's 2022 examiner report specifically noted that stronger students recognised that quality might be most important for businesses producing at the luxury end of the market.

For such a business, choosing the cheapest supplier could be a false economy if lower-quality inputs damage the basis on which the business competes.

Reliability

What is supplier reliability?

A reliable supplier provides what the business requires when it is expected.

Reliability can therefore involve consistently meeting agreed supply requirements.

AQA has examined reliability directly and in detail. Its June 2022 Paper 2 asked students to assess whether reliability is the most important factor in supplier choice for all businesses.

Why reliability matters

If a supplier fails to deliver when expected:

delivery delayed

↓

business lacks required materials or products

↓

production or sales may be interrupted

↓

customer orders may not be fulfilled

↓

customers may regard the business itself as unreliable

↓

competitiveness may fall

AQA's June 2022 mark scheme explicitly identifies both:

• potential interruptions to production

• the knock-on effect of making the purchasing business appear unreliable to its customers.

Reliability and customer service

Customers deal with the final business, not necessarily its supplier.

If a supplier is late, customers may still blame the business from which they purchased.

For example:

supplier fails to deliver component

↓

manufacturer cannot complete product

↓

customer receives order late

↓

customer dissatisfaction rises

↓

customer may switch to a competitor

Therefore, a supplier's reliability can become part of the purchasing business's own reputation.

Reliability and Just in Time

Supplier reliability is particularly important for businesses using Just in Time (JIT) operations.

JIT aims to minimise inventory holdings while ensuring inventory is available when required.

If the business holds little buffer inventory:

supplier delivers late

↓

little spare inventory is available

↓

business runs out more quickly

↓

production or sales may stop

This makes supplier reliability particularly important.

AQA's June 2022 mark scheme explicitly identifies reliable suppliers as important where businesses want to maintain low buffer inventory or operate JIT systems.

This links directly with lean production [Lean production] and inventory management [Inventory management].

Reliability and buffer inventory

A business can partly protect itself from an unreliable supplier by holding more buffer inventory.

AQA's June 2022 mark scheme explicitly recognised this trade-off.

For example:

supplier less reliable

↓

business holds larger buffer inventory

↓

more stock is available if delivery is delayed

↓

risk of production stopping falls

But:

larger buffer inventory

↓

more cash tied up

↓

higher storage costs

↓

potentially greater wastage

The supplier decision therefore affects inventory-management decisions as well.

Price versus reliability

A cheap supplier is not automatically the lowest-cost supplier overall.

Consider:

	Supplier A	Supplier B
Component price	£8	£9
On-time deliveries	88%	99%

Supplier A is cheaper.

However, if its late deliveries frequently interrupt production, the apparent £1 saving may be outweighed by:

• lost output

• delayed customer orders

• additional inventory requirements

• lost sales.

The relevant question is not simply:

Which supplier charges the lowest price?

It is:

Which supplier provides the best overall outcome for the business?

A cheaper but unreliable supplier

A possible analysis is:

lower price charged

↓

input costs fall

↓

unit costs may fall

↓

business becomes more price competitive

but:

unreliable deliveries

↓

production disruption

↓

customer orders delayed

↓

customer satisfaction falls

↓

competitiveness may deteriorate

Managers need to judge which effect is likely to be greater.

Quality versus price

A similar trade-off exists between quality and cost.

Supplier A:

• £7 per component

• 8% defective.

Supplier B:

• £9 per component

• 1% defective.

Supplier A appears cheaper.

However, the business may face:

• greater wastage

• additional inspection

• lower-quality final output

• customer complaints.

A higher-priced supplier can therefore produce a lower overall operational cost if the quality difference is sufficiently important.

📌 Exam point: Do not treat supplier price and total business cost as the same thing.

Reliability versus quality

A highly reliable supplier may consistently deliver goods that are lower quality.

A high-quality supplier may occasionally deliver late.

Which is preferable depends on the business.

Reliability may dominate where:

• production cannot continue without the input

• buffer inventory is very low

• the business uses JIT

• customers expect rapid delivery.

Quality may dominate where:

• final product quality is central to competitiveness

• defective inputs would be particularly costly

• customers pay premium prices for quality.

AQA's examiner report specifically praised answers that recognised different situations in which reliability, price or quality would be most important.

After-sales service from suppliers

AQA's June 2022 mark scheme also identifies after-sales service as a possible influence on supplier choice.

After-sales service concerns the support available after the business has purchased from the supplier.

Its importance depends on what is being supplied.

For some purchases, the business may value a supplier that provides effective support if problems occur.

The key analytical principle is:

better supplier support

↓

problems may be resolved more effectively

↓

operational disruption may be reduced

↓

business performance may improve

However, after-sales service may be much less important for some routine purchases.

Ethical issues

AQA's June 2022 supplier mark scheme also recognises ethical issues as a factor influencing supplier choice.

AQA's operations specification also requires students to consider ethical and environmental influences throughout operational management.

A business may therefore consider whether a supplier's activities are compatible with its own ethical objectives.

The possible reasoning is:

supplier behaviour conflicts with business's ethical priorities

↓

continuing relationship may conflict with operational or wider business objectives

↓

business may choose another supplier

The significance depends on:

• the objectives of the business

• customer expectations

• the cost and availability of alternatives.

Avoid introducing external ethical frameworks that are not required by the specification.

Supplier choice and business objectives

Different businesses may choose different suppliers because their operational objectives [Operational objectives] differ.

Cost objective

A business prioritising cost may place greater emphasis on supplier price.

Quality objective

A business competing through quality may prioritise the standard of inputs.

Speed of response

A supplier that delivers reliably and promptly may help the business respond more effectively to customers.

Flexibility

A supplier able to respond to changing requirements may support the business's wider operational flexibility.

The correct supplier therefore depends partly on what the business is trying to achieve.

Supplier choice and inventory management

Supplier choice can directly affect the amount of inventory a business needs to hold.

This is a crucial link with inventory management [Inventory management].

Reliable supplier

deliveries arrive when expected

↓

business may hold lower buffer inventory

↓

less cash tied up

↓

lower storage costs

↓

efficiency may improve

Unreliable supplier

deliveries may be late

↓

business may need a larger buffer

↓

average inventory holdings rise

↓

inventory costs rise

AQA explicitly recognises this relationship when evaluating supplier reliability.

Supplier choice and lead time

The time taken for inventory to arrive after an order is placed affects inventory-management decisions.

A supplier whose deliveries consistently take longer may require the business to order earlier or hold greater inventories while waiting.

The important relationship is:

longer wait for supply

↓

greater need to plan inventory availability during the waiting period

↓

potentially greater inventory requirements

This is why supplier performance and inventory control should not be analysed as completely separate topics.

Supplier choice and Just in Time

A business operating JIT has less protective inventory.

Supplier performance therefore becomes particularly important.

AQA's examiner report identified JIT manufacturers as a strong example of businesses for which reliability might be the most important supplier factor.

The chain is:

JIT → low buffer inventory → greater dependence on delivery timing → reliable supplier becomes more important

If a business deliberately holds a large buffer, reliability may be less critical because it has more protection.

This is a strong evaluation point.

Supplier choice and quality management

The quality of inputs can affect the amount of poor-quality output produced.

For example:

poor-quality components

↓

more production defects

↓

more output rejected

↓

greater wastage

↓

higher unit costs

This means supplier choice can influence the success of the quality decisions studied in quality control and quality assurance [Quality control and quality assurance].

A business cannot always compensate for consistently poor-quality materials simply by inspecting its own finished output.

Supplier choice and operational efficiency

Supplier decisions can affect efficiency through several routes.

Price route

lower supplier price → lower input costs → potentially lower unit costs

Quality route

better inputs → fewer defects → less wastage → potentially lower unit costs

Reliability route

reliable delivery → fewer disruptions → productive resources continue operating → efficiency protected

The cheapest supplier therefore does not automatically provide the greatest operational efficiency.

Supplier choice and competitiveness

AQA's examiner reports make it clear that students should develop supplier arguments through to competitiveness, not stop at the immediate operational consequence.

There are several possible chains.

Cost competitiveness

lower supplier prices

↓

lower input costs

↓

lower unit costs

↓

lower selling price possible

↓

greater price competitiveness

Quality competitiveness

higher-quality supplies

↓

higher-quality final output or fewer defects

↓

greater customer satisfaction

↓

stronger reputation or differentiation

↓

greater competitiveness

Reliability competitiveness

supplier consistently delivers as required

↓

business avoids production disruption

↓

customer orders fulfilled on time

↓

business itself appears reliable

↓

customer satisfaction and competitiveness improve

This final connection was a major discriminator in AQA's June 2022 assessment.

The cost of supplier failure

A supplier failure can have consequences far beyond the purchase price.

AQA's 2022 DT case provides a useful example.

A vital component supplier closed suddenly. DT:

• could not find alternatives quickly enough to fulfil all existing orders

• had to use a more expensive new supplier

• received supplies with higher levels of defects.

This demonstrates three different supplier consequences at once:

Reliability problem

Orders could not all be fulfilled.

Cost problem

Replacement supplies were more expensive.

Quality problem

Replacement supplies contained more defects.

The result illustrates why supplier choice is a strategic operational decision rather than a simple purchasing exercise.

Supplier decisions and customer expectations

The most important supplier factor depends partly on what the final customer values.

AQA's supplier mark scheme explicitly identifies final customer expectations as relevant to the judgement.

Customers value low price

Supplier cost may be particularly important.

Customers value premium quality

Supplier quality may be more important.

Customers value rapid, dependable delivery

Supplier reliability may dominate.

A business should therefore choose suppliers that support the value proposition offered to its own customers.

Supplier decisions and the type of business

AQA also identifies the nature of the business and industry as important.

This explains why supplier priorities differ.

JIT manufacturer

Reliability may be crucial because little buffer inventory is held.

Premium producer

Quality may be crucial because poor inputs undermine the premium product.

Low-cost producer

Price may be particularly important because keeping unit costs low supports the competitive strategy.

AQA's 2022 examiner report highlighted these exact distinctions as features of stronger responses.

Supplier choice and competitors

Supplier decisions should also be considered relative to competitors.

If competitors obtain:

• lower-cost inputs

• better-quality components

• more reliable supply,

the business may be placed at a competitive disadvantage.

For example:

Business A pays £5 per component

while:

competitors pay £4

If all other factors are equal:

Business A has higher unit costs

↓

less scope to compete on price

or:

lower profit margin at the same selling price

Supplier relationships can therefore influence relative competitiveness.

The lowest-price supplier is not always best

This is one of the most important evaluative principles.

A low purchase price is valuable only if the supplier also performs adequately on the factors that matter.

Suppose:

Factor	Supplier A	Supplier B
Price per unit	£5.00	£5.60
Defect rate	8%	1%
On-time deliveries	82%	98%

Supplier A is cheaper by £0.60 per unit.

But it also has:

• a much higher defect rate

• much lower delivery reliability.

A business needs to assess whether the direct price saving compensates for the operational difficulties created by lower quality and reliability.

The most reliable supplier is not always best

AQA's June 2022 question asked directly whether reliability was the most important factor for all businesses.

The mark scheme rejects a universal answer.

Reliability may not be most important where:

• the business can maintain a larger buffer

• another supplier provides much lower prices

• another supplier provides substantially higher quality.

The issue is therefore relative importance.

A more expensive supplier can still improve profit

Suppose:

Supplier A costs £8 per component but 10% of its components are unusable.

Supplier B costs £9 but only 1% are unusable.

The higher purchase price of Supplier B does not automatically mean lower profit.

If better quality:

• reduces wastage

• reduces production problems

• increases final quality,

the overall business benefit may exceed the extra £1 purchase cost.

The strongest answer therefore considers total business consequences, not supplier price alone.

Supplier choice and buffer inventory

A business can partly trade supplier reliability against inventory cost.

Option A: reliable supplier

• higher supplier price

• lower buffer inventory may be possible.

Option B: less reliable supplier

• lower supplier price

• larger buffer inventory required.

The manager should compare:

extra price of reliable supplier

against:

extra inventory cost and disruption risk associated with unreliable supplier.

This is a strong example of why operational decisions are interrelated.

Supplier choice and cash flow

Supplier decisions can indirectly affect cash flow through inventory.

If a reliable supplier enables a business to hold less buffer inventory:

lower inventory

↓

less cash tied up

↓

cash-flow position may improve

However, if the reliable supplier charges substantially more, cash outflows for purchases may rise.

Managers should therefore consider the combined effects.

This connection becomes more important in cash flow and profit [Cash flow and profit].

Supplier choice and supply-chain management

Individual supplier decisions form part of the wider supply chain.

The next lesson, supply-chain management [Supply-chain management], examines how the supply chain can be managed effectively and efficiently and the value of doing so.

For this lesson, the key point is:

The performance of suppliers affects the ability of the business to manage its operations effectively.

A strong supplier relationship can support:

• cost control

• quality

• reliability.

A poor supplier can create problems throughout the operation.

Supplier choice and outsourcing

When a business outsources an activity, it becomes dependent on another organisation to carry out something previously or potentially done internally.

Supplier-type considerations therefore become relevant:

• cost

• quality

• reliability.

These issues are explored further in outsourcing [Outsourcing].

The key connection is that using an external organisation creates benefits only if the external provider performs sufficiently well.

Ethical considerations and competitiveness

An ethical supplier may sometimes cost more.

Whether the business chooses that supplier may depend on its objectives and customers.

For example:

more ethically appropriate supplier

↓

higher input cost

↓

unit costs may rise

but potentially:

supplier choice aligns with business objectives and customer expectations

↓

competitive position may be supported

The relative importance depends on the context.

AQA explicitly includes ethical issues among possible supplier-choice factors, so they can be used where relevant rather than added generically to every answer.

Choosing a supplier using several pieces of data

Suppose a manufacturer is considering three suppliers.

Factor	Supplier A	Supplier B	Supplier C
Price per component	£6.00	£6.40	£7.00
Defective components	7%	2%	1%
Deliveries on time	85%	96%	99%

There is no automatic answer.

Supplier A

• cheapest

• lowest reliability

• highest defect rate.

Could suit a business heavily focused on purchase price and able to cope with defects and delays, although the apparent saving may disappear once wider costs are included.

Supplier B

• mid-range price

• relatively strong quality

• relatively strong reliability.

Could provide a balance.

Supplier C

• highest price

• highest quality

• highest reliability.

Could suit a business where defects or supply disruption are particularly costly.

The correct choice depends on the business's objectives and context.

Quantifying supplier price differences

AQA may provide numerical data that can strengthen supplier analysis.

Suppose a business buys 100,000 components.

Supplier A:

100,000×£5.50=£550,000

Supplier B:

100,000×£6.10=£610,000

Difference:

£610,000−£550,000=£60,000

Supplier B costs £60,000 more.

A strong answer then asks:

Are Supplier B's quality or reliability advantages worth at least the business impact of the additional £60,000 cost?

The calculation supports the decision. It does not make the decision automatically.

Quantifying defect rates

Suppose the same suppliers have:

• Supplier A defect rate = 6%

• Supplier B defect rate = 1%.

For 100,000 components:

Supplier A defective components:

100,000×0.06=6,000

Supplier B defective components:

100,000×0.01=1,000

Difference:

6,000−1,000=5,000

Supplier B provides 5,000 fewer defective components.

Managers can now compare:

• £60,000 additional purchase cost

• 5,000 fewer defects

• any reliability difference.

This produces far stronger analysis than simply saying Supplier B has better quality.

Evaluating supplier reliability

Reliability is likely to be especially important when:

• the business uses JIT

• buffer inventory is low

• production depends on a vital component

• late customer delivery would be particularly damaging

• alternative suppliers cannot be found quickly.

It may be relatively less important when:

• the business maintains large buffer inventories

• supply delays have little immediate effect

• price or quality is much more important to customer value.

This directly reflects the reasoning rewarded by AQA in 2022.

Evaluating supplier quality

Quality is likely to be especially important when:

• the final product is positioned as premium

• defective inputs create significant waste

• customer expectations are high

• poor quality would damage the firm's differentiation.

Price may matter more if:

• customers strongly prioritise low prices

• quality differences between suppliers are small

• inputs are highly standardised.

Again, judgement depends on context.

Evaluating supplier price

Price is likely to be especially important when:

• input costs are a large proportion of total costs

• the market is highly price competitive

• customers are price sensitive

• suppliers offer similar quality and reliability.

Price may matter less if:

• a cheap supplier creates frequent production interruptions

• defect rates are high

• poor quality damages a premium final product.

The best supplier is therefore the one whose overall performance supports the business's objectives.

Building a cost analysis chain

A weak answer:

The cheapest supplier lowers costs.

A stronger chain:

supplier charges £2 less per component

↓

business purchases 100,000 components

↓

annual purchasing costs fall by £200,000

↓

unit costs fall

↓

business can reduce selling prices

↓

price competitiveness may improve

The numerical context makes the analysis stronger.

Building a quality analysis chain

supplier provides fewer defective components

↓

less poor-quality input enters production

↓

fewer defective final products are produced

↓

wastage falls

↓

unit costs may fall

↓

quality and cost competitiveness may both improve

This shows that supplier quality can affect more than customer perceptions.

Building a reliability analysis chain

supplier consistently delivers on time

↓

business receives materials when required

↓

production is less likely to be interrupted

↓

customer orders can be completed on schedule

↓

business develops a reputation for reliability

↓

competitiveness may improve

This is the type of developed connection the 2022 examiner report said stronger students achieved.

Building a counterargument

Suppose a question argues that reliability is always most important.

A counterargument could be:

premium manufacturer sells on superior quality

↓

customers are willing to pay more because of product quality

↓

supplier quality has a direct effect on final output

↓

choosing a slightly less reliable but much higher-quality supplier may better protect differentiation

↓

larger buffer inventory could partly reduce the reliability risk

This creates a balanced evaluation rather than simply listing price, quality and reliability.

A method for choosing between suppliers

Step 1: Identify how the business competes

Does it emphasise:

• low cost

• quality

• reliable or fast service?

Step 2: Examine supplier price

Calculate the financial difference where data are supplied.

Step 3: Examine quality

Consider:

• defects

• final product quality

• wastage.

Step 4: Examine reliability

Consider:

• delivery performance

• production interruption

• inventory requirements.

Step 5: Consider inventory management

Does the business:

• use JIT

• hold substantial buffer inventory?

Step 6: Consider customer expectations

What matters most to customers?

Step 7: Make a judgement

Identify which supplier factor has the greatest overall effect on competitiveness in this context.

Key Words 🔑

Key word	Student-friendly definition	How it may be used in an exam
Supplier	A business or organisation that provides goods or services required by another business.	Analyse how the performance of an external provider affects operations.
Reliability	The extent to which a supplier consistently provides what is required when expected.	Analyse the effect of delayed supplies on production, inventory and customers.
Supplier quality	The standard of the goods or services provided by a supplier.	Explain how input quality may affect defects, wastage and final product quality.
Supplier price	The amount charged by a supplier for the goods or services provided.	Analyse the effect on input costs, unit costs, prices and profit margins.
Buffer inventory	Inventory held to provide protection against uncertainty such as supply delays.	Evaluate whether a less reliable supplier can be managed by holding additional inventory.

Hints from the Examiner Reports 💡

Examiner hint: Do not automatically state that reliability is always the most important supplier factor. In 2022, stronger responses identified different contexts where reliability, price or quality could become the priority.

Examiner hint: Use the business model to drive your judgement. The 2022 report highlighted JIT manufacturers as businesses where reliability may dominate, businesses seeking cost leadership where price may matter more, and luxury producers where quality may be particularly important.

Examiner hint: Develop the argument through to competitiveness. In the 2022 Paper 2, many students made a relevant link, but stronger responses followed the reasoning fully through to its competitive consequence.

Examiner hint: Depth matters more than producing a long list. The 2022 report found that some students raised many supplier factors but developed none of them sufficiently, which also made final evaluation difficult.

Examiner hint: Your final judgement should emerge from the analysis already developed. AQA's mark scheme expects the conclusion to depend on factors such as the business, industry, product, customer expectations and inventory-management approach.

Common Mistakes ⚠️

Mistake: Assuming the cheapest supplier is automatically best

Why this is incorrect: A lower purchase price may be outweighed by poor quality, unreliable deliveries or other costs.

How to improve: Compare the total operational consequence of the supplier, not just the quoted price.

Mistake: Assuming supplier price and total business cost are the same thing

Why this is incorrect: A cheap supplier may cause:

• more defects

• wastage

• production disruption

• additional buffer inventory.

These can increase wider costs.

How to improve: Ask:

What happens to unit costs after all the supplier's effects are considered?

Mistake: Saying reliability only matters to the supplier

Why this is incorrect: Supplier unreliability can make the purchasing business appear unreliable to its own customers.

AQA explicitly recognises this knock-on effect.

How to improve: Develop:

supplier delay → business delay → customer dissatisfaction → competitiveness.

Mistake: Assuming reliability is always the most important factor

Why this is incorrect: AQA's 2022 mark scheme specifically expects students to consider situations where price or quality may be more important.

How to improve: Use the business context to decide which factor matters most.

Mistake: Discussing reliability without inventory management

Why this is incorrect: The impact of an unreliable supplier depends partly on the amount of buffer inventory held.

How to improve: Consider:

low buffer/JIT → reliability becomes more important

whereas:

larger buffer → some protection from delays.

Mistake: Assuming high-quality suppliers only affect the final product

Why this is incorrect: Better inputs may also reduce defects and wastage during production.

How to improve: Analyse both:

• customer quality

• operational cost consequences.

Mistake: Listing price, quality and reliability with no judgement

Why this is incorrect: This shows knowledge but not evaluation.

How to improve: Ask:

Which factor matters most for this particular business, and why?

Mistake: Stopping at an immediate operational effect

Why this is incorrect: "The supplier is reliable so production continues" is incomplete for a competitiveness question.

How to improve: Continue:

production continues → orders fulfilled on time → customers satisfied → business retains demand → competitiveness improves.

This was an issue identified by the 2022 examiner report.

Exam-Style Questions ✍️

Question 1

Which one of the following is most likely to make supplier reliability particularly important?

A. The business holds very high levels of buffer inventory

B. The business operates a Just in Time system

C. Customers do not care when products arrive

D. The business has very low fixed costs

[1 mark]

Answer: B.

Question 2

Explain one reason why the price charged may influence a business's choice of supplier.

[3 marks]

Indicative answer:

A lower supplier price can reduce the cost of materials or components purchased by the business. This may reduce unit costs, giving the business greater scope to lower its selling price or increase its profit margin.

Question 3

Explain one reason why supplier reliability may be important to a manufacturer.

[4 marks]

Indicative answer:

If a supplier does not deliver a required component on time, the manufacturer may be unable to continue production. Customer orders could then be delayed, making the manufacturer appear unreliable and potentially causing customers to buy from competitors.

Question 4

A business purchases 80,000 components each year.

Supplier A charges £7.20 per component.

Supplier B charges £6.50 per component.

Calculate the annual purchasing-cost saving if the business changes from Supplier A to Supplier B.

[3 marks]

Answer:

Supplier A:

80,000×£7.20=£576,000

Supplier B:

80,000×£6.50=£520,000

Saving:

£576,000−£520,000=£56,000

Answer: £56,000 per year

Question 5

PureLuxury Ltd manufactures premium products.

Supplier X charges 10% more than Supplier Y, but its materials have a much lower defect rate.

Analyse one reason why PureLuxury Ltd might choose Supplier X.

[9 marks]

Indicative content:

• PureLuxury sells premium products.

• Customers are therefore likely to expect a high standard of quality.

• Supplier X provides materials with fewer defects.

• Better inputs may reduce the number of defective final products.

• Wastage may fall.

• More consistent final quality may strengthen PureLuxury's premium positioning.

• Customers may continue to perceive greater value in its products.

• This could support higher prices and competitiveness.

• The benefit may therefore outweigh the 10% higher supplier price.

Mark guidance:

Higher-level responses should develop the supplier-quality decision through to PureLuxury's competitive position.

Question 6

FastFlow Ltd operates a Just in Time inventory system.

Its current supplier:

• delivers 99% of orders on time

• charges £12 per component.

A new supplier:

• delivers 88% of orders on time

• charges £10 per component.

Analyse one risk to FastFlow Ltd of changing to the cheaper supplier.

[9 marks]

Indicative content:

• The new supplier saves £2 per component.

• However, on-time delivery falls from 99% to 88%.

• FastFlow operates JIT and therefore holds relatively little additional inventory.

• Late deliveries could quickly leave the business without required components.

• Production may be interrupted.

• Customer orders may then be delayed.

• Customers may view FastFlow itself as unreliable.

• Lost sales or reputational damage could outweigh the £2 saving.

• FastFlow could hold a larger buffer, but this would reduce some of the cost advantages of JIT.

Question 7

EcoHome Ltd is choosing between two suppliers.

Factor	Supplier A	Supplier B
Price per unit	£18	£21
Defect rate	5%	1%
On-time deliveries	90%	98%

EcoHome purchases 40,000 units per year.

Analyse whether the data support choosing Supplier B.

[9 marks]

Relevant calculations:

Annual cost using Supplier A:

40,000×£18=£720,000

Annual cost using Supplier B:

40,000×£21=£840,000

Supplier B costs:

£840,000−£720,000=£120,000

more each year.

Expected defective units from Supplier A:

40,000×0.05=2,000

Expected defective units from Supplier B:

40,000×0.01=400

Supplier B would provide:

2,000−400=1,600

fewer defective units.

Indicative analysis:

• Supplier B costs £120,000 more annually.

• It has a much lower defect rate, potentially reducing defects by around 1,600 units based on these figures.

• Less defective input may reduce wastage and improve final product quality.

• Its 98% delivery performance is also stronger than Supplier A's 90%.

• This may reduce production disruption and allow EcoHome to operate with less protective inventory.

• However, the quality and reliability benefits must be sufficiently valuable to justify the additional £120,000 annual purchasing cost.

Question 8

BudgetBox Ltd competes mainly by offering low-priced products.

Managers are choosing between:

Supplier A

• lowest price

• acceptable quality

• 95% of deliveries on time.

Supplier B

• 12% higher price

• superior quality

• 99% of deliveries on time.

Customers are highly price sensitive and BudgetBox currently holds a substantial level of buffer inventory.

Assess which supplier BudgetBox Ltd should choose.

[16 marks]

Arguments supporting Supplier A may include:

• BudgetBox competes mainly on price.

• Customers are highly price sensitive.

• Lower supplier prices may reduce unit costs.

• Lower unit costs could allow BudgetBox to maintain lower selling prices.

• This directly supports its basis of competition.

• Quality is described as acceptable, so the superior quality of Supplier B may provide limited additional customer value.

• BudgetBox already holds substantial buffer inventory, giving it some protection against Supplier A's slightly lower reliability.

Arguments supporting Supplier B may include:

• On-time delivery is higher at 99% rather than 95%.

• More reliable supply may reduce the risk of operational disruption.

• Superior quality may reduce defects and wastage.

• Lower wastage could offset part of the 12% price premium.

• Better reliability might eventually allow BudgetBox to reduce buffer inventory and the costs associated with holding it.

Evaluation:

Supplier A may be more appropriate because BudgetBox competes through low prices, its customers are highly price sensitive and the business already has buffer inventory to reduce the impact of some delivery delays.

However, the decision depends on how costly Supplier A's lower quality and 95% reliability actually are. If these create substantial wastage or lost sales, Supplier B's higher price could be justified.

On the information given, Supplier A is likely to fit BudgetBox's competitive strategy more closely provided its quality remains acceptable and supply problems do not create costs greater than the saving in purchase price.

Question 9

PremiumTech Ltd produces high-value products and operates with very low buffer inventory.

It is choosing between:

Factor	Supplier C	Supplier D
Price per component	£42	£47
Defect rate	4%	0.5%
On-time deliveries	91%	99.5%

Assess whether PremiumTech Ltd should choose Supplier D.

[16 marks]

Arguments supporting Supplier D may include:

• PremiumTech sells high-value products, so input quality may be particularly important.

• Supplier D's defect rate is only 0.5%, compared with 4%.

• This may reduce wastage and support more consistent final quality.

• PremiumTech holds very low buffer inventory, so reliability is particularly important.

• Supplier D delivers 99.5% of orders on time compared with 91%.

• Fewer delayed supplies should reduce the risk of production interruption.

• Customers may receive orders more reliably.

• Quality and reliability may therefore strengthen PremiumTech's competitiveness.

Arguments supporting Supplier C may include:

• Supplier D costs £5 more per component.

• If PremiumTech buys very large quantities, this could represent a substantial additional cost.

• Higher input costs could increase unit costs and reduce margins.

• PremiumTech might mitigate Supplier C's lower reliability by holding additional buffer inventory.

Evaluation:

Supplier D is likely to be the stronger choice because both the nature of PremiumTech's product and its low-buffer inventory system make quality and reliability especially important.

The £5 additional cost matters, but the decision should depend on whether avoiding defects and interruptions creates more than £5 of value per component through lower waste, reliable production and stronger customer satisfaction.

Question 10

"Reliability is the most important factor for all businesses when choosing a supplier."

To what extent do you agree?

[16 marks]

Indicative content:

Arguments supporting reliability:

• Late supplies may interrupt production.

• Customer orders may then be delayed.

• The purchasing business may appear unreliable to customers.

• Reliability is particularly important for JIT businesses with low buffer inventory.

• Reliable suppliers may allow lower buffer inventory.

• Lower inventory may reduce storage costs and cash tied up.

Arguments challenging the statement:

• Price may be more important for a business pursuing a low-cost position.

• A cheaper supplier may reduce unit costs and support lower prices or higher margins.

• Quality may be more important for a premium producer.

• Higher-quality inputs may reduce defects and wastage.

• A business can partly compensate for lower reliability by holding a larger buffer.

• After-sales service and ethical issues may also influence supplier choice.

Evaluation:

Reliability is likely to be the dominant factor where supply disruption would immediately interrupt operations, particularly for businesses using JIT or holding little buffer inventory.

However, it is not universally the most important factor. A low-cost business may rationally prioritise price if supplier quality and reliability remain adequate, while a premium producer may prioritise quality because this supports the reason customers buy its products.

A strong conclusion should therefore depend on:

• the nature of the business

• its competitive strategy

• customer expectations

• inventory arrangements

• the size of the differences between suppliers.

AQA's own mark scheme makes clear that there is no universal supplier factor that must always dominate.