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Unit cost is the average cost of producing one unit of output: total production costs ÷ number of units produced. Free notes and 15 questions answered.
Efficiency, Costs and Supplier Collaboration is part of The role of procurement in GCSE AQA Business.
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GCSE AQA
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Unit cost is the average cost of producing one unit of output: total production costs ÷ number of units produced. Free notes and 15 questions answered.
Use this lesson to stay inside The role of procurement while connecting the detail back to the wider Business operations topic.
Read the core explanations from Efficiency, Costs and Supplier Collaboration before testing yourself from memory.
Every business, from a local bakery to a global manufacturer, faces the same fundamental challenge: how do you produce what customers want, at a price they will pay, while still making a profit? The answer almost always comes back to efficiency and cost control.
Think of it this way. If two bakeries both sell a loaf of bread for £2.50, but one spends £1.80 making it and the other spends £1.20, the second bakery earns nearly double the profit per loaf (profits of £0.70 versus £1.30, which is approximately an 86% increase). That gap comes entirely from how efficiently each business operates.
This lesson focuses on three connected ideas: running operations efficiently, keeping unit costs low, and working closely with suppliers to make both happen. These are not separate topics — they feed directly into each other, and AQA examiners expect you to show those connections.
Here is where it gets interesting. Fixed costs — things like rent and machinery — stay the same regardless of how much a business produces. So the more units a business makes, the more those fixed costs are spread across each item. This is why larger businesses can often undercut smaller rivals on price.
This relationship between output and unit cost is one of the most important ideas in business operations. It explains why businesses invest in automation, negotiate bulk deals with suppliers, and push to increase production volumes. Every extra unit produced chips away at the fixed cost burden per item.
Worked example: Calculating Unit Cost and Analysing the Impact of Increased Output
Mohammed's furniture workshop has total monthly costs of £24,000. In January, he produces 400 chairs. In February, he invests in a new cutting machine and produces 600 chairs, with total costs rising to £27,000. Calculate the unit cost in each month and explain what this tells Mohammed about his decision.
Answer: January unit cost: £60. February unit cost: £45. The £15 reduction in unit cost shows that increasing output spreads fixed costs more widely, improving Mohammed's profit margin from £20 to £35 per chair.
Notice what the calculation reveals: total costs went up, but the business became more profitable per unit. This is a trap examiners love to set — students see rising total costs and assume the business is worse off. Always calculate unit cost before drawing conclusions.
Procurement sits at the start of the production process. Before a business can make anything, it needs raw materials, components, or services — and how well it buys those inputs directly affects everything downstream: quality, speed, and profit margin.
Effective procurement is about value, not just price. A business that buys cheap materials and ends up with defective products, customer complaints, and costly returns has not saved money — it has wasted it. The goal is to find the combination of price, quality, and reliability that best serves the business's overall strategy.
This is why procurement teams spend significant time building relationships with suppliers, comparing quotes, and negotiating terms. A well-negotiated supplier contract can lock in lower prices, guarantee delivery schedules, and protect the business from sudden cost increases — all of which directly reduce unit costs.
The chart above shows how Priya's clothing brand reduces its fabric cost per metre by changing its procurement approach. Moving from a single supplier to a long-term partnership cuts unit cost by £2.60 per metre — a 30.6% reduction. At scale, this transforms profit margins.
This data also illustrates a key evaluative point: the lowest unit cost (bulk buying at £5.20) is not automatically the best choice. Bulk buying requires storage space, ties up cash, and carries the risk of holding excess stock. A business must weigh these trade-offs against the cost saving.
There is a traditional view of the buyer-supplier relationship as adversarial: the buyer pushes for the lowest price, the supplier pushes back. Modern businesses have largely moved away from this model because it produces short-term savings at the cost of long-term reliability.
Supplier collaboration means treating key suppliers as partners rather than vendors. When a business shares its production forecasts with a supplier, the supplier can plan its own production more efficiently — which often translates into lower prices and more consistent quality for the buyer. Both sides benefit.
Consider how Tesco works with its food suppliers. Rather than switching suppliers every year to chase the lowest price, Tesco invests in long-term relationships, sharing sales data and working jointly on packaging and logistics. This reduces waste across the supply chain and keeps shelves stocked reliably — a direct operational benefit.
Collaboration also supports waste reduction. When a business and its supplier communicate closely, they can identify inefficiencies — excess packaging, unnecessary delivery runs, overstocked components — and eliminate them together. This is the principle behind lean production: cutting every step that does not add value.
Worked example: Analyse How Supplier Collaboration Reduces Costs for a Manufacturer
Aisha runs a bicycle manufacturer. She currently orders components from three different suppliers on a short-term basis, switching regularly to get the lowest price. Her production manager reports frequent delays and quality inconsistencies. Analyse how working more closely with a single key supplier could benefit Aisha's business. [6 marks]
Method: Point-Evidence-Explain-Link (PEEL)
Answer: Committing to a long-term supplier relationship would give Aisha more reliable component deliveries, reducing costly production delays. It would also allow joint work on quality standards, cutting defect rates and the associated rework costs — both of which directly lower unit costs. However, Aisha should retain a backup supplier to protect against supply chain disruption, balancing the efficiency gains against the risk of over-dependence.
Choosing a supplier is one of the most consequential procurement decisions a business makes. Get it right and you have a reliable, cost-effective partner that supports your operations. Get it wrong and you face delays, quality failures, and reputational damage.
AQA expects you to know the key factors that influence supplier choice and — crucially — to explain why each factor matters and how it affects business performance. The factors do not exist in isolation; a business must weigh them against each other based on its specific priorities.
| Factor | What It Means | Why It Matters to the Business |
|---|---|---|
| Price | The cost charged by the supplier for goods or services | Directly affects unit costs and profit margins — lower prices improve competitiveness |
| Quality | The standard of materials or components supplied | Poor quality leads to defective products, customer complaints, and costly returns |
| Reliability | Consistency of delivery on time and in full | Late deliveries halt production, increase costs, and damage customer relationships |
| Location | Where the supplier is based (local, national, international) | Affects delivery speed, transport costs, and supply chain risk |
| Ethical Standards | Whether the supplier follows fair labour and environmental practices | Affects brand reputation and CSR commitments — important to ethically-minded consumers |
| Payment Terms | How long the business has to pay the supplier's invoice | Longer payment terms improve cash flow, giving the business more financial flexibility |
| Capacity | The supplier's ability to scale up production if demand increases | A supplier that cannot meet increased orders limits the business's ability to grow |
Notice that price is only one of seven factors. Examiners frequently reward students who demonstrate that the cheapest supplier is not always the best choice. A supplier offering 10% lower prices but delivering late 30% of the time will cost the business far more in lost production than it saves on materials.
Location is an increasingly important factor. A business sourcing components from overseas may benefit from lower prices, but faces longer lead times, higher transport costs, and greater exposure to disruption — as many UK manufacturers discovered during global supply chain crises. A local supplier may cost slightly more but offers speed and resilience.
Ethical standards have grown in significance as consumers and investors scrutinise supply chains more closely. A business that sources from a supplier using exploitative labour practices risks serious reputational damage — even if it had no direct involvement. This is why brands like Marks and Spencer publish detailed supplier codes of conduct.
Worked example: Evaluating Supplier Options Using Multiple Criteria
Ben's electronics firm needs a new supplier for circuit boards. Supplier A charges £12 per board, delivers in 3 days, and has a 2% defect rate. Supplier B charges £10 per board, delivers in 10 days, and has a 6% defect rate. Ben produces 5,000 boards per month. Evaluate which supplier offers better value.
Answer: Supplier B is cheaper on material cost (£52,400 vs £60,800 including defects), but Supplier A's faster delivery and lower defect rate offer significant operational advantages. The best choice depends on Ben's priorities: if cash flow is tight, Supplier B's lower cost may be decisive; if production reliability is critical, Supplier A's consistency justifies the higher price.
Questions on efficiency and procurement appear across all command word levels in AQA Business. A 2-mark 'define' question needs a precise definition with a key feature. A 6-mark 'analyse' question needs two developed chains of reasoning. A 12-mark 'evaluate' question needs balanced argument, evidence, and a justified conclusion.
The most common error on these questions is writing in generalities. Phrases like 'the business will save money' or 'costs will go down' score at most Level 1. You need to explain the mechanism: why does the cost go down, by how much, and what does that mean for the business's competitiveness or profitability?
When a question gives you data — a unit cost figure, a defect rate, a delivery time — you must use it. Examiners award application marks specifically for referencing the case study. A student who writes 'the unit cost of £45 per chair is lower than the industry average of £60' will always outscore one who writes 'the unit cost is low'.
Worked example: Model Answer — Evaluate Whether a Business Should Switch Suppliers to Reduce Costs
Chloe's bakery currently buys flour from a local supplier at £0.80 per kg. A national supplier has offered flour at £0.55 per kg, but requires a minimum order of 5,000 kg per month and has a 15-day delivery lead time. Chloe currently uses 2,000 kg per month. Evaluate whether Chloe should switch to the national supplier. [9 marks]
Method: Balanced Evaluation with Justified Conclusion
Answer: At current volumes of 2,000 kg per month, switching to the national supplier would increase Chloe's monthly flour spend from £1,600 to £2,750 — a £1,150 increase — because the minimum order of 5,000 kg forces her to buy stock she cannot use. This would damage her cash flow and require additional storage. However, if Chloe plans to expand production, the £0.55 per kg price offers a significant long-term saving. On balance, the switch is not advisable now, but should be reconsidered once monthly usage approaches 5,000 kg.
Published by Revise Right. Use the official specification reference to check the requirements for your course. Content updated: 2026-03-05.
Move to the related lessons or back to the topic page when you need the wider sequence before exam-style practice.
Unit cost is the average cost of producing one unit of output: total production costs ÷ number of units produced. If a factory spends £50,000 producing 10,000 units, the unit cost is £5, and spreading fixed costs across more units lowers the unit cost.
Efficiency is the ability to produce goods or services using the minimum amount of resources, such as time, labour, materials and money, without sacrificing quality. A car manufacturer producing 500 cars per day with 200 workers is more efficient than one producing 400 cars with the same workforce.
Supplier collaboration means treating key suppliers as partners rather than vendors, for example sharing production forecasts so the supplier can plan efficiently. It can lower prices, improve quality and reliability and reduce waste, as Tesco does by sharing sales data with long-term food suppliers, though relying on one supplier increases risk.
Unit costs can fall even when total costs rise, if output rises faster. A workshop spending £24,000 to make 400 chairs has a unit cost of £60; after buying a machine, £27,000 for 600 chairs gives £45 per chair, so profit per £80 chair rises from £20 to £35.
The factors affecting supplier choice are price, quality, reliability, location, ethical standards, payment terms and capacity. Price is only one of seven: a supplier offering 10% lower prices but delivering late 30% of the time will cost a business far more in lost production than it saves on materials.
Good procurement is about value, not just the lowest price. A business that buys cheap materials and ends up with defective products, customer complaints and costly returns has wasted money; the aim is the combination of price, quality and reliability that best serves the business's strategy.
Bulk buying can give the lowest unit cost, as when bulk-bought fabric falls to £5.20 a metre, but it needs storage space, ties up cash and risks holding excess stock. A business must weigh these trade-offs against the cost saving rather than assuming the cheapest unit price is best.
A long-term supplier relationship can lock in lower prices, guarantee delivery schedules and protect a business from sudden cost increases. Sharing production forecasts lets the supplier plan efficiently, improving price and quality, as Tesco does by sharing sales data with food suppliers.
Relying on one supplier increases risk, because if that supplier faces disruption, such as a strike, a fire or financial difficulty, the entire production line could halt. Keeping at least one backup supplier reduces this risk while still gaining most of the benefits of collaboration.
An overseas supplier may offer lower prices but brings longer lead times, higher transport costs and greater exposure to disruption, as many UK manufacturers found during global supply chain crises. A local supplier may cost slightly more but offers speed and resilience.
Supplier ethical standards matter because a business sourcing from a supplier using exploitative labour practices risks serious reputational damage, even without direct involvement. Consumers and investors scrutinise supply chains closely, which is why brands like Marks and Spencer publish supplier codes of conduct.
Supplier payment terms affect a business's cash flow: the longer it has to pay a supplier's invoice, the more financial flexibility it has. Payment terms are one of seven factors in choosing a supplier, alongside price, quality, reliability, location, ethical standards and capacity.
Supplier capacity matters because a supplier that cannot scale up production when demand increases limits the business's ability to grow. A business that wants to grow needs suppliers able to meet larger orders as well as offering the right price, quality and reliability.
A cheaper supplier with a minimum order can cost more if the business must buy stock it cannot use. Chloe's bakery uses 2,000 kg of flour a month at £0.80, or £1,600, but a national supplier at £0.55 needs a 5,000 kg minimum, costing £2,750, £1,150 more, and tying up cash in excess stock.
Suppliers with different defect rates are compared by adding defect costs to material costs. For 5,000 boards, Supplier A at £12 with 2% defects costs £60,800, while Supplier B at £10 with 6% defects costs £52,400; B is cheaper, but A's faster delivery and fewer defects may be worth its higher price.