Component 1: Operations management – Purchasing — Eduqas A-Level Business
Test yourself on Component 1: Operations management – Purchasing with EDUQAS A-Level practice questions.
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Component 1: Operations management – Purchasing explained
Purchasing is buying inputs at the right quality, price, quantity, place and time, and in a manufacturer or a retailer bought-in materials are usually the single largest cost, so a small percentage saving moves gross margin more than most marketing decisions.
Read the full explanation
Supplier choice is judged on price, quality, capacity, reliability of lead time, flexibility, payment terms and ethics, and the payment terms feed straight into cash flow through creditor days, calculated as payables divided by cost of sales multiplied by three hundred and sixty five. The trade-offs are real: single sourcing wins discounts and closer partnership but concentrates risk, while multiple sourcing spreads risk and costs more per unit. Porter's five forces frames this as supplier bargaining power, though it treats the relationship as a fixed contest and is blind to partnerships in which both sides invest.
Explain what is meant by stock control
This is the deliberate management of the level and flow of inventory across raw materials, work in progress and finished goods, so that production and selling never stop while as little cash as possible sits on a shelf. In practice it means setting a re-order level, a re-order quantity, a buffer and a maximum, then reviewing them as demand and lead times change. The number that measures it is inventory turnover, cost of sales divided by average inventory, expressed as times per year, or inventory days, average inventory divided by cost of sales multiplied by three hundred and sixty five. A fresh food retailer might turn stock over more than twenty times a year while a jeweller turns it three or four times, so a value only means something against the sector and the firm's own trend.
Understand the importance of controlling stock
Inventory is cash in a different shape, so every extra pallet in the warehouse is money that cannot pay wages, reduce an overdraft or fund new equipment. Holding costs include storage, insurance, security, handling, shrinkage and obsolescence, and in fashion or consumer electronics obsolescence alone can destroy the value of goods within a season. Running too lean has its own price: a stock-out halts a production line, forces expensive express freight or overtime, and sends a customer to a rival who may not come back. Control therefore sits inside liquidity, since the acid test ratio, current assets minus inventory divided by current liabilities, deliberately strips inventory out because it is the current asset least certain to turn into cash quickly. The right level depends on demand predictability, supplier reliability and perishability.
Explain methods of stock control including traditional stock control methods, just-in-time and computerised stock control
Three approaches, and the choice is a risk decision rather than a technical one. The traditional just-in-case approach sets a buffer and a fixed re-order level, often with an economic order quantity that balances ordering cost against holding cost; it protects output and wins bulk discounts but ties up cash. Just-in-time, developed at Toyota, has materials arrive as production needs them, cutting holding costs and exposing waste, but it demands reliable suppliers, short lead times and good forecasting, and it breaks badly under shock, as the semiconductor shortage and port delays of recent years showed. Computerised systems using barcodes, electronic point of sale data, radio frequency tags and planning software give real-time levels and automatic re-ordering, but cost money to install, need training, and only work if the recorded data matches what is physically on the shelf.
Interpret stock control diagrams and explain the main components including re-order level, lead time, buffer stock and minimum stock level
The chart plots inventory on the vertical axis against time on the horizontal axis and gives a sawtooth: stock falls at the usage rate, which is the gradient of the sloping line, then jumps vertically when a delivery lands. The horizontal distance between placing an order and receiving it is the lead time, the floor the firm refuses to go below is the buffer or minimum level, and the re-order level is set high enough to cover usage during the lead time plus that buffer. So re-order level equals usage rate multiplied by lead time, plus buffer stock, and the re-order quantity is maximum level minus buffer. A bakery using two hundred kilograms of flour a day with a lead time of four days and a buffer of three hundred kilograms re-orders at eleven hundred kilograms.
Evaluate the importance and impact on businesses and their stakeholders of holding too much or too little stock
Both errors cost money, in different currencies, and a good answer prices each one. Excess inventory drains cash, fills space, attracts insurance and security costs, risks theft and damage, and in technology or fashion loses value outright as newer models arrive, while also hiding poor forecasting and slow production. Shortage costs appear as lost sales, idle staff and machines, express freight, overtime, contract penalties and customers who switch and stay switched; car makers idled assembly lines for months during the semiconductor shortage. Customers, employees, suppliers, shareholders and the bank all feel it differently, so judgement turns on stated criteria: how perishable the product is, how predictable demand is, how dependable suppliers are, and whether the firm has the cash to absorb an error in either direction.
Your focus
- Explain the importance of purchasing and working with suppliers
- Explain what is meant by stock control
- Understand the importance of controlling stock
Show all 6 objectives
- Explain methods of stock control including traditional stock control methods, just-in-time and computerised stock control
- Interpret stock control diagrams and explain the main components including re-order level, lead time, buffer stock and minimum stock level
- Evaluate the importance and impact on businesses and their stakeholders of holding too much or too little stock
Component 1: Operations management – Purchasing exam tips
Marking Points
- States that purchasing balances quality, cost, quantity, delivery timing and reliability, and shows why the balance differs for a perishable food producer and a specialist engineering firm
- Links purchasing to a financial consequence, such as gross margin, unit cost, creditor days or the working capital cycle, rather than leaving it as an operations point
- Weighs single sourcing against multiple sourcing, naming the discount and partnership gain on one side and the concentration of risk on the other
- Applies supplier bargaining power from Porter's five forces to the named business, for example few suppliers of a scarce component giving them power to raise prices
- Recognises the ethical and reputational dimension of supplier relations, including payment terms for small suppliers and audited labour standards in the supply chain
- Identifies the three categories of inventory, raw materials, work in progress and finished goods, and notes that each is held for a different reason
- States the purpose as balancing continuity of supply and customer service against the cash and cost tied up in holding inventory
- Names and uses a measure correctly, inventory turnover in times per year or inventory days, and interprets the figure against the sector or against last year
- Refers to the control parameters that are actually set, re-order level, re-order quantity, buffer stock and maximum stock level, rather than describing stock in general terms
- Explains inventory as tied-up working capital and gives at least two named holding costs such as storage, insurance, shrinkage or obsolescence
- Explains the cost of holding too little, including lost sales, idle labour and machinery, emergency delivery charges and damaged customer goodwill
- Links inventory levels to a liquidity measure, current ratio or acid test ratio, and explains why the acid test excludes inventory
- Applies the argument to the named firm's context, for example perishability for a food producer or seasonal demand for a garden centre
- Describes the traditional approach with its named parameters, buffer stock, re-order level and re-order quantity, and notes bulk discount and continuity as its benefits
- Explains just-in-time as materials arriving as needed, and links it to reduced holding costs and released working capital while naming its dependence on supplier reliability and short lead times
- Explains what computerised control adds, real-time stock data, automatic re-ordering and better demand forecasting, and prices in the installation and training cost
- Compares the methods against the firm's circumstances rather than declaring one universally superior, for example supplier proximity, demand volatility and product shelf life
- Reads the axes correctly and describes the sawtooth shape as steady usage interrupted by deliveries that restore stock to the maximum level
- Identifies lead time as a horizontal distance on the diagram, the gap between the order being placed and the delivery arriving, not a stock quantity
- Calculates the re-order level as usage rate multiplied by lead time plus buffer stock, showing the working and keeping the units consistent
- Interprets a change on the diagram, for example a steeper slope showing faster usage or a longer lead time forcing a higher re-order level
- Explains buffer stock as protection against late delivery or a demand surge, and links holding it to extra cost
- Gives specific costs of excess inventory, including cash tied up, storage, insurance, shrinkage and obsolescence, rather than a general statement that too much stock is wasteful
- Gives specific costs of shortage, including lost contribution on unmade sales, idle capacity, emergency delivery costs and lasting customer defection
- Shows the impact on named stakeholders, for example shareholders through profit and cash, employees through short-time working, suppliers through erratic orders
- Uses a financial measure to support the argument, such as inventory turnover, the current or acid test ratio, or lost contribution per unit
- Reaches a judgement against explicit criteria, typically perishability, demand volatility, supplier reliability and the firm's liquidity position
Examiner Tips
- 💡Purchasing usually appears inside a wider question on costs, cash flow or quality, so connect it to the ratio or the figure the case supplies rather than treating it as a standalone topic
- 💡When asked to assess a change of supplier, set out criteria first, such as unit price, reliability and reputational risk, then judge the supplier against each in turn
- 💡Definition questions here are worth few marks, so give the meaning in one sentence and spend the time on the applied part of the question that follows
- 💡If the case gives inventory and cost of sales figures, calculate the ratio even when the question says explain, because a supported number lifts the answer above description
- 💡Questions here usually ask you to assess a proposed change to inventory policy, so build both sides, cash released against service risk, before judging
- 💡Use the case firm's product characteristics as your decisive criterion, because perishable, seasonal or fashion goods justify a very different answer from standard components
- 💡Questions frequently ask you to recommend a method for a named firm, so decide on stated criteria such as demand predictability, supplier distance and cash position
- 💡Bring in a real disruption example briefly to earn evaluative credit on the risk of just-in-time, then return to the case firm rather than narrating the event
- 💡Label directly on the diagram in the answer booklet if one is given, because examiners credit correct identification of each component
- 💡Show every step of a re-order level calculation, since method marks survive an arithmetic slip and a bare wrong answer earns nothing
- 💡If asked to comment on the diagram, say what it implies for the firm, such as vulnerability if the supplier is late, rather than only naming the parts
- 💡This is a long, high-tariff question, so plan two costed sides and a criterion-based judgement before writing anything
- 💡Quantify wherever the case allows, for example lost contribution equals selling price minus variable cost per unit multiplied by the units not sold
- 💡Distinguish a one-off shortage from a persistent one, because the stakeholder damage compounds only in the second case
Common Mistakes
- Assuming the cheapest supplier is always the right choice, ignoring that late or faulty deliveries stop production and cost far more than the unit saving
- Describing purchasing as simply ordering materials, with no reference to lead time, credit terms or quality tolerance, so there is nothing to analyse
- Confusing creditor days with debtor days, and so arguing that longer supplier credit worsens the firm's cash position when it improves it
- Inverting the turnover ratio by dividing average inventory by cost of sales and then reporting the answer as times per year, which produces a fraction and a nonsense conclusion
- Using revenue rather than cost of sales as the numerator, which inflates the turnover figure because revenue includes the profit margin
- Judging a turnover figure as good or bad with no comparison, when the same number is excellent for a furniture retailer and alarming for a bakery
- Writing that holding stock costs money without naming any specific cost, so the point stays generic and gains no application credit
- Ignoring the revenue side entirely and arguing that the lowest possible inventory is always best, which misses stock-out costs and lost customer loyalty
- Treating inventory as a liquid asset in a liquidity discussion, when unsold stock may take months to convert into cash and may have to be discounted heavily
- Claiming just-in-time means holding no stock at all, when it means holding very little and relying on frequent, dependable deliveries
- Presenting just-in-time as costless, ignoring more frequent deliveries, higher transport spend, tighter supplier contracts and much greater vulnerability to disruption
- Assuming a computerised system removes all errors, when theft, damage and mis-scanning make recorded levels drift from physical levels unless stock is counted
- Forgetting to add buffer stock when calculating the re-order level, which leaves the firm reaching zero at the exact moment the delivery is due
- Mixing units, for example a weekly usage rate with a lead time given in days, which multiplies the two into a meaningless figure
- Reading lead time off the vertical axis or confusing it with the re-order quantity, and then describing the diagram inaccurately
- Assuming usage is always constant, when the straight lines are a simplifying assumption that real seasonal demand breaks
- Arguing only one side, usually that too much stock is bad, and never pricing the cost of a stock-out, which caps the answer below the top evaluation band
- Describing stakeholder effects in identical terms for every group, so nothing distinguishes the customer's experience from the shareholder's
- Ignoring the case firm's product, and giving an answer about perishable goods that would also be written about steel stockholding