OxfordAQA International GCSE Economics: Costs, revenue, profit, productivity and economies of scale (9214)

This guide covers section 3.1.4 (Production, costs, revenue and profit) of Topic 1, How markets work, in the OxfordAQA International GCSE Economics (9214) specification, first examined May/June 2025. It teaches 3.1.4.1 (cost, revenue and profit), 3.1.4.2 (production and productivity) and 3.1.4.3 (economies of scale). The course is not tiered. All the firms, markets and numbers that follow are made up, and money is counted in an unnamed currency unit.

Related pages: the course hub, the printable checklist, the revision notes, the practice questions, the How markets work guide and the free 10-minute diagnostics.

What you must be able to do

Section	Outcome
3.1.4.1	Explain business objectives: profit, sales growth, market share
3.1.4.1	Identify and calculate total and average fixed and variable costs
3.1.4.1	Identify and calculate total and average revenue
3.1.4.1	Use total revenue minus total costs = profit; explain how profit can rise
3.1.4.1	Explain why higher prices give producers an incentive to expand
3.1.4.1	Discuss moral and ethical conflicts and how producers might respond
3.1.4.2	Distinguish production from productivity; measure it; factors; benefits
3.1.4.3	Economies of scale (five types); diseconomies; effects on behaviour; costs and benefits of growth

3.1.4.1 Business objectives

A business objective is the aim a firm sets for itself. The specification names three.

• Profit: the surplus left after costs are paid. Owners often want as much as possible, and profit pays for new equipment and dividends.
• Sales growth: selling more units or earning more revenue each year. A firm may accept lower profit now to reach more customers, for example by charging low prices.
• Market share: the slice of the whole market that one firm supplies, found by dividing its sales by the whole market’s sales and multiplying by 100.

Worked example (market share). In Year 1 the market for packed lunches in a small town is 50,000 boxes. Firm A sells 8,000. Market share = 8,000 / 50,000 x 100 = 16%. In Year 2 the market is 55,000 boxes and Firm A sells 9,500. Share = 9,500 / 55,000 x 100 = 17.3%. Sales grew by (9,500 - 8,000) / 8,000 x 100 = 18.75%, while the market grew by 10%, so Firm A took a larger slice.

Objectives can conflict. Cutting price to win share may raise sales but cut profit per unit. A new firm may chase sales growth, while an established one may prefer profit.

Types of costs

Costs are the expenses of production.

• Fixed costs do not move with the amount produced during the short run, for instance rent or a loan repayment. They must be paid even if nothing is made.
• Variable costs change with output, such as flour or packaging.

Measure	Formula
Total fixed cost (TFC)	Given in the data, or added up
Total variable cost (TVC)	Given or added up
Total cost (TC)	TFC + TVC
Average fixed cost (AFC)	divide TFC by the units made
Average variable cost (AVC)	divide TVC by the units made
Average (total) cost (ATC)	divide TC by the units made; the answer matches AFC + AVC

Worked example (a small bakery). TFC is 600 a week. The bakery sells every loaf at price 6.

Output (loaves)	TFC	TVC	TC	AFC	AVC	ATC
100	600	400	1,000	6.00	4.00	10.00
200	600	720	1,320	3.00	3.60	6.60
300	600	1,020	1,620	2.00	3.40	5.40
400	600	1,360	1,960	1.50	3.40	4.90
500	600	1,800	2,400	1.20	3.60	4.80

Check one row: at 400 loaves, TC = 600 + 1,360 = 1,960, and ATC = 1,960 / 400 = 4.90, which equals AFC 1.50 + AVC 3.40. Notice that AFC keeps falling as output rises, since a fixed bill is shared among more loaves.

Types of revenue and profit

Total revenue (TR) is what a firm takes in from selling: price multiplied by the number of units sold. Average revenue (AR) is TR divided by units sold, and when every unit goes at one price it is simply that price.

For the bakery, the price is 6, so TR = 6 x output. For a different product, if TR = 7,200 from 900 units, AR = 7,200 / 900 = 8.00.

Profit = TR - TC. If this comes out below zero, the firm has made a loss.

Output	TR	TC	Profit
100	600	1,000	-400
200	1,200	1,320	-120
300	1,800	1,620	180
400	2,400	1,960	440
500	3,000	2,400	600

The bakery makes a loss at 100 and 200 loaves, and profit from 300 loaves upwards. Profit per unit can also be found as price minus ATC: at 400 loaves, 6.00 - 4.90 = 1.10 per loaf, and 1.10 x 400 = 440.

Ways to raise profit

Profit equals TR minus TC, so a firm can lift it by lowering average costs, by raising revenue, or by doing both.

1. Reduce average costs: find cheaper suppliers, cut waste, raise productivity, or spread fixed costs over more output.
2. Increase revenue: raise the price, or sell more units.

Worked example. At 400 loaves, profit is 440. Suppose ATC falls by 0.50 to 4.40: profit rises by 0.50 x 400 = 200, to 640. Alternatively, suppose the price rises by 0.50 with sales unchanged: TR rises by 0.50 x 400 = 200, again to 640. The evaluation point is that a higher price may cut sales, and a cheaper input may cut quality.

The price incentive to expand

If costs hold steady, a higher price leaves a bigger gap between price and cost on every unit, which gives producers a reason to expand production. At 400 loaves, ATC is 4.90. At price 6.00, profit per loaf is 1.10 and total profit is 440. If the price rose to 8.00, profit per loaf would be 3.10 and total profit would be 8.00 x 400 - 1,960 = 1,240. Producers also bring in more resources to supply more. This is the reasoning behind an upward-sloping supply curve: a rise in price moves producers along the supply curve to a higher quantity supplied.

Moral and ethical considerations

Producers want profit, but profit-seeking can conflict with the interests of workers, consumers, communities and the environment. Examples:

• cutting costs by paying very low wages or ignoring safety rules
• dumping waste to avoid disposal costs
• misleading advertising to raise sales

How producers might respond: adopt an ethical code, pay fair wages, source materials responsibly, cut pollution, report openly on their impact, or follow laws set by government. These choices often add to costs in the short run. Evaluation: a good reputation can win loyal customers and workers, and avoids fines or boycotts, so ethical behaviour may protect long-run profit. But a firm in a very price-sensitive market may find the extra cost hard to carry.

3.1.4.2 Production and productivity

Production is how many goods or services a firm makes in total. Productivity is output per unit of input, most simply output per worker or output per worker per hour.

Productivity is total output divided by the workers employed, or by the hours they work.

Worked example. A workshop employs 12 workers and makes 1,440 units a week. Productivity = 1,440 / 12 = 120 units per worker. After training and a new machine, the same 12 workers make 1,800 units. Productivity = 1,800 / 12 = 150, a rise of (150 - 120) / 120 x 100 = 25%. Output per worker per hour (40-hour week): 120 / 40 = 3.0 before, 150 / 40 = 3.75 after.

Production can rise while productivity falls. Suppose the workshop hires 3 more workers (15 in total) and makes 1,650 units. Production rises by (1,650 - 1,440) / 1,440 x 100 = 14.6%, but productivity is 1,650 / 15 = 110 units per worker, a fall of 8.3%. More output came from more workers, not better use of them.

Factors influencing productivity:

• Capital: more or better machinery and technology
• Skills and training: educated, trained and healthy workers
• Motivation: pay incentives, good management, good working conditions
• Organisation: specialisation and division of labour, good layout and planning
• Resource quality: reliable materials, power and transport

Benefits of higher productivity: lower average costs per unit, since the same inputs make more; room for higher wages or profit; lower prices or better competitiveness; and more output from limited resources. For a country, higher productivity supports growth.

Link this to cost. If each worker is paid 600 a week, the wage bill per unit is 600 / 120 = 5.00 at the old productivity and 600 / 150 = 4.00 at the new.

3.1.4.3 Economies of scale

Economies of scale occur when raising production lowers a firm’s average cost. They are a long-run idea, because all inputs, including premises and machinery, can change.

Type	How average cost falls
Managerial	The firm can employ specialist managers (finance, marketing), who run each area more efficiently
Purchasing	Buying materials in bulk earns discounts, so cost per unit falls
Financial	Large, established firms are seen as lower risk, so they borrow more easily and pay a lower interest rate
Technical	Large machines and mass-production methods share their cost across many units, and costly equipment stays in use
Risk-bearing	A firm trading in several product lines and markets shares out its risk, so one failure hurts less and it can take on bigger projects

Diseconomies of scale are rising average costs when a firm grows too large. Causes: communication problems and slow decisions through many layers of management; poor coordination between departments; workers feel remote and lose motivation, so productivity falls; and managers lose control and waste builds up.

Worked example (long-run average cost). A firm’s total cost at each scale is below.

Output	Total cost	Average cost
1,000	12,000	12.00
2,000	20,000	10.00
3,000	27,000	9.00
4,000	36,000	9.00
5,000	47,500	9.50
6,000	60,000	10.00

Average cost = total cost / output. It falls from 12.00 to 9.00 between 1,000 and 3,000 units, a fall of (9 - 12) / 12 x 100 = -25%: economies of scale. It is level from 3,000 to 4,000. Above 4,000 it rises to 10.00, an 11.1% rise from 9.00 (4,000 to 6,000 units): diseconomies of scale.

Effects on business behaviour: firms may pursue growth to cut costs, charge lower prices, win market share and shut out smaller rivals who cannot match their costs. Small firms may look for a niche, or merge.

Costs and benefits of growth:

Benefits	Costs
Economies of scale and lower average costs	Diseconomies of scale if too big
Higher sales, profit and market share	Large funding needed, so debt or lost control
Spreading risk across products and markets	Harder to manage and motivate staff
More bargaining power with suppliers	Slower decisions; risk of unused capacity if demand falls

Common errors

• Calling rent a variable cost, or raw materials a fixed cost.
• Dividing fixed cost by the wrong output, or forgetting that ATC = AFC + AVC.
• Confusing revenue with profit.
• Saying productivity has risen because output rose, without checking the number of workers.
• Describing economies of scale as “bigger is cheaper” without naming the type and the reason.
• Treating economies of scale as short-run: they need the firm to change its whole scale.

Official syllabus

OxfordAQA International GCSE Economics (9214), version 1.0, for exams from May/June 2025 onwards, published by OxfordAQA. Sections 3.1.4.1, 3.1.4.2 and 3.1.4.3.