Scarcity, choice and opportunity cost; the production possibility frontier; specialisation, the division of labour and productivity.

What this dot point is asking

WJEC wants you to explain why scarcity forces every economy to make choices, to model the cost of those choices with the production possibility frontier, and to show how specialisation and the division of labour raise productivity.

The answer

Scarcity, choice and opportunity cost

Because resources are scarce, every economic agent (consumers, firms and governments) must choose what to produce, how to produce it and for whom. Every choice involves a sacrifice. A government that spends more on the NHS has less to spend on schools; a student who revises economics forgoes the leisure they could have had. Expressing choices in terms of opportunity cost forces economic thinking to be about trade-offs, not free goods.

The production possibility frontier

The PPF is normally drawn bowed outward (concave to the origin) because resources are not equally productive in both uses. As an economy moves resources from producing one good to the other, it transfers its least suitable resources first, then increasingly suitable ones, so the opportunity cost of each extra unit rises. A movement along the frontier shows reallocation and opportunity cost; an outward shift of the whole frontier shows economic growth in potential output, caused by more or better resources or improved technology. A point inside the frontier represents a recession or other waste of capacity.

Specialisation, division of labour and productivity

Adam Smith's pin factory is the classic illustration: dividing pin-making into separate tasks raised output enormously. Specialisation raises productivity because workers become more skilled at a narrow task, less time is lost moving between jobs, and investing in specialist capital becomes worthwhile. Higher productivity shifts the PPF outward. Specialisation also requires exchange and therefore money: a specialised worker must trade their output for everything else they consume. The drawbacks are boredom and lower motivation, higher labour turnover, and the risk of structural unemployment if demand for a narrow skill collapses.

Examples in context

Example 1. Investment versus consumption in the UK. A choice between producing capital goods (machinery, infrastructure such as HS2) and consumer goods captures the present-versus-future trade-off. Devoting resources to capital goods today reduces current consumption but shifts the PPF outward in future, raising potential output. This is why economists watch the UK investment share of GDP, which has historically been below that of many comparable economies, as a constraint on long-run growth.

Example 2. Specialisation in the Welsh economy. Regions and countries specialise according to comparative strengths. Parts of Wales specialise in activities such as advanced manufacturing, tourism and agriculture, trading their output for goods produced more cheaply elsewhere. Specialisation raises productivity and incomes but creates dependence: a region reliant on one industry, as the south Wales valleys once were on coal and steel, faces severe structural unemployment if that industry declines, illustrating both the gains and the risks of specialisation.

Try this

Q1. Define opportunity cost. [2 marks]

• Cue. The value of the next best alternative forgone when a choice is made.

Q2. Explain why a production possibility frontier is usually drawn bowed outwards from the origin. [3 marks]

• Cue. Resources are not equally suited to both goods, so as more of one good is produced, increasingly unsuitable resources are switched, and the opportunity cost of each extra unit rises.