AQA A-Level Economics (7136) · The Operation of Markets
Specification points
- Economics as a social science; the use of models and ceteris paribus.
- Positive and normative statements; value judgements.
- The economic problem: scarcity, choice and opportunity cost.
- Production possibility diagrams; economic resources and their allocation.
Economics as a social science
Economics uses models and the assumption of _ceteris paribus_ to study how scarce resources are allocated. Positive statements are objective and testable; normative statements are value judgements about what *ought* to happen and cannot be tested.
The economic problem
Wants are unlimited but resources are scarce, forcing choice. Every choice carries an opportunity cost — the next best alternative forgone.
Scarcity → choice → opportunity cost.
Key definitions
| Term | Definition |
|---|---|
| Scarcity | Limited resources cannot satisfy unlimited wants. |
| Opportunity cost | The value of the next best alternative forgone. |
| Ceteris paribus | The assumption that other variables are held constant. |
| Factors of production | Land, labour, capital and enterprise. |
Production possibility diagrams
A PPF shows the maximum output combinations of two goods when resources are fully and efficiently used. Points on the curve are efficient; inside show spare capacity; outside are unattainable. A movement along shows opportunity cost; an outward shift shows economic growth.
Allocating resources
Economies answer *what, how and for whom* to produce. Free-market, command and mixed systems allocate resources differently, and most economies are mixed — using markets with government intervention.
Worked example
A government reallocates resources from consumer to capital goods. Consumption falls now (opportunity cost), but the extra capital raises future capacity, shifting the PPF outward — illustrating the growth trade-off central to AQA micro and macro.
Common exam mistakes
- Confusing positive (testable) and normative (opinion) statements.
- Treating a point inside the PPF as unattainable rather than inefficient.
- Saying resources are unlimited — it is *wants* that are unlimited.
Exam technique
Define terms precisely, use the PPF to illustrate opportunity cost and growth, and separate positive analysis from normative judgement in evaluation.
Quick revision
- Positive = testable; normative = value judgement.
- PPF: on = efficient, inside = spare capacity, outside = unattainable.
- Systems: free-market, command, mixed.