1. 1. Nature of Economics as a Social Science★★☆☆☆⏱ 5 min

Economics is a social science that studies how societies allocate scarce resources to meet unlimited wants. Unlike natural sciences, it cannot conduct controlled experiments, so it relies on simplified models built on assumptions, including the ceteris paribus assumption that all other variables remain unchanged when analysing a relationship between two factors.

Exam tip:

For 4-mark explain questions on positive/normative classification, always explicitly state whether the statement is testable or value-based to secure full marks.

2. 2. Scarcity, Opportunity Cost and Economic Goods★★☆☆☆⏱ 5 min

The fundamental economic problem is scarcity: unlimited human wants facing finite resources, which can be renewable (replenished naturally, e.g. wind power) or non-renewable (finite stock, e.g. oil). Scarcity means every choice has an opportunity cost. Goods are classified as free goods (no opportunity cost to produce, e.g. sunlight) or economic goods (have an opportunity cost, as their production uses scarce resources).

Exam tip:

For 2-mark calculate questions on opportunity cost, always state the definition first to guarantee full marks, even if the calculation is simple.

3. 3. Production Possibility Frontiers (PPFs)★★★☆☆⏱ 6 min

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The PPF is a concave curve showing the maximum output of two goods an economy can produce with fixed resources and technology. Points on the curve are productively efficient, points inside the curve are inefficient (unused resources), and points outside the curve are unobtainable with current resources. Movements along the PPF show opportunity cost of reallocating resources, while outward shifts of the PPF show economic growth caused by technological progress, increases in labour supply, or capital investment. Investing in capital goods (used to produce other goods) rather than consumer goods (used directly by households) leads to higher long-term productivity and growth.

Exam tip:

Always label all axes, curves and points clearly for PPF diagram questions: you lose a maximum of 2 marks if axes are unlabelled, even if the curve is drawn correctly.

4. 4. Specialisation, Division of Labour and Functions of Money★★★☆☆⏱ 5 min

Adam Smith first formalised the benefits of division of labour in his 1776 pin factory example, where breaking pin production into 18 small specialised tasks increased output per worker by over 4000%. Specialisation increases productivity but requires a medium of exchange (money) to allow workers to trade their output for other goods. Key functions of money include medium of exchange, measure of value, store of value, and standard of deferred payment. Financial markets support economic activity by facilitating saving, lending funds to firms, enabling exchange, operating forward markets, and issuing equities (shares in firms).

Exam tip:

For 4-mark explain questions on division of labour, reference Adam Smith's pin factory example to add context and secure full KAA marks.

5. 5. Economic Systems: Free Market, Mixed and Command★★★★☆⏱ 6 min

Economic systems determine how scarce resources are allocated. Pure free market systems have no state intervention, with resources allocated by the price mechanism: advantages include high efficiency and innovation, while disadvantages include underprovision of public goods and high inequality. Pure command systems have full state control of resource allocation: advantages include reduced inequality and guaranteed public good provision, while disadvantages include low efficiency and lack of innovation. Mixed economies combine both systems, with the state playing a role in providing public goods, correcting market failure, and redistributing income.

Exam tip:

For 14-mark discuss questions on economic systems, always include both advantages and disadvantages, plus a concluding judgement on which system is most effective in a given context.