Scarcity, choice and opportunity cost - TCE Economics (Tasmania)
“Explain the economic problem of relative scarcity and how it forces individuals, firms and governments to make choices that carry an opportunity cost.”
Relative scarcity means our wants are unlimited but the resources to satisfy them are limited, so every society must choose what to produce, how to produce it and for whom. Every choice means giving up the next best alternative, which is its opportunity cost.
What this dot point is asking
Economics begins with one stubborn fact. Human wants are effectively unlimited, yet the resources available to meet them are finite. This mismatch is called relative scarcity, and it is the central economic problem that every individual, business and government faces.
The four resources
Economists group productive resources, also called factors of production, into four types. Land is all natural resources, such as Tasmania's farmland, forests and mineral deposits. Labour is human physical and mental effort. Capital is the produced goods used to make other goods, such as machinery, factories and software. Enterprise is the willingness of entrepreneurs to combine the other three resources and bear risk. Because each of these is limited at any point in time, output is limited too.
The economic problem that arises because human wants are unlimited while the resources available to satisfy them are limited, forcing choices about how resources are used.
The three basic economic questions
Every economy, whatever its system, must answer three questions. What to produce, given that we cannot produce everything. How to produce it, choosing between labour-intensive and capital-intensive methods. And for whom to produce, deciding how the goods and services are distributed across the population. In a market economy these questions are answered largely by the price mechanism; in a planned economy by government direction; and in a mixed economy such as Australia by a combination of both.
Opportunity cost
Because resources are scarce, choosing one option means forgoing others. The opportunity cost of a decision is the value of the next best alternative given up. If the federal government spends a billion dollars on a new hospital, the opportunity cost is the school, road or tax cut that the same money could have funded. Opportunity cost applies to everyone. A student choosing to study Economics gives up the time that could have gone to paid work or another subject.
Opportunity cost is not the sum of every option you reject. It is the single most valued alternative forgone. Identifying that one alternative is what earns marks in the exam.
The production possibility frontier
The production possibility frontier (PPF) is the standard diagram for showing scarcity, choice and opportunity cost. It plots the maximum combinations of two goods an economy can produce when all resources are fully and efficiently employed.
- Points on the frontier are efficient: all resources are used and you cannot make more of one good without making less of the other.
- Points inside the frontier are inefficient, signalling unemployed or underused resources, such as an economy in recession.
- Points outside the frontier are unattainable with current resources and technology.
The frontier is usually drawn bowed outward because resources are not equally suited to producing both goods, so opportunity cost rises as you specialise. Economic growth, from more resources or better technology, shifts the whole frontier outward.
Step 1: Read the two production points
An economy can produce either 100 units of health services and 0 units of defence (point A), or 80 health and 30 defence (point B).
Step 2: Find what is gained
Moving from A to B raises defence output from 0 to 30, a gain of 30 units of defence.
Step 3: Find what is given up
Over the same move, health output falls from 100 to 80, a sacrifice of 20 units of health.
Step 4: State the opportunity cost
The opportunity cost of the 30 extra units of defence is the 20 units of health forgone. Per unit, that is units of health for each unit of defence.
Choices at every level
The same logic applies across the economy. Consumers with limited income choose which goods to buy. Firms with limited budgets choose which projects to fund and which inputs to use. Governments choose between competing spending priorities and between spending now and saving for later. When the Reserve Bank of Australia or the Treasury weighs growth against inflation, it is making a scarcity-driven choice with a real opportunity cost.
Students often write opportunity cost in dollars alone. The true cost includes time, effort and forgone alternatives, not just the price tag. The opportunity cost of an hour of study is the next best use of that hour, which may have no dollar figure attached.
Understanding scarcity, choice and opportunity cost is the foundation for everything that follows. Markets, government policy and trade are all responses to the same basic problem: how a society allocates limited resources among unlimited competing wants.
Exam-style questions
Questions in the style of TASC exam questions on this dot point, each with a worked answer. They are written by ExamExplained unless tagged "Past paper"; the year shows the paper a question is modelled on.
Practice6 marksThe diagram is the production possibility frontier for an economy showing the maximum quantity of manufactured and non-manufactured goods possible if all resources are utilised. i. What is the opportunity cost of manufactured goods if production moves from point A to point B on the frontier? ii. Explain two (2) ways that this economy could reach production levels represented by point C.Show worked answer →
i. Opportunity cost is what must be given up to gain something else. Moving from A to B along the frontier raises manufactured output, so the opportunity cost is the quantity of non-manufactured (other) goods forgone, that is, the fall in non-manufactured goods read off the vertical axis between A and B. State it as a quantity, for example "40 units of non-manufactured goods given up to gain the extra manufactured goods".
ii. Point C lies outside the current frontier, so it is unattainable with present resources. The economy can reach it only by shifting the PPF outward (economic growth). Give two ways, for example: (1) an increase in the quantity or quality of resources, such as growth in the labour force through population or skilled migration, or new capital investment; (2) an improvement in technology or productivity that lets the same resources produce more. Either raises productive capacity and pushes the frontier out to include C.
Practice6 marksIf left to operate freely, a market economy may produce insufficient quantities of some products and undesirable quantities of other products. Explain, using one example in each case, how governments may react to each of these circumstances in Australia's modified market economy.Show worked answer →
This is about how scarcity forces choices and why markets alone do not always allocate scarce resources to the best uses.
Insufficient quantities (under-provision). Markets under-produce goods with positive externalities or public-good features because private producers cannot capture the full social benefit. Government reacts by providing or subsidising them. Example: public education or vaccination is subsidised or directly provided so output rises toward the socially desirable level.
Undesirable quantities (over-provision). Markets over-produce goods with negative externalities because producers ignore the cost imposed on third parties. Government reacts by taxing, regulating or banning them. Example: a tax on tobacco or carbon raises price and reduces the quantity consumed toward the socially efficient level.
Conclude that in a modified (mixed) market economy government corrects these allocation problems while leaving most resource allocation to the price mechanism.