1. The basic economic problem
- Syllabus
- 0455–2027–2028
- Section
- 1
- Level
- —
Exam analysis
1.1. The nature of the basic economic problem
- Syllabus
- 0455–2027–2028
- Topic
- 1.1
- Level
- —
Scarcity forces every economic agent to choose
The basic economic problem is that resources are finite while human wants are unlimited. Because available resources cannot satisfy every want, resources are scarce and choices must be made.
Scarcity is relative: even a wealthy person or country still has limited income, time, workers, equipment, land and natural resources compared with all possible wants. Economic growth can expand what is available, but it does not remove the problem if wants continue to exceed resources.
| Decision-maker | Scarce resource and resulting choice |
|---|---|
| consumer | limited income and time mean not every desired product can be obtained |
| worker | limited time, skills and job opportunities require choices about work |
| producer/firm | limited labour, equipment and finance require choices about output |
| government | limited tax revenue and resources require choices among public priorities |
A government may want more hospitals, schools and transport, yet its budget and available workers are limited. Building all projects immediately is impossible, so it must decide how to allocate what it has.
Scarcity does not mean that nothing exists, nor does it require poverty or an unequal distribution. It means resources are insufficient relative to all wants, which is why choices remain necessary.
Answer the three resource-allocation questions
Scarcity requires every economy to decide what to produce, how to produce it and for whom to produce it. Together, these questions determine how scarce resources and the resulting output are allocated.
| Question | Decision being made | Example |
|---|---|---|
| what to produce? | which goods and services, and how much of each | car batteries or laptop batteries |
| how to produce? | which production method and mix of resources | more workers or more machinery |
| for whom to produce? | who receives or can obtain the output | how products are distributed among income groups |
The questions are linked. Choosing more of one product uses resources that cannot simultaneously make every other product; choosing a labour-intensive or capital-intensive method changes which resources are used; distribution determines which groups benefit from the output.
‘How much?’ belongs inside what to produce, and ‘when?’ is not one of the three named questions. ‘For whom?’ is about the recipients of output, not the identity of the workers who manufacture it.
Classify economic goods and free goods
An economic good is scarce relative to wants and uses resources to provide, so obtaining or producing it has an opportunity cost. A free good is available without using scarce resources and has no opportunity cost.
| Feature | Economic good | Free good |
|---|---|---|
| availability relative to wants | limited/scarce | sufficiently abundant |
| scarce resources used to provide it | yes | no |
| opportunity cost | yes | no |
| typical example | food | sunlight or naturally available air |
Producing food uses land, labour and capital that could have been used elsewhere, so food is an economic good. Naturally available sunlight does not need resources to produce and, in ordinary conditions, using it does not require another output to be sacrificed.
‘Free good’ does not simply mean a zero price. State-funded healthcare or a free sample still uses scarce resources, so it is an economic good even if the user pays nothing at the point of use. Classify by scarcity and opportunity cost, not by the price charged.
1.2. Factors of production
- Syllabus
- 0455–2027–2028
- Topic
- 1.2
- Level
- —
Match productive resources to their rewards
Factors of production are the resources or inputs used to produce goods and services. Each factor makes a different contribution and receives a corresponding factor reward.
| Factor | Meaning | Reward | Example |
|---|---|---|---|
| land | natural resources used in production | rent | soil, forests, oil or fishing waters |
| labour | human physical and mental effort | wages | a driver, engineer or hotel worker |
| capital | human-made goods used to produce other goods and services | interest | machinery, an aircraft or a factory |
| enterprise | organising the other factors, making decisions and bearing business risk | profit | an entrepreneur starting and directing a firm |
Classify the resource by what it contributes. A forest is land because it is natural; a wooden factory is capital because it is human-made for production. A pilot supplies labour, while the entrepreneur who organises the airline and accepts the risk supplies enterprise.
Money itself is not capital in this classification: it can finance the purchase of capital goods, but capital means productive assets such as tools and equipment. Do not swap the rewards: land–rent, labour–wages, capital–interest and enterprise–profit.
Explain changes in factor quantity and quality
The quantity of a factor means how much is available; its quality means how productive or capable each unit is. A cause may change one, both, or neither, so the link must be explained.
| Factor | Causes of quantity change | Causes of quality change |
|---|---|---|
| land | discovery/reclamation adds usable resources; depletion or damage reduces them | irrigation, fertiliser or conservation can improve productivity; erosion or pollution can reduce it |
| labour | population, migration, retirement age and participation alter the labour force | education, training, healthcare and experience affect skills and productivity |
| capital | investment adds equipment; depreciation, destruction or low investment reduces the stock | newer technology and maintenance can improve productive performance |
| enterprise | incentives, expected profit, regulation and access to finance affect how many entrepreneurs operate | education, experience and business skills affect the quality of decisions and organisation |
Land reclamation increases the quantity of usable land; fertilising existing land mainly improves its quality. Immigration of working-age people can increase labour quantity, while training existing workers improves labour quality and may raise their productivity.
Do not label every improvement as a quantity increase. Retraining pilots or replacing aircraft with more advanced models improves factor quality even if the number of workers or aircraft is unchanged. State the mechanism and the affected factor, not just the policy name.
1.3. Opportunity cost
- Syllabus
- 0455–2027–2028
- Topic
- 1.3
- Level
- —
Find the next-best alternative forgone
Opportunity cost is the next-best alternative forgone when a choice is made. It exists because scarce resources such as time, income, land and equipment cannot usually be used for every alternative at once.
First identify the option chosen. Then rank the options that were rejected. The opportunity cost is the best rejected option—not the sum of everything else that could have been done.
| Choice made | Best rejected alternative | Opportunity cost |
|---|---|---|
| a farmer grows potatoes rather than wheat | grow wheat | the wheat output forgone |
| a graduate works in a bank rather than teaches | teach economics | the benefits of the teaching job forgone |
| a government funds wind farms rather than extra healthcare | expand healthcare | the healthcare benefits forgone |
Opportunity cost is not automatically the money paid for the chosen option. A free activity can still have an opportunity cost if it uses time that could have produced the next-best benefit. Always name the alternative sacrificed, not merely the price of the choice.
Use opportunity cost to explain economic choices
Opportunity cost influences a decision when an economic agent compares the expected benefit of the chosen use of a limited resource with the benefit of its next-best use. A larger sacrifice makes the chosen option less attractive; a larger expected benefit can justify accepting that sacrifice.
| Economic agent | Limited resource and choice | Relevant opportunity cost |
|---|---|---|
| consumer | spend limited income on one product rather than another | benefit from the next-best product not bought |
| worker | choose between jobs, training, university or leisure | earnings, experience or satisfaction from the next-best option |
| producer/firm | use finance, labour or land for one output or investment | profit or output from the next-best project |
| government | allocate a limited budget among public programmes | social benefit from the next-best programme not funded |
For example, a school leaver comparing university with immediate full-time work considers the earnings forgone while studying as part of the opportunity cost. This is weighed against expected benefits such as qualifications, future earnings and satisfaction from study.
Opportunity cost helps explain a choice but does not prove that one option is correct for everyone. Agents may rank benefits differently, face different constraints or hold different information. The analysis must identify the scarce resource, the chosen option and the next-best alternative forgone.
1.4. Production possibility curve (PPC) diagrams
- Syllabus
- 0455–2027–2028
- Topic
- 1.4
- Level
- —
Build and read a production possibility curve
A production possibility curve (PPC) shows the maximum combinations of two types of output that an economy can produce in a given period when it uses its current resources and technology.
To draw one: 1. Put the output of one good on the horizontal axis and the other on the vertical axis. 2. Label both axes with quantities, not prices. 3. Plot attainable maximum combinations. 4. Join the frontier as a downward-sloping line or curve reaching both axes.
Moving along the frontier raises the output of one good only by reducing the other because resources are finite. The intercept on each axis is the largest output possible when all suitable resources are devoted to that good; other points on the PPC show maximum mixed combinations.
A PPC is a simplified capacity boundary, not a record of what consumers demand or what firms earn. Its position is interpreted for the stated resources, technology and time period; if productive capacity changes, the curve itself can shift.
Interpret points inside, on and beyond a PPC
A production point's location shows whether the output combination is efficient, inefficient or currently unattainable with the economy's existing productive capacity.
| Location | Meaning | What would be needed to change it? |
|---|---|---|
| inside / under the PPC | attainable but inefficient: some resources are unemployed, underused or misallocated | use existing resources more fully to move toward the curve |
| on the PPC | attainable and productively efficient: maximum output is obtained from current resources and technology | reallocate resources to change the mix while remaining efficient |
| beyond / outside the PPC | not currently attainable | increase the quantity or quality of resources or improve technology so capacity expands |
If a recession creates unemployment, actual production may move from the PPC to a point inside it. The economy has spare capacity, but the PPC need not shift because the quantity and quality of productive resources may be unchanged.
A point on the PPC means productive efficiency, not necessarily the best allocation for society. The economy may still prefer a different combination on the same frontier, depending on its priorities.
Measure opportunity cost along a PPC
A movement along a PPC is a reallocation of existing resources between the two outputs. More of one output is gained, but some of the other output is forgone; that sacrifice is the opportunity cost.
Read the coordinates before and after the move. Calculate the increase in the chosen output and the decrease in the other. The total opportunity cost of the increase is the amount of the other output lost.
| Point | Good X | Good Y |
|---|---|---|
| A | 80 | 20 |
| B | 60 | 35 |
Moving from A to B gains 15 units of Y and gives up 20 units of X. The opportunity cost of the additional 15 Y is therefore 20 X; the opportunity cost per extra unit of Y is 20/15=1.33 units of X.
Do not call a movement along the existing curve economic growth: productive capacity has not increased. The economy has changed its output mix. Growth is represented by an outward shift of the PPC.
Explain inward and outward shifts of a PPC
A PPC shifts when an economy's productive capacity changes. An outward shift means it can produce more than before and represents economic growth; an inward shift means its maximum possible output has fallen.
| Shift | Causes | Consequence |
|---|---|---|
| outward | more or better resources; investment in capital; improved education or labour productivity; technological progress | previously unattainable combinations may become attainable |
| inward | destruction or depletion of resources; loss of workers; damage to capital; lower resource quality | some previously attainable combinations become unattainable |
A change that raises capacity for both outputs shifts the whole frontier outward. If technology improves only the production of one good, the frontier can rotate outward toward that good's axis while the other intercept remains unchanged.
Lower unemployment or recovery from recession normally moves production from inside the PPC toward the existing curve: it uses spare resources but does not by itself expand capacity. A lasting change in the amount, quality or productivity of resources shifts the frontier.
An outward shift shows potential growth, not a guarantee that every output will actually rise. The point chosen on the new curve still depends on how resources are allocated between the two goods.