Scarcity & Economic Methodology
Scarcity & Economic Methodology
Economics is the study of how societies allocate scarce resources among competing uses. The fundamental economic problem arises because human wants are unlimited while resources are finite.
The Economic Problem
Scarcity means there are insufficient resources to satisfy all human wants. This forces individuals, firms, and governments to make choices, which inevitably involve opportunity cost — the next best alternative forgone.
Factors of Production
| Factor | Description | Reward |
|---|---|---|
| Land | Natural resources (minerals, oil, water) | Rent |
| Labour | Human effort (physical and mental) | Wages |
| Capital | Man-made aids to production (machinery, factories) | Interest |
| Enterprise | Risk-taking and organisation | Profit |
Production Possibility Frontiers (PPFs)
A PPF (or PPC) shows the maximum combinations of two goods an economy can produce using all available resources efficiently.
- Points on the curve = productively efficient
- Points inside the curve = inefficient (unemployed resources)
- Points outside the curve = currently unattainable without growth
Shifts outward occur through:
- Technological progress
- Increased quantity or quality of factors of production
- Immigration (increases labour supply)
Opportunity cost is shown by the gradient of the PPF. A concave PPF reflects increasing opportunity costs due to specialisation of resources.
Economic Methodology
Positive vs Normative Statements
- Positive statements are objective and can be tested with evidence: "A rise in interest rates will reduce consumer spending."
- Normative statements are value judgements that cannot be empirically verified: "The government should raise the minimum wage."
Economics uses both, but scientific method relies on positive analysis.
The Scientific Method in Economics
1. Observation of real-world phenomena
2. Hypothesis formation
3. Model building (simplification of reality)
4. Testing against data
5. Revision or acceptance
Ceteris paribus ("all other things being equal") is a key assumption, allowing economists to isolate the effect of one variable.
Economic Models
Models are simplified representations of reality. They include assumptions that may not hold perfectly, but they provide useful frameworks for analysis.
Key models at A-Level include:
- Supply and demand diagrams
- AD/AS models
- The Phillips curve
- The Keynesian cross
Free Market vs Command vs Mixed Economies
Free Market Economy
- Resources allocated by the price mechanism
- Private ownership of factors of production
- Consumer sovereignty drives production decisions
- Adam Smith's "invisible hand" — self-interest leads to socially optimal outcomes
- Strengths: efficiency, innovation, consumer choice
- Weaknesses: inequality, market failure, instability
Command Economy
- State allocates resources through central planning
- Government ownership of means of production
- Strengths: equality, provision of public goods, full employment possible
- Weaknesses: inefficiency, lack of incentives, information problems, Hayek argued central planners lack the dispersed knowledge held by market participants
Mixed Economy
- Combination of market and state allocation
- Most real-world economies are mixed
- Degree of government intervention varies
Specialisation & the Division of Labour
Adam Smith (1776) used the pin factory example to illustrate the benefits of division of labour:
- Higher output per worker (productivity)
- Workers develop expertise
- Time saved switching tasks
- Facilitates mechanisation
Limitations:
- Monotony and reduced job satisfaction
- Structural unemployment if skills become obsolete
- Over-dependence on others (supply chain risks)
Free Trade & Comparative Advantage
David Ricardo's theory of comparative advantage states that countries should specialise in producing goods where they have the lowest opportunity cost, even if they have an absolute disadvantage in all goods.
Assumptions of the Model
- Two countries, two goods
- Perfect factor mobility within countries
- No transport costs
- Constant returns to scale
Evaluation
- Strengths: explains why trade is mutually beneficial; supported by empirical evidence of trade growth
- Weaknesses: ignores transport costs, tariffs, exchange rate effects; assumes constant costs; developing countries may be locked into primary production
Behavioural Economics & Rationality
Traditional (neoclassical) economics assumes agents are rational — they maximise utility (consumers) or profit (firms) using all available information.
Behavioural economics challenges this, drawing on psychology:
- Bounded rationality (Herbert Simon): people "satisfice" rather than optimise due to cognitive limitations
- Anchoring: decisions influenced by initial reference points
- Availability bias: overweighting easily recalled information
- Default bias: tendency to accept pre-set options (relevant to pension auto-enrolment policy)
Policy Implications
- Nudge theory (Thaler & Sunstein): structuring choices to guide behaviour without restricting freedom
- Examples: opt-out organ donation, calorie labelling, default pension enrolment
Evaluation: Methodology Debates
Strengths of economic models:
- Provide structure for policy analysis
- Allow predictions to be tested
- Facilitate comparison across economies
Weaknesses:
- Assumptions rarely hold in reality
- Human behaviour is unpredictable
- Models may reflect ideological bias
- Econometrics can establish correlation but proving causation is difficult
Key thinkers: Adam Smith (market mechanism), Karl Marx (critique of capitalism), John Maynard Keynes (role of government), Friedrich Hayek (information and markets), Milton Friedman (monetarism and positive economics).
Exam Technique
- Always define key terms at the start of an answer
- Use diagrams where relevant (PPF, supply/demand)
- Distinguish positive from normative in evaluation
- Apply real-world examples (UK government policies, current events)
- 25-mark essays require two-sided evaluation with a justified conclusion