1Chapter roadmap
Nature & scope of economics(Sec. I)
→
Scarcity, choice & opportunity cost
→
Production possibility frontier
→
Economic systems & Islamic economics(Sec. II)
Theme: every household, firm, government and international agent constantly makes choices because wants are unlimited but resources are scarce — this chapter builds the vocabulary (micro/macro, scarcity, opportunity cost, PPF) and then shows how different economic systems answer the three central questions: What, How and For Whom to produce.
2Key definitions
Economics (Adam Smith, 1776)"Science of Wealth" – studies production, exchange, distribution and consumption of wealth (via Land, Labour, Capital, Entrepreneur).
Economics (Alfred Marshall, 1890)Study of mankind in the ordinary business of life; examines attainment and use of material requisites of wellbeing (welfare-based).
Economics (Lionel Robbins, 1932)Science which studies human behaviour as a relationship between (multiple) ends and scarce means which have alternative uses. — most exam-quoted definition.
Positive EconomicsStudies and explains factual, testable statements about the economy ("what is").
Normative EconomicsGoes further than facts – makes value judgements and suggests solutions ("what ought to be").
MicroeconomicsStudies behaviour of individual agents – households, firms, employees; particular prices, wages, industries.
MacroeconomicsStudies the economy as a whole – national income, inflation, unemployment, growth, balance of payments.
ScarcityEconomic resources (Land, Labour, Capital, Entrepreneur) are always insufficient to satisfy all wants – the foundation of economics.
Opportunity CostThe next-best alternative forgone when a choice is made among scarce resources.
Division of LabourProducing goods/services by splitting the process into tasks carried out by different specialised workers.
3Positive vs normative – don't confuse!
| Positive Economics | Normative Economics | |
|---|---|---|
| Nature | Deals with facts/reality only | Deals with opinions & value judgements |
| Testable? | Yes – can be verified | No – cannot be proved right/wrong |
| Exam clue | "It is a fact that…", "unemployment increases poverty" | "…should be discouraged", "government should…" |
4Micro vs macro – concept relationship
Scope of microeconomics
- Commodity pricing (demand & supply theory)
- Factor pricing – "Price Theory" (rent, wages, interest, profit)
- Welfare theory – optimum resource allocation
- Answers What/How/For Whom at individual level
Scope of macroeconomics
- Economic growth & development (per-capita real income)
- National income determination
- Inflation & employment
- Balance of payments & trade
- Macroeconomic policies (monetary, fiscal, exchange rate)
Healthy macro conditions→Firms more confident to invest & hire→Individual (micro) decisions improve
Micro and Macro are interdependent: an entrepreneur's micro-level decisions are shaped by the macro-economic climate of the country.
5Agents / participants of an economy
Households – consume goods & services, supply labour, allocate scarce income.
Firms – produce goods & services, allocate scarce factors to maximise profit.
Government – allocates tax revenue & resources between social needs.
Foreign traders – exchange goods & services between economies.
6Factors of production & their rewards
| Factor | Type | Reward | Key point |
|---|---|---|---|
| Land | Non-human, passive | Rent | Natural resource; fixed in supply (Samuelson) |
| Labour | Human, active | Wages | Mental/physical effort; combines other factors |
| Capital | Non-human, man-made | Interest | Machinery, buildings, infrastructure |
| Entrepreneur | Human, active/organiser | Profit | Bears risk & uncertainty; combines all factors |
7Classification of goods
By social value
- Merit goods: positive externalities, socially desirable (education, health, parks) – may be under-produced by markets
- Demerit goods: harmful, negative externalities (e.g. alcohol)
By excludability/rivalry
- Public goods: non-rival & non-excludable (defence, roads)
- Private goods: rival & excludable (bread)
- Club goods: excludable, non-rival until congestion (golf club)
By income response
- Normal goods: demand ↑ as income ↑ (positive income elasticity)
- Inferior goods: demand ↓ as income ↑ (negative income elasticity)
- Superior goods: demand rises faster than income (elasticity >1, luxury)
Exam clue: "Inferior" refers to affordability/consumer behaviour as income changes – NOT to the physical quality of the good.
8Division of labour – why output rises
9Capital formation – 3-stage flow
Creation of savings(households forgo consumption)
→
Mobilisation of savings(via capital market/banks)
→
Investment of savings(entrepreneurs undertake ventures)
Capital formation = net accumulation of a country's capital stock over time. Consumption is inversely related to capital formation (a sacrifice of present consumption funds future capital goods).
10Needs vs wants
| Need | Want | |
|---|---|---|
| Meaning | Essential for survival | Desired but not essential for survival |
| Example | Inhaler for an asthma patient | A heavy bike; chocolate |
| If unmet | Survival threatened | Discomfort only, no survival risk |
11Opportunity cost – formula & applications
Opportunity cost of commodity X (in units of Y forgone)
OC = (Y₂ − Y₁) ÷ (X₂ − X₁)
Y = quantity of good forgone | X = quantity of good gained | Used to measure the slope/trade-off along the PPF
Opportunity cost by agent
- Households: satisfaction forgone from good A by buying good B instead
- Firms: revenue forgone by producing good A instead of good B
- Government: social need forgone (e.g. health) by funding another (e.g. education)
Cause → effect chain
- Unlimited wants + scarce resources → Scarcity
- Scarcity → forces a Choice
- Choice → next-best alternative forgone = Opportunity Cost
- Opportunity cost → shown graphically by the PPF
12Production possibility frontier (PPF)
PPF = combinations of two goods (e.g. Guns & Bread) producible when all scarce resources are used fully & efficiently.
Properties of PPF
- Downward sloping (left to right) – shows the trade-off between two goods
- Concave to origin – opportunity cost rises as more of one good is produced (law of diminishing returns + resources not equally suited to both goods)
Key assumptions
- Efficient use of resources & full employment
- Fixed quantity/quality of resources
- Only TWO goods produced
- Constant state of technology
Points A–E on the curve = full & efficient use (efficiently attainable).
13Economic growth → shift of PPF
More/better resources (investment in people, tech)→Productive potential expands→PPF shifts OUTWARD (AE → A′E′); once-unattainable point N becomes attainable
14Graph interpretation roadmap
15Economic systems – classification tree
Economic system (answers What / How / For Whom)
Capitalism (Free Market)Price mechanism, competition, private property, freedom of enterprise, self-interest. e.g. Canada, Japan
Socialism (Command)No private ownership, centrally planned, welfare state, no competition. e.g. North Korea, Cuba
Mixed EconomyPublic + private co-exist. Capitalistic Mixed (private-dominant) vs Socialistic Mixed (state-dominant). e.g. UK, Sweden, China
16Circular flow of income (2-sector model)
Firms sell goods & services to households; households supply the factors of production to firms and receive rent, wages, interest and profit in return.
17Islamic economic system vs capitalism
| Aspect | Capitalism | Islamic System |
|---|---|---|
| Wealth distribution | Full liberty; disparities & concentration | Fair/equal distribution via Zakat, Sadaqat, bequest |
| Exploitation | Common via unlimited economic freedom | Minimised – prohibits usury, gambling, speculation |
| Interest | Banks charge interest as service charge | Riba prohibited; Murabaha/Musharaka used instead |
| Monopoly | Cartelisation tolerated | Government intervenes to prevent monopoly |
| Ownership | Unrestricted private ownership | Humans are trustees; God is true owner; nationalisation supported to prevent concentration |
Key Islamic finance modes
- Mudaraba – expert invests, profits shared with capital-provider
- Musharaka – investment partnership, profit-sharing agreed in advance
- Murabaha – bank buys asset then sells to customer (deferred, no interest)
- Ijara / Ijara-wa-Iqtina – leasing (with option to buy at end)
18Exam question patterns & MCQ quick clues
"Studies human behaviour: ends vs scarce means"
→Robbins' definition
"Deals with wealth production/exchange/distribution"
→Adam Smith's definition
"Statement suggests what 'ought' to be done"
→Normative economics
"Concave curve; downward sloping; two goods"
→Production Possibility Frontier
"No private ownership, centrally planned"
→Socialism
"Demand falls as income rises"
→Inferior good
Trap: Confusing "inferior good" with "poor quality good" – inferior relates only to income-demand response.
Trap: Mixing up Positive (facts) vs Normative (opinions/should) economics in a statement.
Trap: Thinking Islamic economics bans private ownership entirely – it restricts, but allows a free market within Halal/Haram limits.
Trap: Point M (inside PPF) = inefficient use; Point N (outside PPF) = unattainable – do not reverse these.
Trap: PPF shift = economic growth/decline (change in resources/technology); movement ALONG the PPF = reallocation between the two goods, not growth.
19Complete chapter decision tree
★PRC-3 Economics – Chapter 1 in 60 seconds
- Robbins: ends vs scarce means with alternative uses.
- Positive = facts; Normative = opinions/solutions.
- Micro = individual agents; Macro = whole economy.
- Scarcity → Choice → Opportunity Cost = next-best alternative forgone.
- PPF: downward-sloping, concave; inside = inefficient, outside = unattainable; shifts outward with growth.
- 4 factors of production: Land (Rent) – Labour (Wages) – Capital (Interest) – Entrepreneur (Profit).
- Goods: Merit/Demerit, Public/Private/Club, Normal/Inferior/Superior.
- Economic systems: Capitalism (market) – Socialism (command) – Mixed (both).
- Islamic system: no Riba, Zakat-based redistribution, God as true owner, Halal/Haram limits on freedom.
20Chapter memory map
Key DefinitionsMicro vs MacroScarcity & ChoiceOpportunity CostFactors of ProductionTypes of GoodsDivision of LabourCapital FormationPPF & Its ShiftEconomic SystemsIslamic EconomicsExam Traps & MCQ Clues
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