Introducing Economics, Economic Problems, Resources & Markets – Comprehensive Exam Notes
Unit 1 – Introducing Economics
1.1 Meaning, Definition & Nature of Economics
Etymology & Early Focus
Greek term oikonomia → “management of a household”.
Initially studied in ancient Greece; now a core social science.
Contemporary Relevance
Worldwide issues: poverty, unemployment, inflation, recession, population explosion.
Studying economics develops logical thinking, analytical, observational & judgement skills.
Modern Working Definition
“Economics is a branch of social science that studies the efficient allocation of scarce resources so as to attain the maximum fulfilment of unlimited human needs.”
Key Ideas Embedded in the Definition
Resources are scarce.
Allocation must be efficient.
Human needs/wants are unlimited.
Economics as a Science
Systematic body of knowledge; collects, analyses & interprets facts to link causes & effects ("what is").
Economics as an Art
Provides techniques & prescriptions to tackle problems (unemployment, poverty, inflation) – “how to achieve”.
Thus economics is both science and art.
1.2 Branches of Economics
Microeconomics
Studies individual decision-making units (households, firms, government) and their interaction in specific markets.
Central problem: resource allocation / price determination.
Tools: individual demand & supply.
Macroeconomics
Studies the economy as a whole; focuses on aggregate variables (GDP, national income, total employment, general price level, aggregate investment & consumption).
Central problem: full employment & aggregate income determination.
Tools: aggregate demand & aggregate supply.
Complementarity: Neither branch can be studied in isolation – micro foundations for macro, macro context for micro.
Illustrative Difference
Pricing of teff (micro) vs. movement in overall Consumer Price Index (macro).
1.3 Methods & Approaches of Studying Economics
Logical Methods
Deductive Method – reasoning from general → particular. E.g. “All men are mortal; Abebe is a man ⇒ Abebe is mortal.”
Inductive Method – reasoning from particular → general; builds theory from observed data. E.g. Lower grain prices every harvest ⇒ “↑Supply → ↓Price (ceteris paribus)”.
Complementary, not competing.
Analytical Approaches
Positive Economics: fact-based, value-free; asks what is / was / will be.
"Number of secondary schools is increasing".
Normative Economics: value judgements; asks what ought to be.
"Government should feed all school children".
Disputes over positive statements resolved via facts; disputes over normative statements via voting or ethical debate.
1.4 Decision-Making Units (Economic Agents)
Households
Owners of factors of production; earn rent, wages, interest, profit.
Spend on goods & services; also pay taxes & save.
Business Firms / Producers
Hire factors, transform them into commodities; sell to households, other firms, government, rest-of-world.
Government (General Government)
Purchases goods/services & factor services to provide collective services (police, education, health).
Financed mainly through compulsory taxes (direct & indirect).
Unit 2 – Basic Economic Problems & Economic Systems
2.1 Scarcity, Choice & Opportunity Cost
Scarcity: Finite resources vs. infinite wants → perpetual imbalance. Not the same as shortage (temporary inability to obtain at current price).
Choice: Because of scarcity, society must select which wants to satisfy → implies cost.
Opportunity Cost (OC)
Value of next-best alternative forgone.
Measured in real terms (goods/services), not money.
Example: If 1 m of cloth ↔ 20 computers, then OC_{cloth}=20\text{ computers}.
Production Possibility Frontier (PPF/PPC)
Graph of maximum feasible output combinations of two goods given resources & technology.
Assumptions: fixed resources/tech, two goods, full employment & production, resources not perfectly adaptable.
Points: On curve = efficient; inside = attainable but inefficient; outside = unattainable.
Shows scarcity (finite frontier), choice (movement along), opportunity cost (slope).
Law of Increasing Opportunity Cost: Concave shape; specialised resources ⇒ rising OC per extra unit.
Economic Growth: Outward shift via ↑resource quantity/quality or technological progress (symmetric or asymmetric).
2.2 Central (Basic) Economic Questions
What to produce? (resource allocation across goods).
How to produce? (choice of technique – labour-intensive vs capital-intensive).
For whom to produce? (distribution of output / income).
Affect individuals (personal consumption), firms (production mix), society (equity & efficiency).
2.3 Economic Systems
Definition: Institutional arrangement for answering the three basic questions; distinguished mainly by ownership of resources.
a) Traditional / Subsistence Economy
Guided by customs, history, kinship.
Activities: hunting, gathering, pastoralism, small-scale farming; heavy reliance on barter.
Generally found in rural parts of developing regions; limited surplus, minimal technology.
b) Capitalist / Free-Market / Laissez-Faire Economy
Private ownership of means of production.
Consumer sovereignty & profit motive drive production.
Competition among buyers & sellers; minimal government role (law, order, defence).
Tends toward income inequality.
c) Command / Socialist Economy
Collective (state) ownership of resources.
Central planning allocates resources; sets output, prices, wages.
Seeks relative income equality, but limits consumer choice & private initiative.
Historical examples: former USSR, Mao-era China, Derg-era Ethiopia.
d) Mixed Economy
Combines private & public sectors.
Strategic industries in public hands; consumer goods in private.
Employs economic planning, regulation & redistribution to curb inequalities while preserving market incentives.
Modern Ethiopia operates largely as a mixed system (state land ownership + growing private sector).
Unit 3 – Economic Resources & Markets
3.1 Types of Resources & Factor Payments
Free Resources: Unlimited at zero price (air, sunlight).
Economic (Scarce) Resources: Limited supply; command a price.
Land – all natural resources; payment: rent.
Labour – human effort (physical & mental); payment: wages.
Capital – produced means of production (machines, tools, infrastructure); payment: interest.
Entrepreneurship – organisation & risk-bearing; payment: profit.
3.2 Renewable vs Non-Renewable Resources & Conservation
Renewable Resources: Naturally replenished (solar, wind, timber, groundwater, soil).
Renewal speed varies (sunlight daily; soil centuries).
Non-Renewable Resources: Fixed stock; depletion inevitable (coal, oil, natural gas, metallic ores).
Recycling can slow exhaustion but not expand stock.
Conservation Strategies
Reduce (use less), Reuse, Recycle.
Pollution control to protect both resource types.
3.3 Market Types
Market (general): Any mechanism/space (physical or digital) where buyers & sellers exchange goods/services.
Goods & Services Market: Households purchase consumption goods from firms (stores, e-commerce).
Labour Market: Workers supply labour; firms demand labour; wage determination.
Financial Market: Trading of securities, currencies, bonds; provides liquidity & capital (stock exchange, bond market).
3.4 Circular Flow of Economic Activities
Concept: Continuous movement of real resources & money among economic agents.
Flows
Real Flow: Factors → Firms; Goods & Services → Households.
Money Flow: Wages/rent/interest/profit → Households; Consumption expenditure → Firms.
Two-Sector Model (Closed, private)
Agents: Households & Firms.
Assumes: no savings, no government, no foreign trade.
Inner circle (real), outer circle (money).
Three-Sector Model (Addition of Government)
Government collects taxes from households & firms; spends on goods, services & transfers.
Introduces savings–investment link via capital market; transfers & subsidies modify flows.
3.5 Land as an Economic Resource in Ethiopia
Magnitude & Potential
Total area ≈ 1{,}106{,}000\,\text{km}^2; ~35 % considered agriculturally suitable.
Major Highland Soil Types
Red / Reddish-Brown Soils – mineral-rich, well-drained, friable, highly cultivable.
Brown-to-Grey & Black Clay Soils – high fertility with proper drainage; excellent for cereals & pulses.
Agro-Climatic Diversity: Altitude-induced zones allow varied crop portfolio, enhancing export potential.
Land Tenure Evolution
1975: "Land to the Tiller" revolution replaced feudal holdings with state ownership.
Post-1991 FDRE: State retains land ownership; peasants hold lifelong “use rights” (can’t sell/mortgage). Urban land held via 99-year lease system.
Issues: Limited transferability, restricted rental/lease markets, compensation below market value during expropriation; ongoing debates on reform for security & efficiency.
Cross-Unit Connections & Implications
Scarcity & opportunity cost underpin every unit: from defining economics (Unit 1) to allocating land (Unit 3).
Decision-making agents (households, firms, government) appear in circular-flow analysis and recur when comparing economic systems.
Ethical & practical considerations (positive vs normative, equity vs efficiency) influence policy choices: e.g., land tenure, conservation, mixed-economy design.
Mathematical representations:
Opportunity cost ratios, OC=\frac{\Delta Y}{\Delta X} on PPF.
GDP & aggregate measures in macro analysis.
Real-world relevance:
Ethiopia’s quest for sustainable growth depends on managing scarce resources (land, capital), choosing appropriate techniques (labour-intensive vs capital-intensive), and balancing roles of state & market within its mixed economic framework.