South African Economy – Circular Flow & Limitations (Week 1)

Economic Perspective

Definition of Economics
• Study of how individuals, firms and institutions make choices to maximise satisfaction under scarcity.
• Focuses on rational allocation of limited resources to unlimited wants.
Scarcity & Choice
• Scarcity forces prioritisation; every decision implies a trade-off.
• Opportunity Cost: OC = \text{Value of next best alternative}.
– Individual example: holiday vs. car.
– Firm example: Machine A vs. Machine B.
– Government example: new school vs. new road.
Real-life prompts
• Household bond & Reserve Bank rate hike → budget impact.
• Rand–Dollar depreciation before US trip → fall in foreign purchasing power.
• Global debt crisis → portfolio risk for SA investors.
Marginal Analysis
• Decisions compare marginal benefit (MB) with marginal cost (MC).
• Optimal choice when MB = MC.
• Graphically illustrated through intersecting MB & MC curves on a quantity axis (e.g., pizzas).

Scientific Method in Economics
• Observation → hypothesis → testing → theory → policy.
Economic Principles
• Generalisations: describe typical behaviour of consumers/firms.
• Use ceteris paribus (other-things-equal) assumption to isolate variables (e.g., price–quantity demanded).
Models
• Simplified, often graphical (e.g., production-possibility curve) to reveal cause–effect.

Macroeconomics
• Studies the whole economy or large aggregates: government, households, business sector.
• Issues: growth, inflation, unemployment, fiscal & monetary policy.
Microeconomics
• Focuses on individual units: a household, firm, industry.
• Prices, output decisions, market structures.
Positive vs. Normative
• Positive statements: fact-based, testable.
• Normative statements: value-laden, “what ought to be”.

Geographical size: 1\,219\,090\,\text{km}^2.
Provincial extremes
• Northern Cape: 30\% of land; 2\% of population.
• Gauteng: 1.4\% of land; 26\% of population.
Population (2019): 58.8\,\text{million}.
• African > 80\%, Coloured \approx 9\%, White \approx 8\%, Indian/Asian < 3\%.
• Female share: 51\%.

Definition: One or more people occupying a housing unit; ultimate suppliers of all resources.
Total households: 16.2\,\text{million}.
Functional Distribution of Income
• Wages → labour.
• Rent & interest → property owners.
• Profits → owners of corporations & unincorporated businesses.
Inequality: Top 10\% spent 7.9\times more than bottom 40\% (2015).

Disposal of Household Income (after taxes & saving)
• Housing, water, electricity, gas & fuel – 24.6\%.
• Transport – 17.1\%.
• Other goods & services – 14.7\%.
• Food & non-alcoholic beverages – 12.8\%.
• Furniture & household equipment – 5.1\%.
• Clothing & footwear – 3\%.
• Communication – 2.8\%.
• Recreation & culture – 3\%.
• Education – 2.7\%.
• Restaurants & hotels – 2.4\%.
• Health – 1.4\%.
• Alcoholic beverages – 1.1\%.

Private Sector’s second pillar after households.
Key Concepts
• Plant: physical establishment.
• Firm: business organisation owning ≥1 plants.
• Industry: group of firms producing similar product.
Legal Forms
• Sole Proprietor (single owner).
• Partnership (two + owners).
• Company (private/public) – separate legal “person”, limited liability.
• Closed Corporation – company-like, ≤10 member-owners.
Principal–Agent Problem
• Owners (principals) vs. managers (agents) goal divergence.
• 1990s share-option schemes attempted alignment → unintended fraud (e.g., Enron).
• South African case: Steinhoff scandal illustrating agency abuse.

Roles
• Establish legal framework (property rights, contract enforcement).
• Provide goods & services the market undersupplies.
Goods Classification
• Private Goods: rivalry & excludability.
• Public Goods: non-rivalry & non-excludability → free-rider problem (e.g., national defence).
• Quasi-Public Goods: mixed traits; e.g., education, roads.
Reallocation via Taxation: transfer purchasing power, address externalities, redistribute income.

Two basic markets
• Resource (factor) market: households sell resources, firms buy.
• Product market: firms sell goods/services, households buy.
Four sector model: Households ↔ Firms ↔ Government ↔ Foreign.
Money & real flows are equal & opposite; leakages (taxes, saving, imports) balanced by injections (government spending, investment, exports).

Factors of Production
• Land, Capital, Labour, Entrepreneurial Ability.
• Entrepreneur combines resources, innovates, bears risk.

Assumptions: full employment, fixed resources & technology, two goods (consumer vs. capital).
Illustrative Table (pizzas vs. industrial robots)
• A: 10 pizzas, 0 robots
• B: 9, 1
• C: 7, 2
• D: 4, 3
• E: 0, 4.
Key Insights
• Any point on curve → productive efficiency.
• Points inside → unemployment/inefficiency (U).
• Points outside → unattainable given current resources.
Law of Increasing Opportunity Cost: bowed-out shape; reallocating resources raises marginal cost because resources aren’t equally adaptable.
Economic Growth: outward shift (A′, B′…) driven by more resources, better technology, or capital accumulation.

Move along PPF until MB = MC ensures allocative efficiency (society’s desired mix).
Under/overproduction seen where MB \neq MC.

Metaphor for arranging scarce resources efficiently within a market system, analogous to a plumber optimally routing pipes.