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Economics 3% exam weight

Introduction to Economics

Part of the ICAN (Nigeria) study roadmap. Economics topic econom-001 of Economics.

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Introduction to Economics

🟢 Lite — Quick Review (1h–1d)

Rapid summary for last-minute revision before your ICAN exam.

Economics is the social science that studies how scarce resources are allocated among competing wants. The central problem of economics is scarcity, which forces every agent — household, firm, government — to make a choice, and every choice carries an opportunity cost: the value of the next-best alternative forgone.

  • Microeconomics studies individual agents (consumers, firms, markets); macroeconomics studies the whole economy (inflation, GDP, unemployment).
  • Factors of production are land (reward = rent), labour (reward = wages/salary), capital (reward = interest), and entrepreneurship (reward = profit).
  • Law of demand: as price rises, quantity demanded falls (movement along the curve). A change in demand is a shift of the whole curve caused by income, tastes, prices of related goods, expectations or number of buyers.
  • Market equilibrium occurs where Qd = Qs. PED = %ΔQ ÷ %ΔP and is reported as an absolute value.
  • PPC/PPF illustrates scarcity, choice and opportunity cost; outward shift signals economic growth.

🟡 Standard — Regular Study (2d–2mo)

Standard content for students with a few days to months of preparation.

Definition, Scope and the Central Problem

Economics analyses how individuals, firms and governments allocate scarce resources to satisfy unlimited wants. Because resources are limited but wants are not, society must choose between alternatives, and every choice implies an opportunity cost measured in real resources forgone, not only in naira. The subject splits into microeconomics (individual markets, consumer behaviour, firm theory) and macroeconomics (aggregate output, inflation, employment, balance of payments).

Wants, Goods and Economic Systems

Wants are classified as necessities, comforts or luxuries, and as individual versus collective (public) wants. Goods divide into free goods (air, sunlight — no opportunity cost) and economic goods (scarce, require a price). Modern economies are predominantly mixed, combining the price mechanism of markets with state intervention to address the four basic questions: what, how, for whom and when to produce.

Demand, Supply and Elasticity

The demand function is Qd = f(P, Y, Pr, T, N) (own price, income, prices of related goods, tastes, number of buyers). The supply function is Qs = f(P, Pi, T, E, G) (own price, input prices, technology, expectations, government policy). Equilibrium is where Qd = Qs; disequilibrium creates shortages or surpluses.

ConceptFormula / Point
Price Elasticity of DemandPED = (%ΔQ) / (%ΔP), reported as absolute value
Income Elasticity of DemandYED = (%ΔQ) / (%ΔY); positive for normal goods
Cross Elasticity of DemandXED = (%ΔQa) / (%ΔPb); positive for substitutes, negative for complements
Movement vs ShiftMovement ALONG the curve from ΔP; shift from non-price determinants

Production Possibility Frontier

The PPF (aX + bY = C) shows the maximum feasible combinations of two goods. Points on the curve represent efficient use of resources; inside the curve, under-utilisation; outside, unattainable with current resources. An outward shift indicates economic growth from higher factor supplies or improved technology.

Common ATS Pitfalls

  • Confusing scarcity (permanent) with shortage (temporary, price-driven).
  • Writing opportunity cost in money terms only — ICAN expects the real alternative forgone.
  • Labelling a change in quantity demanded as a change in demand.

🔴 Extended — Deep Study (3mo+)

Comprehensive coverage for students on a longer study timeline.

Factors of Production and Remuneration

Production requires four factors, each paid according to its marginal productivity. Land is fixed in supply and earns rent; labour is human effort and earns wages; capital is man-made aid to production and earns interest; entrepreneurship (the residual claimant who organises the other three) earns profit, which may be negative in the short run. ICAN questions often ask candidates to pair each factor with both its reward and a practical example.

Cost, Revenue and Market Structures (Introductory Depth)

In the short run, Total Cost (TC) = Total Fixed Cost (TFC) + Total Variable Cost (TVC); the corresponding averages are AFC, AVC and ATC. Marginal Cost (MC) = ΔTC ÷ ΔQ. Four market structures are tested at Foundation level: perfect competition (many sellers, homogeneous product, price-taker), monopoly (single seller, price-maker, high barriers), monopolistic competition (many sellers, differentiated products) and oligopoly (few large sellers, interdependent strategies).

National Income at First Pass

AggregateDefinition
GDPMarket value of output produced within a country in a year
GNPGDP + Net Factor Income from Abroad (NFIA)
NNPGNP − Depreciation (capital consumption allowance)
Nominal vs RealNominal = current prices; Real = constant base-year prices (controls for inflation)

GDP is measured three ways — output, income and expenditure — which must, by identity, give the same total.

Connections and Practice Prompts

  • Link utility theory to demand: the law of diminishing marginal utility underpins the downward-sloping demand curve.
  • Link elasticity to revenue: when PED > 1, a price cut raises total revenue; when PED < 1, it lowers revenue.

Practice prompts:

  1. Draw a PPF for guns and butter showing (a) unemployment, (b) efficient production, (c) growth, and explain opportunity cost along the curve.
  2. Price rises from ₦200 to ₦240 and quantity demanded falls from 500 to 400 units. Compute PED using the midpoint formula and comment on revenue implications.

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