GCE Economics
Past Questions

AI Explanation

The four factors of production are land, labour, capital, and entrepreneurship. Money in a savings account is a financial asset, not a real productive resource — it is not itself used to produce goods and services. A tractor is physical capital, a skilled engineer is labour, and a plot of land is the factor 'land'.

AI Explanation

The PPC is concave (bowed outward) because resources are not perfectly adaptable between uses. As more of one good is produced, increasingly less suitable resources must be transferred from the other good, causing the opportunity cost of each additional unit to rise — this is the law of increasing opportunity cost. Diminishing marginal utility applies to consumption, not production possibility.

AI Explanation

Scarcity refers to the fundamental economic problem that resources (land, labour, capital, and entrepreneurship) are finite while human wants are unlimited. This forces individuals and societies to make choices about how to allocate available resources. It is not limited to money or poverty but applies universally to all economies.

AI Explanation

An outward shift of the PPC represents economic growth, meaning the economy can now produce more of all goods than before. This is caused by factors such as technological advancement, discovery of new resources, or an increase in the labour force — all of which expand productive capacity. Price levels and income redistribution do not shift the PPC.

AI Explanation

Opportunity cost is the value of the next best alternative forgone when a choice is made. The student gives up two hours of part-time work at ₦3,000 per hour, so the opportunity cost is ₦3,000 × 2 = ₦6,000. Option A incorrectly uses only one hour, while C and D misrepresent the concept.

AI Explanation

A traditional economy is characterised by production based on customs, habits, and traditions, where output is primarily for self-consumption rather than exchange. Subsistence farming, where the farmer produces only for personal or family use, is the classic example. Market economies rely on price mechanisms, while command economies involve central planning.

AI Explanation

A point inside the PPC represents productive inefficiency, meaning the economy is not using all its available resources — some are idle or underemployed (e.g., unemployed labour or idle capital). A point on the PPC represents full productive efficiency. A point beyond the PPC is currently unattainable. The trade-off described in option D only applies when operating on the PPC, not inside it.

AI Explanation

In a free market economy, the price mechanism determines resource allocation. The question of 'for whom to produce' is answered by consumers' ability to pay — goods and services go to those who have the income and purchasing power to demand them. Government directives and national plans are features of command economies.

AI Explanation

Derived demand refers to demand for a good or factor of production that arises because of its use in producing another good or enabling another activity. Petrol is not demanded for its own sake but because car owners need it to operate their vehicles, making it a derived demand. Joint demand refers to goods demanded together, while competitive demand involves substitutes.

AI Explanation

A rightward shift in the demand curve occurs due to a change in a non-price determinant of demand. When the price of groundnut oil (a substitute) rises, consumers switch to the relatively cheaper palm oil, increasing demand for palm oil and shifting the curve rightward. Changes in the price of palm oil itself cause movement along the curve, not a shift.

AI Explanation

Cross elasticity of demand measures the responsiveness of demand for one good to a change in the price of another. A negative cross elasticity indicates that when the price of Y rises, demand for X falls, which is the characteristic of complementary goods (goods used together). Substitutes have positive cross elasticity, while independent goods have zero cross elasticity.

AI Explanation

PES = (% change in quantity supplied) ÷ (% change in price). % change in quantity supplied = (300/1000) × 100 = 30%. % change in price = (100/500) × 100 = 20%. PES = 30% ÷ 20% = 1.5. Since PES > 1, supply is elastic, meaning producers are relatively responsive to the price increase.

AI Explanation

An increase in the wage rate raises the cost of production for the cassava processing factory. Higher production costs reduce the profitability of supplying processed cassava at every price level, causing the supply curve to shift leftward (decrease in supply). This is a change in a non-price determinant of supply, so it shifts the entire curve rather than causing a movement along it.

AI Explanation

Price elasticity of supply (PES) = (% change in quantity supplied) ÷ (% change in price). % change in quantity supplied = (100/400) × 100 = 25%. % change in price = (500/2000) × 100 = 25%. Therefore PES = 25% ÷ 25% = 1.0, indicating unit elastic supply.

AI Explanation

Perfectly inelastic supply means that the quantity supplied does not change regardless of the price level, giving a price elasticity of supply equal to zero. This is represented graphically by a vertical straight line parallel to the price axis. A horizontal supply curve represents perfectly elastic supply.

AI Explanation

Using the midpoint method: % change in Qd = (30−20)/[(30+20)/2] × 100 = 10/25 × 100 = 40%. % change in Price = (6−8)/[(6+8)/2] × 100 = −2/7 × 100 ≈ −28.57%. PED = 40% ÷ 28.57% ≈ 1.40 (taking absolute value). This indicates elastic demand, meaning consumers are relatively responsive to the price change.

AI Explanation

A price ceiling is a maximum price set below the equilibrium price. At ₦40,000, which is below the equilibrium of ₦50,000, the quantity demanded will exceed the quantity supplied, creating a shortage. Suppliers are unwilling to supply as much at the lower price, while consumers demand more at the reduced price.

AI Explanation

When demand is price elastic (PED > 1), a fall in price leads to a proportionately larger increase in quantity demanded, causing total revenue to rise. If PED < 1, total revenue falls when price falls. At unitary elasticity, total revenue remains constant when price changes.

AI Explanation

Perfectly inelastic demand means consumers buy the same quantity regardless of price changes. Insulin is a life-sustaining drug for diabetics who have no substitute and must consume it irrespective of price, making its demand closest to perfectly inelastic. The other goods have readily available substitutes or are non-essential.

AI Explanation

Income elasticity of demand (YED) measures the responsiveness of quantity demanded to a change in consumer income. A negative YED indicates that as income rises, demand for the commodity falls, which is the defining characteristic of an inferior good. Normal goods have positive YED, while luxury goods have YED greater than 1.

AI Explanation

Cross price elasticity of demand = % change in Qd of Y / % change in price of X = 15/10 = +1.5. A positive cross elasticity indicates that X and Y are substitutes; as the price of X rises, consumers switch to Y, increasing its demand. Complements have negative cross elasticity.

AI Explanation

PED = (% change in quantity demanded) / (% change in price). % change in Qd = (80-100)/100 × 100 = -20%. % change in P = (250-200)/200 × 100 = 25%. PED = 20/25 = 0.8. Since the absolute value is less than 1, demand is inelastic.

AI Explanation

% change in Qd = (350 - 500)/500 × 100 = -30%. % change in P = (18,000 - 15,000)/15,000 × 100 = 20%. PED = 30/20 = 1.50. Since PED > 1, demand is elastic, meaning consumers are relatively sensitive to the price change. Distractor A (1.25) and C (1.75) reflect common arithmetic errors in computing percentage changes.

AI Explanation

Perfectly elastic supply (PES = ∞) means that at the prevailing price, suppliers are willing to supply any quantity, but even the slightest fall in price would cause supply to drop to zero. This is represented by a horizontal supply curve. Option B describes perfectly inelastic supply, and option C describes unitary elastic supply.

AI Explanation

Demand is more inelastic when a good is a necessity and has no close substitutes, because consumers must continue to buy it even when its price rises. Many close substitutes (option A), a long adjustment period (option B), and a large budget share (option C) all tend to make demand more elastic.