Economics 2024 Jamb Examination

The diagram depicts a downward-sloping curve showing an inverse relationship between two variables.
In labour economics, an inverse relationship between wage rate and unemployment is represented by the Phillips curve.
The Phillips curve demonstrates that when wage rates rise, unemployment tends to fall, and vice versa.
Thus, the diagram aligns with the relationship between wage rate and unemployment.

Internal trade takes place within a country and, unlike international trade, does not face natural barriers such as differences in language, currency, or geographical separation.
Bargaining, trade unions, and lack of specialisation can occur within domestic markets, but natural barriers are external constraints typically associated with international trade.
Therefore, natural barriers are not associated with internal trade problems.

When a data set is arranged either in ascending or descending order, the middle value is known as the median.
The mean represents the arithmetic average, the mode is the most frequently occurring value, and variance measures the degree of dispersion.
The only measure that refers specifically to the middle term is the median.

An exceptional demand curve refers to the rare case where quantity demanded rises as price increases, contradicting the law of demand.
This may occur when consumers expect prices to rise in the future, causing them to buy more now despite higher prices.
Changes in taste, population size, or cost of raw materials do not produce an upward-sloping demand curve.
Therefore, the condition that leads to an exceptional demand curve is the expectation of future price increase.

Price elasticity of demand is computed using the percentage change in quantity demanded divided by the percentage change in price.

Change in quantity demanded:\[ 100 - 80 = 20 \]Percentage change in quantity:\[ \dfrac{20}{100} = 0.2 \]
Change in price:\[ 10 - 8 = 2 \]Percentage change in price:\[ \dfrac{2}{8} = 0.25 \]
Elasticity:\[ \text{Elasticity} = \dfrac{0.2}{0.25} = 0.8 \]The elasticity is less than 1, indicating inelastic demand.

The expenditure approach measures national income by summing total spending on final goods and services in an economy.
This includes consumption (C), investment (I), government expenditure (G), and net exports (X - M).
The correct form is therefore: \(Y = C + I + G + (X - M)\).
Only option B correctly includes consumption, investment, government expenditure, and net exports in their appropriate positions.

Consumer equilibrium is achieved when the marginal utility of a commodity equals its price.
This condition implies that the consumer has allocated income in such a way that utility is maximised, and no further adjustment is necessary.
It does not imply that total utility equals price, nor that more of the commodity must be consumed.
Therefore, the equality of marginal utility and price indicates consumer equilibrium.

Equilibrium wage occurs at the intersection of the demand and supply curves for labour.
On the diagram, the intersection aligns horizontally with wage level W2, indicating the wage at which the quantity of labour supplied equals the quantity of labour demanded.
Other points, such as W1 or the labour quantities L2 and L3, do not represent the equilibrium point.
Thus, the equilibrium wage rate shown is W2.

An indifference curve shows different combinations of two goods that provide a consumer with the same level of satisfaction.
Opportunity curves are associated with production and trade-offs, not consumer satisfaction.
Utility curves show total utility, and demand curves show the relationship between price and quantity demanded.
The graph that captures equal satisfaction combinations is the indifference curve.

Per capita income measures average income per person and is the most widely used indicator for comparing standards of living between countries.
Total national income figures, such as Gross or Net National Income, do not account for population differences.
Net disposable income is useful within a country but not ideal for international comparison.
Hence, per capita income provides a fair basis for comparing living standards between Nigeria and Ghana.