JAMB Economics 2023 Past Questions & Answers

A tariff is a specific type of tax imposed by a government on goods and services that are imported from other countries. This is often done to protect local industries from foreign competition or to generate revenue. Therefore, tariffs are directly linked to imported goods.

Common mistake: Some students might mistakenly think tariffs apply to exported goods or all consumer goods, but their primary application is on goods brought into a country.

Price inelastic demand means that the quantity demanded changes very little even when the price changes significantly. This happens when the calculated price elasticity of demand (PED) coefficient is between 0 and 1 (i.e., less than one in absolute terms). A value less than one indicates that the percentage change in quantity demanded is smaller than the percentage change in price.

Common mistake: Students might mistakenly choose D (greater than one), which describes elastic demand, or C (negative), which is generally true for demand but doesn't define inelasticity specifically.

A free good is a good that is so abundant that its supply exceeds demand at a zero price, meaning it has no opportunity cost. Water in the ocean is naturally plentiful and does not require scarce resources for its existence, fitting this definition. Other options involve scarce resources or costs, even if not directly paid by the consumer.

Common mistake: Students often confuse 'free' in everyday language (like free education or a free dinner) with an economically free good, which has no opportunity cost.

The marginal propensity to consume (MPC) is a key concept in national income determination, measuring the proportion of an aggregate raise in pay that a consumer spends on the consumption of goods and services. It is calculated as the change in consumption (ΔC) divided by the change in disposable income (ΔY), which is option B. The MPC also represents the slope of the consumption function, making option C correct. Furthermore, in a consumption function like C = C₀ + cYd (where C₀ is autonomous consumption and Yd is disposable income), 'c' is the coefficient representing the MPC, making option D correct. Since B, C, and D are all correct descriptions of MPC, option A, which implies all three are correct, is the right answer.

Common mistake: Students might incorrectly choose only one of B, C, or D if they do not recognize that all three options are valid definitions or representations of the marginal propensity to consume, or if they misinterpret the collective option A.

The short run in economics is defined as a period where at least one factor of production (like machinery or land) is fixed, while others (like labor or raw materials) can be varied. This allows firms to adjust output by changing only their variable inputs. Option B correctly captures this essential characteristic, distinguishing it from the long run where all inputs are variable.

Common mistake: Students often confuse the short run with the long run, mistakenly thinking that all inputs are fixed (Option A) or all are variable (Option D).

The velocity of money measures the rate at which money is exchanged from one transaction to another within an economy. It indicates how many times a unit of currency is used to purchase goods and services over a specific period. Option D correctly defines it as the ratio of real GDP to the real money supply, which is mathematically equivalent to nominal GDP divided by the money supply (MV = PQ).

Common mistake: Students often confuse the components or the order of the ratio, leading them to select options that represent the inverse or an unrelated calculation, such as option A.

Income after tax is called disposable income, which is the money available for a person to use. This money can be used in two ways: it can be spent on goods and services (consumption) or it can be kept for future use (saving). Therefore, the part of disposable income that is not consumed is, by definition, saving.

Common mistake: Students may confuse saving with 'Capital investment', but saving is simply the act of not spending income, whereas investment is the use of those savings to purchase assets.

In economics, an industry is defined as a group of firms that produce similar or closely related goods or services. This concept is foundational to understanding different market structures, such as perfect competition, monopoly, or oligopoly, which categorize industries based on their characteristics. Option C accurately reflects this standard economic definition.

Common mistake: Students might incorrectly choose option A, confusing the general definition of an industry with a specific characteristic of firms in certain market structures, like monopolistic competition where products are differentiated.

Structural unemployment occurs due to long-term changes in the structure of an economy, which makes certain skills obsolete or no longer needed. When an individual's skills become outdated, for example, due to new technology, they face structural unemployment because there is a mismatch between their abilities and the jobs available. This is exactly what the question describes.

Common mistake: Students might confuse this with frictional unemployment, but frictional unemployment is temporary and happens when a person is in-between jobs, not because their skills are no longer useful.

The theory of Absolute Advantage was propounded by Adam Smith in his 1776 book, 'The Wealth of Nations'. This theory states that a country should specialize in and export goods which it can produce more efficiently (i.e., with fewer resources) than other countries. The correct option correctly pairs the theory of Absolute Advantage with its originator, Adam Smith.

Common mistake: Students often confuse the theories of Absolute and Comparative Advantage, mistakenly associating David Ricardo with Absolute Advantage when he is actually the proponent of Comparative Advantage.