JAMB Economics 2025 Past Questions & Answers

A monopoly is a market structure where there is only one seller of a unique product with no close substitutes. This single seller has significant control over the price, making them a price maker, not a price taker. In contrast, buyers and sellers are price takers in a perfectly competitive market, not a monopoly.

Common mistake: Students often confuse the characteristics of different market structures, especially perfect competition and monopoly, leading them to incorrectly identify features.

Specialisation of labour involves dividing the production process into specific tasks, allowing workers to focus on and become highly skilled in one particular area. This leads to increased efficiency, as workers save time by not switching between tasks and become more proficient. Consequently, more goods and services can be produced in the same amount of time, thereby enhancing overall production.

Common mistake: Students might incorrectly choose option A, thinking that specialisation means becoming an expert in 'all' areas, whereas it actually means becoming an expert in a 'specific' area.

Joint supply means two products are made together from the same source, like beef and leather from a cow. If the demand for one of the goods (commodity X) increases, its price will rise, making it more profitable for producers. To make more profit from X, producers will increase its production, and because commodity Y is produced at the same time, the supply of Y will automatically increase as well.

Common mistake: Students often confuse joint supply with competitive supply, leading them to incorrectly choose option B, which describes a situation where producing more of one good means producing less of another.

A Consumers' Co-operative Society is a type of business organization formed by a group of individuals (the consumers) to buy goods in bulk at lower prices for their mutual benefit. The people who form and use the society are its members, and they are the ones who contribute the capital and therefore own the business. The primary goal is to provide services to its members, not to make a profit for outside investors.

Common mistake: Students might mistakenly choose 'A management committee' because this committee runs the day-to-day affairs of the society, but they are elected by the members and are not the actual owners.

In a free market economy, also known as a capitalist economy, resources are primarily allocated through the price mechanism. This means that prices, determined by the forces of supply and demand, act as signals to producers and consumers, guiding decisions on what to produce, how much to produce, and for whom. The government's role in resource allocation is minimal in such an economy.

Common mistake: Students might mistakenly choose options A or B if they confuse a free market economy with a command or centrally planned economy, where the government or a state planning committee allocates resources.

Privatization is a government policy that involves transferring ownership and control of state-owned enterprises to private entities. The primary goal is to reduce government involvement and allow private sector efficiency. Therefore, the idea that the government would still control privatized businesses contradicts the very essence of privatization and is not an argument in its favour.

Common mistake: Students might mistakenly choose an option that is actually an argument for privatization if they misread the question asking for what is 'not' an argument.

The Nigerian Industrial Development Bank (NIDB) was specifically established to foster industrial growth and development within Nigeria. Its core mandate involved providing financial assistance, primarily in the form of loans, to businesses engaged in manufacturing and other industrial activities. Therefore, manufacturers were the primary beneficiaries of its loan facilities.

Common mistake: Students might mistakenly choose farmers (C) if they confuse NIDB with other development banks like the Nigerian Agricultural and Cooperative Bank (NACB), which focuses on agriculture.

Net migration is a demographic concept that measures the overall change in a country's population due to movement across its borders. It is precisely defined as the difference between the number of immigrants (people entering the country) and emigrants (people leaving the country). This calculation helps determine whether a population is growing or shrinking due to external movement.

Common mistake: Students might incorrectly choose option B, confusing net migration with the broader categories of internal and external migration, rather than its specific definition as the balance between those entering and leaving a country.

The equation X = a + bY represents a linear relationship between the variables X and Y. In this form, 'a' is the intercept (where the line crosses the X-axis if Y=0, or Y-axis if X=0 depending on how it's plotted) and 'b' is the slope of the line. Therefore, when plotted on a graph, this function will always produce a straight line.

Common mistake: Students might incorrectly choose other options like quadratic or exponential if they do not recognize the standard form of a linear equation, which is fundamental to understanding economic graphs like demand or supply curves.

The balance of trade specifically refers to the difference between a country's visible exports (physical goods sold to other countries) and its visible imports (physical goods bought from other countries). It measures the net flow of goods between a country and the rest of the world. Option D accurately captures this definition by focusing on visible exports and imports.

Common mistake: Students often confuse 'balance of trade' with the broader 'balance of payments' or 'current account balance', which includes both visible and invisible (services) trade, leading them to incorrectly choose option B.