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The law of diminishing returns (also known as the law of variable proportions) states that as successive units of a variable input (labor) are added to a fixed input (factory size), the marginal product will eventually decline. This affects the total, average, and marginal products as the firm's output increases in the short run. Returns to scale, on the other hand, describes the long-run relationship between a proportional change in all inputs and the resulting change in output.

A pure monopoly exists when a single firm is the sole seller of a product with no close substitutes, and there are significant barriers to entry for new firms. The electricity company, by having exclusive rights to distribute power in a specific area, fits the definition of a pure monopoly.

Graphical tools like bar charts, pie charts, and line graphs are used to visually represent economic data, making trends and comparisons easier to understand. This is a basic tool of economic analysis.

Structural unemployment arises from a mismatch between the skills of the unemployed workers and the skills needed for available jobs. In Nigeria, this is a common issue as the educational system may not produce graduates with the technical or vocational skills demanded by the labor market, leading to a surplus of workers in certain fields while there are shortages in others.

A sole proprietorship is a business owned and run by one individual. Its key advantage is the ease and low cost of setting it up, as well as the owner having full control over all decisions. However, a major disadvantage is unlimited liability, where the owner is personally responsible for all business debts.

Scarcity is a core economic problem that arises because human wants are unlimited, but the resources available to satisfy them are limited. This forces individuals and societies to make choices about which wants to satisfy and which to forgo. The decision of what to consume is a direct consequence of this scarcity.

Non-tax revenue consists of government income from sources other than taxes. These include fees, fines, licenses, and, in Nigeria's case, royalties and rents from oil and gas exploitation. The other options are all forms of tax revenue.

A normative statement is an opinion-based statement that includes a value judgment about what "should" or "ought" to be. It is not testable and cannot be proven or disproven. A positive statement, on the other hand, is a testable, factual statement about "what is."

A progressive tax system is one where the tax rate increases as the taxable amount increases. The primary purpose of this system is to promote equity by making high-income earners pay a larger percentage of their income in taxes than low-income earners.

Inelastic demand means that a change in price leads to a proportionately smaller change in quantity demanded. Since fuel is a necessity for transportation and generators, people will continue to buy it even if the price increases, though perhaps in slightly smaller quantities.

Open market operations, which involve the buying and selling of government securities, are a key tool of monetary policy. When the central bank wants to reduce the money supply, it sells securities to commercial banks. The banks pay for these securities with their reserves, which reduces the amount of money they have available to lend out, thereby contracting the money supply and curbing inflation.

The International Monetary Fund (IMF) is an international organization that provides financial assistance and advice to countries facing balance of payments problems or seeking to implement economic reforms. Its relevance to Nigeria lies in its role in helping to stabilize the country's economy and manage its foreign exchange challenges, although this assistance often comes with conditions for policy changes.

Contractionary monetary policy is an economic strategy used by a central bank to slow down an economy or combat inflation. It involves reducing the money supply and increasing interest rates, making borrowing more expensive and discouraging spending. The aim is to reduce the amount of money available for consumption and investment, thereby cooling down the economy and reducing price pressures.

The Dutch disease is an economic concept that describes a phenomenon where the rapid development of one sector (in Nigeria's case, the oil sector) leads to a decline in other sectors, particularly the non-oil sector like agriculture and manufacturing. This occurs because the booming resource sector causes the country's currency to appreciate, making its non-oil exports less competitive internationally and its imports cheaper.

An extension of supply is an increase in the quantity supplied of a good in response to an increase in its price. This is represented by an upward movement along the existing supply curve.

The marginal productivity theory of wages posits that the wage rate of a factor of production, like labor, is determined by its marginal revenue product, that is, the additional revenue generated by employing one more unit of that factor. When the new technology makes workers more productive, their marginal product increases, justifying a higher wage.

A census is a complete count of a population at a specific time, and its importance is that it provides data for planning and policy-making. However, collecting this data in Nigeria is fraught with challenges, including logistical issues, the high cost, cultural beliefs, and political manipulation, all of which compromise the accuracy and reliability of the data.

A tariff is a tax imposed by a government on imported goods. The purpose of a tariff is to increase the price of imports, making them less competitive compared to domestically produced goods, thereby protecting local industries.

The key difference between perfect and imperfect markets lies in the degree of product differentiation and the presence of barriers to entry and exit. In a perfectly competitive market, the product is homogeneous, and there are no barriers. In imperfect markets (monopoly, oligopoly, monopolistic competition), firms have some control over price due to product differentiation and/or barriers to entry.

Gross Domestic Product (GDP) measures the total market value of all final goods and services produced within a country's geographical boundaries during a specific period. It is a key indicator of a nation's economic health and is different from GNP, which includes income earned by citizens abroad.