JAMB Economics 2017
Questions & Answers

Distractor check: Students might select the production of goods only or the distribution of money, overlooking that economics covers a broader range of societal resource issues. Reasoning to the answer: The field of economics investigates how scarce resources are allocated in order to satisfy unlimited human wants, giving attention to consumption, distribution, and production. Common mistake: Mistaking a single economic activity, like money distribution or goods production, for the entire scope of the discipline.

Distractor check: A student might mistakenly select the monetary cost of a good, confusing out-of-pocket expenses with economic trade-offs. Reasoning to the answer: Making a choice involves sacrificing the best alternative option, and the value of that sacrificed choice represents the opportunity cost, such as choosing time spent studying instead of working. Common mistake: Confusing explicit financial outlays with the hidden value of foregone alternatives.

Distractor check: A student might incorrectly choose feudalism and communism, associating historical or extreme systems rather than the modern structures. Reasoning to the answer: A mixed economy combines private enterprise, representing capitalism, with government intervention, representing socialism, as can be observed in Nigeria. Common mistake: Failing to recognize which specific economic models are fused together in a mixed economic system.

Distractor check: A student might choose limited wants and abundant resources, which describes an imaginary utopia rather than a real economic environment. Reasoning to the answer: The fundamental economic problem arises because unlimited human wants clash with limited resources, which forces society to make choices. Common mistake: Inverting the relationship between human desires and available resources.

Distractor check: A student might select inflation rates or government revenue, mixing up general macroeconomic indicators with microeconomic production boundaries. Reasoning to the answer: The production possibility curve displays the maximum combinations of two goods an economy can create, which emphasizes trade-offs and opportunity costs. Common mistake: Mistaking the production possibility curve for a chart tracking price inflation or public sector income.

Distractor check: A student might pick facts and data, confusing normative statements with objective, data-driven positive economic statements. Reasoning to the answer: Statements that express opinions or what ought to be, such as arguing that the government should reduce taxes, are classified as normative because they rely on value judgments rather than purely factual data. Common mistake: Confusing subjective value judgments with objective, fact-based economic claims.

Distractor check: A student might select higher prices lead to higher quantity demanded, confusing consumer behavior with the law of supply. Reasoning to the answer: According to the law of demand, lower prices lead to higher quantity demanded, and vice versa, assuming ceteris paribus holds true. Common mistake: Mixing up the inverse price-quantity relationship of demand with the direct relationship found in supply.

Distractor check: A student might select inelastic demand, mixing up how easily consumers can find alternative products in the market. Reasoning to the answer: Because consumers can easily switch to other options, goods with many substitutes feature elastic demand, rendering the quantity demanded very sensitive to price changes. Common mistake: Assuming that a high availability of alternatives results in inelastic rather than elastic consumer responses.

Distractor check: A student might select all variables change or market equilibrium, misinterpreting the Latin phrase used for isolation of variables. Reasoning to the answer: The Latin phrase ceteris paribus translates to other things being equal, which assumes that all other factors remain constant when analyzing the effect of a single variable. Common mistake: Mistranslating ceteris paribus to mean that market conditions or all variables are shifting simultaneously.

Distractor check: A student might select 1.0 or 1.5 due to arithmetic errors when calculating percentage changes in price and quantity. Reasoning to the answer: The percentage change in quantity is minus twenty percent, calculated from a fall from one hundred to eighty units, while the percentage change in price is fifty percent, derived from a rise from ten to fifteen. Taking the absolute value of minus twenty divided by fifty yields an elasticity of zero point eight. Common mistake: Setting up the percentage change fractions incorrectly or dropping the negative sign incorrectly before taking the absolute value.

Distractor check: A student might choose monopolistic competition, confusing markets with differentiated products with those selling identical items. Reasoning to the answer: Perfect competition features many sellers offering identical products, where no single seller can influence the market price, as seen in agricultural markets. Common mistake: Confusing perfect competition with monopolistic competition where products are differentiated.

Distractor check: A student might pick reduce costs or provide employment, which are secondary business activities rather than the primary overarching objective. Reasoning to the answer: Firms operate in a capitalist system with the primary aim to maximize profit by optimizing revenue and minimizing costs. Common mistake: Confusing a firm's operational strategy, like cutting expenses, with its core ultimate goal.

Distractor check: A student might select vary with output, confusing fixed costs with variable costs that change during production. Reasoning to the answer: Fixed costs, such as rent, remain constant regardless of the output level, unlike variable costs that change directly with production volume. Common mistake: Failing to distinguish between overhead costs that stay the same and costs that fluctuate with output.

Distractor check: A student might pick all inputs are variable, which describes long-run production rather than the conditions triggering diminishing returns. Reasoning to the answer: The law applies when one input is fixed while others vary, meaning that adding more of a variable input to a fixed input eventually reduces marginal output, such as adding more workers to a fixed parcel of land. Common mistake: Forgetting that the law of diminishing returns specifically requires at least one factor of production to be held constant.

Distractor check: A student might choose average cost rises as output increases, describing diseconomies of scale instead. Reasoning to the answer: Economies of scale occur when increased production lowers average costs due to efficiencies, such as through bulk purchasing. Common mistake: Confusing economies of scale with diseconomies where expansion drives average costs upward.

Distractor check: A student might select the total cost curve or average cost curve, mixing up cost curves with supply behavior curves. Reasoning to the answer: In perfect competition, a firm supplies where price equals marginal cost, making its supply curve the portion of its marginal cost curve above the average variable cost. Common mistake: Identifying the entire marginal cost curve as the supply curve instead of restricting it to points above the average variable cost.

Distractor check: A student might select price equals average revenue, confusing a general revenue condition with the strict profit-maximization rule. Reasoning to the answer: A monopolist maximizes profit where marginal revenue equals marginal cost, and then sets the price above marginal cost because of its market power. Common mistake: Confusing the profit-maximizing output rule with pricing rules or average cost intersections.

Distractor check: A student might choose government regulation or worker education level, which are only secondary influences rather than the primary market driver. Reasoning to the answer: The price of labor, manifested as wages, is primarily determined by the supply of workers and the demand for labor in the market. Common mistake: Overemphasizing credentials or laws while ignoring the core forces of labor supply and demand.

Distractor check: A student might choose surplus, confusing the effects of price ceilings with price floors. Reasoning to the answer: A price ceiling set below equilibrium prevents prices from rising, which leads to a higher quantity demanded than supplied, thereby causing a shortage. Common mistake: Confusing the market shortage caused by a price ceiling with the surplus caused by a price floor.

Distractor check: A student might select 0.5 or 1.0 by improperly dividing price changes by supply changes instead of the reverse. Reasoning to the answer: The elasticity of supply is calculated as the percentage change in quantity supplied divided by the percentage change in price, which gives twenty divided by ten, resulting in two point zero. Common mistake: Inverting the numerator and denominator when calculating supply elasticity.