JAMB Economics 2015
Questions & Answers

A student might mistakenly associate high dependency with a low cost of living or high standard of living due to family support misconceptions. A high dependency ratio means a small workforce must support a vast population of dependents, which drains personal savings, suppresses capital formation, and traps the economy in a vicious cycle of poverty. Common mistake: Assuming supporting many dependents stimulates economic growth rather than depleting savings and investment.

One might select small size of farms or pest attacks, which are certainly issues but secondary to structural limitations. Inadequate modern farm implements, such as tractors and harvesters, severely restrict agricultural productivity and efficiency in Nigeria, preventing transition away from manual labor. Common mistake: Confusing common localized crop issues with overarching technological bottlenecks in farming.

Students could mistakenly assume cooperative societies require divergent interests or unlimited membership sizes. A defining organizational feature of cooperative societies is free entry and exit, meaning members can join or leave voluntarily without restrictive barriers. Common mistake: Confusing the voluntary nature of cooperatives with mandatory corporate shareholding structures.

One might confuse the marginal propensity to save with the average propensity to consume or changes in market supply. The marginal propensity to save measures the ratio of change in savings relative to a change in the level of income, expressed mathematically as MPS = ΔS/ΔY. Common mistake: Mixing up marginal ratios with total averages or confusing savings changes with consumption changes.

A student might pick seasonal variation or business cycle changes, which describe seasonal or cyclical unemployment rather than structural shifts. Structural unemployment arises when there is a change in the consumption pattern or technological advancements that render specific skill sets obsolete, such as automation replacing human manual labor. Common mistake: Confusing short-term cyclical downturns with long-term structural changes in technology and consumer demand.

A student might choose the high cost of conducting census or inadequate skilled personnel as the primary systemic flaw. Distortion of census figures, often driven by political manipulation or inaccurate regional reporting, remains a major problem undermining the reliability of population data in Nigeria. Common mistake: Overlooking deliberate data falsification in favor of logistical challenges during a census.

Students might mistakenly select options like rise or remain constant if they confuse how fiscal policy shifts macro variables. When overall government spending contracts, the total demand for goods and services in the marketplace shrinks. This downward shift in aggregate demand naturally exerts downward pressure on prices, causing them to fall. Common mistake: Assuming government budget cuts will directly increase commodity prices.

Learners often mistakenly guess that total product is at its maximum or that marginal product equals zero, confusing the peak of production with the point of peak efficiency. Additional inputs contribute their highest efficiency to overall output right before the onset of diminishing returns. Mathematically and conceptually, this peak efficiency happens precisely at the intersection where the average product equals the marginal product. Common mistake: Confusing the maximum point of total output with the point of highest marginal efficiency.

A student might mistakenly choose diminishing marginal utility because that term describes the general trend of satisfaction, rather than the aggregate value. To find the cumulative value of consumption, you must aggregate the individual satisfaction metrics gained from each successive item consumed. Therefore, the aggregate satisfaction derived from consuming each additional unit of a good or service is defined as total utility. Common mistake: Confusing the law of diminishing utility with the cumulative aggregation of utility.

One might incorrectly select the public and private sectors if they confuse capitalist systems with mixed economic models. Under a pure capitalist framework, private individuals and commercial firms hold total ownership and control over productive assets like land, capital, and labor. Common mistake: Assuming all modern economies operate under mixed sector ownership.

A student might mistakenly choose economic rent or profit, thinking of general factor rewards rather than non-productive payments. Unlike wages or business profits which directly reward productive output, transfer payments such as pensions and unemployment benefits are delivered without any linked productive output. Common mistake: Failing to distinguish between productivity-based factor earnings and social welfare transfers.

An examinee might select the option where quantity supplied exceeds quantity demanded, which actually describes a market surplus rather than a shortage. Shortages and excess demand arise specifically when buyers want to purchase more than sellers are offering, which happens when prices sit below the market equilibrium level. Common mistake: Confusing market surplus with market shortage.

A student could mistakenly choose the need for money to invest, confusing speculative holding with capital formation. Rather than putting funds into long-term investments, the underlying preference is to maintain cash liquidity for transactional, precautionary, or speculative needs. Common mistake: Equating the general demand for liquidity with physical investment capital.

A student might mistakenly pick an option involving marginal revenue or incorrect curve positions by guessing randomly among graphical terms. To achieve producer equilibrium, a firm must minimize its operational costs for a specific output target, which graphically occurs precisely where the isoquant curve representing output level is tangent to the isocost constraint line. Common mistake: Confusing consumer indifference curves with producer isoquant-isocost tangencies.

One might mistakenly select the total value of invisible import and export, confusing physical goods with services. The balance of trade focuses strictly on tangible commodities, measuring the financial difference between the total value of visible imports and exports. Common mistake: Confusing visible trade balances with invisible trade balances.

A student might miscalculate by directly multiplying the deposit by the reserve ratio or using an inverted formula. First, determine the credit multiplier by taking the reciprocal of the cash reserve ratio, which gives 1 divided by 0.3, resulting in approximately 3.33. Multiplying this multiplier by the initial ₦20 million deposit yields a total money supply increase of approximately ₦66.7 million. Common mistake: Forgetting to compute the credit multiplier before applying it to the initial deposit.

A student might mistakenly think that a price drop always increases quantity demanded according to the standard law of demand. However, luxury ostentatious goods derive their appeal from high price tags and exclusivity; when their price falls, their status symbol weakens, leading to a decrease in quantity demanded due to the Veblen effect. Common mistake: Applying normal demand rules to Veblen goods.

One might mistakenly select balance debt or debt relief, confusing general loan statuses with ongoing payment actions. The routine process of covering interest fees and repaying the principal on active loans over a designated timeframe is formally known as debt servicing. Common mistake: Confusing the total accumulated debt balance with the ongoing process of debt servicing.

A student might mistakenly choose the mean or range, assuming mathematical complexity equals difficulty. In grouped data sets, finding the mode is uniquely difficult because grouped class intervals obscure the exact frequencies of individual data points, unlike straightforward calculations for the mean or range. Common mistake: Assuming measures of dispersion are always harder to calculate than measures of central tendency.

An examinee might mistakenly choose population growth or division of labour, overlooking physical operational constraints. Businesses naturally choose to cluster their operations close to essential raw material deposits in order to minimize heavy transportation costs, making this the primary determinant of industrial location. Common mistake: Overlooking transport cost minimization as the primary driver of industrial localization.