All practice questions

13931 questions

All types13,931 Multiple choice7,139 True / False771 Numeric1,526 Matching2,583 Ordering631 Fill in the blank1,223 Short answer58

Question 9421Question →

An adult insect species residing on tree trunks exhibits a mottled grey and brown cuticular pattern that makes it virtually indistinguishable from the lichen-covered bark. Conversely, a caterpillar species living in the same habitat displays bright yellow and black high-contrast stripes and releases foul-tasting secretions when attacked. Which of the following correctly classifies the primary defensive survival strategies employed by the adult insect and the caterpillar, respectively?

Cryptic coloration and Aposematic coloration

Batesian mimicry and Cryptic coloration

Aposematic coloration and Müllerian mimicry

Cryptic coloration and Protective mimicry

Show answer & explanation

Answer: Cryptic coloration and Aposematic coloration

Answer

Cryptic coloration for the adult insect and Aposematic coloration for the caterpillar

The adult insect matches the coloration and texture of its environmental substrate (tree bark), which is cryptic coloration. The caterpillar advertises its own unpalatability to predators using conspicuous yellow and black stripes, which is aposematic coloration.

Step-by-Step Solution

Analyze the physical appearance and adaptation of the adult insect

The mottled grey and brown coloration allows the insect to blend into the surrounding lichen-covered tree bark, which defines cryptic coloration (camouflage).

Cryptic coloration reduces detection risk by matching the physical background of the organism's habitat.

Analyze the physical appearance and defense of the caterpillar

The bright yellow and black pattern coupled with foul-tasting secretions serves to visually warn predators of noxious qualities, which defines aposematic coloration (warning coloration).

Aposematic coloration uses conspicuous visual signals to advertise unpalatability or toxicity to predators.

Pair the identified strategies in order

The respective strategies are Cryptic coloration for the adult insect and Aposematic coloration for the caterpillar.

This accurately distinguishes between blending into environmental surroundings and advertising chemical unpalatability.

Key Concept

Distinction between Cryptic Coloration (Camouflage) and Aposematic Coloration (Warning Coloration)

Question 9422Question →

Match each biological organism or indicator listed on the left with its corresponding ecological application or environmental pollution condition on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Fruticose lichens match with sensitivity to sulfur dioxide in clean air; Tubifex worms match with tolerance to low dissolved oxygen in organically polluted water; Mayfly nymphs match with unpolluted water requiring high dissolved oxygen; and Water hyacinth matches with phytoremediation of heavy metals and excess nutrients.

Fruticose lichens serve as bio-indicators of clean air because sulfur dioxide damages their chlorophyll and hinders growth. Tubifex worms indicate heavily polluted water enriched with organic matter where oxygen levels are minimal. Mayfly nymphs require pristine, oxygen-rich freshwater streams to survive. Water hyacinth is an aquatic plant species deployed in phytoremediation for absorbing excessive nutrients and heavy metal contaminants.

Step-by-Step Solution

Identify atmospheric pollution bio-indicators.

Fruticose lichens absorb rainwater directly and lack cuticles, making them vulnerable to sulfur dioxide (

SO_2

), which correlates them to clean air conditions.

Air quality bio-monitoring relies on lichen presence or absence.

Evaluate aquatic indicator organisms based on dissolved oxygen requirements.

Mayfly nymphs require pristine, oxygenated water, whereas Tubifex worms possess physiological adaptations to survive high organic loads and hypoxic sediments.

Benthic macroinvertebrates reflect the biological oxygen demand (BOD) and pollution severity of water bodies.

Identify biological pollution control mechanisms.

Water hyacinth acts as a hyperaccumulator species capable of removing excess nutrients and toxins through phytoremediation.

Plant-based bioremediation is an effective biological control method for nutrient enrichment and heavy metal removal.

Key Concept

Bio-indicators of Pollution and Biological Remediation

Question 9423Question →

Match each key institutional body or regulatory framework governing Nigeria's mining and petroleum sector with its primary statutory function or objective.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Petroleum Industry Act (PIA) 2021 matches with Comprehensive legal and fiscal overhaul transforming NNPC into a commercialized entity; Nigerian Upstream Petroleum Regulatory Commission (NUPRC) matches with Technical and commercial regulation of crude oil exploration; Nigerian Midstream and Downstream Petroleum Regulatory Authority (NMDPRA) matches with Regulation of refining, gas processing, pipeline transportation, and distribution; Solid Minerals Development Fund (SMDF) matches with Targeted public financing and investment mobilization to develop non-oil mineral exploration.

Each institution is correctly matched to its statutory role: the Petroleum Industry Act (PIA) 2021 reformed the legal and fiscal framework; NUPRC regulates upstream exploration and production; NMDPRA regulates midstream and downstream operations (refining, transport, and distribution); and the Solid Minerals Development Fund mobilizes capital for non-oil mineral exploration and infrastructure development.

Step-by-Step Solution

Identify the primary legal framework enacted in 2021 to reform Nigeria's oil industry governance.

The Petroleum Industry Act (PIA) 2021 provided a comprehensive legal and fiscal overhaul, commercializing NNPC into NNPC Limited.

Understanding key legislative reforms is essential for evaluating petroleum sector management.

Differentiate between the upstream and downstream/midstream regulatory agencies created by the PIA.

NUPRC handles exploration and extraction (upstream), while NMDPRA handles processing, refining, transportation, and retail distribution (midstream/downstream).

The regulatory division ensures specialized oversight of technical and commercial operations across the supply chain.

Identify the development institution dedicated to diversifying Nigeria's extractives through solid minerals.

The Solid Minerals Development Fund (SMDF) funds exploration and infrastructure development outside the oil sector.

Resource diversification policies rely on specialized funding bodies to expand non-oil mining contribution to GDP.

Key Concept

Regulatory institutions and policy frameworks managing Nigeria's petroleum and solid minerals sectors

Question 9424Question →

Human physiological traits, such as the ability to roll the tongue and the capacity to taste phenylthiocarbamide (PTC), exhibit distinct phenotypic classes with no intermediate forms, classifying them as examples of discontinuous variation.

True

False

Show answer & explanation

Answer: True

Answer

The statement is TRUE.

Tongue rolling and PTC tasting are classic examples of human physiological variations exhibiting discontinuous variation. They are controlled by major single genes and divide individuals into distinct, qualitative, non-overlapping groups (rollers vs. non-rollers, tasters vs. non-tasters) rather than showing a continuous range of phenotypes.

Step-by-Step Solution

Identify the nature of the traits mentioned in the stem.

Tongue rolling ability and PTC tasting are human physiological variations.

Physiological traits relate to the functional capabilities and metabolic responses of an individual.

Determine the distribution pattern of these specific physiological traits within human populations.

Individuals are either tongue rollers or non-rollers, and either PTC tasters or non-tasters, with no intermediate phenotype.

Single-gene inheritance produces discrete phenotypic classes unaffected by environmental factors.

Evaluate whether discrete phenotypic classification corresponds to discontinuous variation.

Traits divided into clear, non-overlapping categories represent discontinuous variation.

Discontinuous variation is characterized by distinct qualitative phenotypic categories controlled by one or a few genes.

Key Concept

Discontinuous variation in human physiological traits

Question 9425Question →

Match each institutional feature of a command (socialist) economic system on the left with its corresponding operational function or outcome on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Central Planning Authority pairs with setting output targets and input allocation; Administered Fixed Pricing pairs with setting prices below market-clearing levels leading to shortages; Public Ownership of Productive Assets pairs with directing capital toward social priorities rather than private profit; Turnover Tax and State Subsidies pairs with regulating disposable income and balancing state budget objectives.

Each feature of command socialism strictly aligns with state-directed economic operations: central planning boards determine quantitative output targets, rigid price fixing leads to persistent consumer goods shortages, state asset ownership eliminates profit-driven resource allocation, and turnover taxes serve as primary state revenue tools.

Step-by-Step Solution

Identify the primary planning body in a socialist economy.

Match the Central Planning Authority to formulation of production quotas and non-market input allocation.

State planning agencies replace the invisible hand of the market price mechanism.

Analyze how prices function under command socialism.

Match Administered Fixed Pricing to price setting below equilibrium causing persistent consumer shortages.

Prices are administratively set and rigid, failing to fluctuate to clear supply-demand imbalances.

Examine the role of public asset ownership.

Match Public Ownership of Productive Assets to resource direction focused on state goals rather than private profit.

Means of production belong to the state, eliminating individual profit motive as the allocation signal.

Determine the primary fiscal policy tools of the socialist state.

Match Turnover Tax and State Subsidies to state income regulation and budget management.

The state uses direct enterprise taxes and social subsidies to manage purchasing power and public revenue.

Key Concept

Operational Features and Mechanisms of Command Socialism

Question 9426Question →

Which of the following economic metrics is a composite indicator of economic development that integrates life expectancy, education, and per capita income?

Gross Domestic Product

Human Development Index

Per Capita Income

Gross National Product

Show answer & explanation

Answer: Human Development Index

Answer

Human Development Index

The Human Development Index is a composite indicator introduced by the United Nations Development Programme (UNDP) to measure economic development across three basic dimensions: a long and healthy life (life expectancy), knowledge (education), and a decent standard of living (GNI per capita).

Step-by-Step Solution

Identify the distinction between single quantitative growth indicators and composite qualitative development indicators.

Metrics like Gross Domestic Product, Gross National Product, and Per Capita Income reflect monetary output or average monetary income, whereas development encompasses broader quality-of-life improvements.

Economic development requires multidimensional evaluation beyond purely national accounting totals.

Evaluate the components of the Human Development Index (HDI).

HDI explicitly combines indicators of health (life expectancy at birth), knowledge/education (mean and expected years of schooling), and standard of living (GNI per capita).

HDI was designed specifically to provide a composite index measuring qualitative socioeconomic progress.

Key Concept

Human Development Index as a Composite Development Indicator

Question 9427Question →

A wheat farmer sells harvested wheat to a flour mill for ₦150,000. The flour mill processes the wheat into flour and sells it to a bakery for ₦220,000. The bakery uses the flour to produce bread, which is sold to final consumers for ₦300,000. Using the output (value added) method of national income accounting, what is the net contribution of this production chain to Gross Domestic Product (GDP)?

₦300,000

₦670,000

₦370,000

₦150,000

Show answer & explanation

Answer: ₦300,000

Answer

The net contribution of this production chain to GDP is ₦300,000.

The output (value added) method measures GDP by taking the gross value of output at each stage of production and subtracting the cost of intermediate consumption. The farmer adds ₦150,000, the mill adds ₦70,000 (₦220,000 - ₦150,000), and the bakery adds ₦80,000 (₦300,000 - ₦220,000). Summing these gives ₦300,000, which is equal to the value of the final consumer product.

Step-by-Step Solution

Calculate the value added by the wheat farmer

Value Added = ₦150,000 - ₦0 = ₦150,000

The raw wheat is sold for ₦150,000 with zero intermediate input costs recorded.

Calculate the value added by the flour mill

Value Added = ₦220,000 - ₦150,000 = ₦70,000

The mill buys wheat for ₦150,000 and sells flour for ₦220,000.

Calculate the value added by the bakery

Value Added = ₦300,000 - ₦220,000 = ₦80,000

The bakery buys flour for ₦220,000 and sells bread to consumers for ₦300,000.

Sum the value added across all stages to find total GDP contribution

Total Value Added = ₦150,000 + ₦70,000 + ₦80,000 = ₦300,000

The output method sums the net additions to output at each production stage to avoid double counting.

Key Concept

Value Added Method of National Income Accounting

Question 9428Question →

In human ABO blood group inheritance, although three main alleles ( $I^A$ , $I^B$ , and $i$ ) exist within the human population, any normal diploid individual can possess at most two of these alleles.

True

False

Show answer & explanation

Answer: True

Answer

The statement is true.

The statement is true because multiple allelism is a population-level concept describing three or more allele variants in a gene pool, whereas every diploid individual is constrained to carrying exactly two alleles for any autosomal gene locus.

Step-by-Step Solution

Define multiple allelism in population genetics.

The ABO blood group system exhibits multiple alleles (

I^A

I^B

, and

i

) across the population.

Multiple alleles refer to three or more alternative forms of a gene occupying the same locus on homologous chromosomes across a species.

Analyze individual chromosomal makeup (ploidy).

Humans are diploid organisms with homologous chromosome pairs.

An individual inherits one set of 23 chromosomes from the egg cell and one set from the sperm cell.

Determine the maximum number of alleles per individual.

An individual can carry a maximum of two alleles at the ABO gene locus (e.g.,

I^A I^A

I^A I^B

I^A i

I^B I^B

I^B i

, or

ii

Since a gene locus exists only twice in a diploid cell (once per homologous chromosome), an individual can never possess three alleles.

Key Concept

Multiple Alleles vs Diploid Genotype

Estimated Time:1m 0s

Question 9429Question →

A commercial bank in Nigeria hesitates to extend loans to smallholder farmers due to high default risks and lack of acceptable collateral. Which government initiative was specifically established to encourage bank lending by guaranteeing a substantial percentage of agricultural loans against default?

Agricultural Credit Guarantee Scheme Fund (ACGSF)

Import Substitution Industrialization (ISI) Program

Privatization and Commercialization Policy

National Development Rolling Plan System

Show answer & explanation

Answer: Agricultural Credit Guarantee Scheme Fund (ACGSF)

Answer

Agricultural Credit Guarantee Scheme Fund (ACGSF)

The Agricultural Credit Guarantee Scheme Fund (ACGSF) was jointly established by the Federal Government of Nigeria and the Central Bank of Nigeria to pledge financial guarantee support (up to 75% of principal and interest in default) to commercial banks, mitigating the risk of lending to smallholder agricultural producers.

Step-by-Step Solution

Identify the primary economic bottleneck described in the stem.

The bottleneck is commercial banks' reluctance to grant loans to agricultural smallholders due to high default risks.

Agricultural production in Nigeria faces natural hazards, crop failures, and low collateral capacity, making banks risk-averse.

Evaluate the matching government intervention policy.

The Agricultural Credit Guarantee Scheme Fund (ACGSF), established in 1977, guarantees up to 75% of the net amount in default to lending banks.

By absorbing part of the risk, the policy directly addresses credit access challenges for farmers.

Key Concept

Agricultural Credit and Policy Interventions in Nigeria

Estimated Time:1m 0s

Question 9430Question →

The table below illustrates the utility schedule of a consumer consuming consecutive units of chocolate bars:

Quantity Consumed ( $Q$ )	Total Utility ( $TU$ ) in Utils	Marginal Utility ( $MU$ ) in Utils
$1$	$15$	$15$
$2$	$27$	$12$
$3$	$36$	$9$
$4$	$42$	$M$
$5$	$45$	$3$

Based on the table, what is the Average Utility ( $AU$ ) of the consumer at $4$ units of consumption?

10.50

utils

6.00

utils

14.00

utils

8.40

utils

Show answer & explanation

Answer: $10.50$ utils

Answer

The Average Utility (

AU

) of the consumer at

4

units of consumption is

10.50

utils.

Average Utility (

AU

) measures satisfaction per unit of commodity consumed and is defined mathematically as

AU = \frac{TU}{Q}

. At

4

units of consumption, the Total Utility (

TU

) is

42

utils. Dividing

42

utils by

4

units yields an Average Utility of

10.50

utils.

Step-by-Step Solution

Identify Total Utility (

TU

) at the 4th unit of consumption from the schedule.

TU_4 = 42

utils.

Average Utility requires total satisfaction divided by the total number of units consumed.

Apply the Average Utility formula:

AU_n = \frac{TU_n}{n}

AU_4 = \frac{42}{4} = 10.50

utils.

Average utility measures the utility per unit of consumption.

Key Concept

Calculation of Average Utility from a Total Utility Schedule

Estimated Time:1m 0s

Question 9431Question →

An economy operates along a linear-segmented Production Possibility Curve with full employment of resources, producing only Solar Panels ( $S$ ) and Wind Turbines ( $T$ ). Its production schedule is given in the table below:

Combination	Solar Panels ( $S$ )	Wind Turbines ( $T$ )
P	100	0
Q	85	10
R	65	20
S	40	30
U	0	40

If the society decides to reallocate its scarce resources to increase the output of Wind Turbines from $10$ units to $30$ units, what is the average opportunity cost per unit of Wind Turbine gained, expressed in terms of Solar Panels foregone?

Show answer & explanation

Answer: 2.25

Answer

2.25

Moving from Combination Q to Combination S increases Wind Turbine production from

10

30

units (a gain of

20

units). Simultaneously, Solar Panel production falls from

85

40

units (a loss of

45

units). The opportunity cost per unit of Wind Turbine gained is the total number of Solar Panels foregone divided by the total Wind Turbines gained:

45 \div 20 = 2.25

Step-by-Step Solution

Determine initial output of Solar Panels at

10

units of Wind Turbines

10

Wind Turbines (Combination Q), Solar Panel production is

85

units.

Establishing the baseline production combination before reallocation.

Determine new output of Solar Panels at

30

units of Wind Turbines

30

Wind Turbines (Combination S), Solar Panel production is

40

units.

Establishing the ending production combination after reallocation.

Calculate total sacrificed Solar Panels and total gained Wind Turbines

Solar Panels foregone =

85 - 40 = 45

units. Wind Turbines gained =

30 - 10 = 20

units.

Opportunity cost measures the sacrifice of alternative output necessary to obtain additional units of the target output.

Calculate marginal/average opportunity cost per unit gained

Average Opportunity Cost =

\frac{45 \text{ Solar Panels}}{20 \text{ Wind Turbines}} = 2.25

Solar Panels per Wind Turbine.

Dividing total units foregone by total units gained provides the unit opportunity cost.

Key Concept

Marginal Opportunity Cost along a Production Possibility Curve

Question 9432Question →

A nation operating under a socialist command economy experiences an increased public demand for consumer footwear. How are additional productive resources reallocated to expand footwear manufacturing in this economy?

Direct administrative directives and target adjustments issued by the central planning authority

Automatic increases in market prices that signal private investors to shift capital into footwear production

Independent profit-maximizing decisions made by autonomous factory managers

Competitive bidding among consumers that drives up raw material prices and wage rates

Show answer & explanation

Answer: Direct administrative directives and target adjustments issued by the central planning authority

Answer

Direct administrative directives and target adjustments issued by the central planning authority

In a socialist command economy, the central planning authority controls state-owned factors of production. Any adjustment to output levels or reallocation of raw materials, labor, and capital must be executed through official central planning directives and state quota adjustments.

Step-by-Step Solution

Identify the key characteristics of a command (socialist) economic system.

In a command economy, the state owns factors of production and centralized planning bodies dictate resource allocation, output targets, and distribution.

Understanding the institutional framework determines how economic decisions are made.

Analyze how shifts in consumer demand impact production within this system.

Because market price mechanisms and profit motives are absent or restricted, production changes require administrative reassessment and official production quota adjustments by central planners.

Resource reallocation depends on central plan revision rather than price signals.

Key Concept

Resource Allocation in a Command Economy

Estimated Time:1m 0s

Question 9433Question →

During meiotic cell division, the failure of homologous chromosomes or sister chromatids to separate properly results in gametes with abnormal numbers of chromosomes. What is the precise biological term for this failure of separation?

Nondisjunction

Translocation

Crossing over

Polyploidy

Show answer & explanation

Answer: Nondisjunction

Answer

Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly during meiotic cell division.

Nondisjunction specifically describes the failure of homologous chromosomes to separate during Anaphase I or sister chromatids to separate during Anaphase II of meiosis, resulting in daughter cells with missing or extra chromosomes.

Step-by-Step Solution

Identify the chromosomal process described in the stem.

The stem describes an error during meiosis where chromosomes or chromatids fail to separate during Anaphase I or Anaphase II.

Accurate biological terminology distinguishes structural chromosome changes from numerical errors caused by separation failures.

Differentiate between structural chromosomal aberrations, normal meiotic events, and nuclear division errors.

Translocation is a structural rearrangement, crossing over is normal genetic recombination, and polyploidy involves whole-genome duplication.

Failure of specific chromosome pairs or chromatids to separate during division is termed nondisjunction, which directly causes aneuploidy.

Key Concept

Nondisjunction and Aneuploidy

Estimated Time:1m 0s

Question 9434Question →

A firm operating in a perfectly competitive market sells its product at a constant price of $P = \$30$ . The firm's short-run marginal cost function is given by $MC = 2Q + 10$ , where $Q$ is the quantity produced. Assuming the firm maximizes profit, what is the total revenue earned by the firm at equilibrium?

\$300

\$150

\$200

\$600

Show answer & explanation

Answer: $\$300$

Answer

\$300

In perfect competition, the firm is a price taker, so price equals marginal revenue (

P = MR = \$30

). Setting

MR = MC

gives

30 = 2Q + 10

, which solves to

Q = 10

units. Multiplying output by the price yields total revenue of

\$300

Step-by-Step Solution

Determine Marginal Revenue (MR)

MR = P = \$30

In a perfectly competitive market, price is constant and equal to marginal revenue.

Set profit-maximization condition MR = MC to solve for equilibrium quantity (Q)

30 = 2Q + 10 \Rightarrow 2Q = 20 \Rightarrow Q = 10

units

Profit is maximized where marginal revenue equals marginal cost.

Calculate Total Revenue (TR)

TR = P \times Q = \$30 \times 10 = \$300

Total revenue is the product of market price and equilibrium output.

Key Concept

Short-run Profit Maximization under Perfect Competition

Question 9435Question →

A large-scale garment factory in Aba reorganized its production line into specific tasks such as cutting, stitching, buttoning, and ironing. Following this restructuring, total output per worker increased significantly, but the firm soon noticed a decline in worker morale and flexibility when replacing absent staff. Which of the following factors best explains the primary operational limitation experienced by the enterprise as a direct consequence of intense division of labor?

Increased occupational immobility and monotony among workers

The rapid onset of the law of diminishing returns due to excess variable inputs

A shift in production focus from export promotion to domestic market substitution

An rise in unit production cost caused by confusing fixed inputs with variable operational expenses

Show answer & explanation

Answer: Increased occupational immobility and monotony among workers

Answer

Increased occupational immobility and monotony among workers

The correct answer identifies that intense specialization forces workers into narrow, repetitive tasks, causing psychological boredom (monotony) and preventing them from acquiring multi-functional skills (occupational immobility). Consequently, the enterprise struggles when substituting workers across different production stages.

Step-by-Step Solution

Analyze the firm's operational context

The factory divided production into specialized sub-tasks (cutting, stitching, buttoning, ironing).

This establishes a classic division of labor framework.

Identify the reported negative operational symptoms

Declining worker morale (boredom/monotony) and difficulty reassigning staff to cover absences (occupational immobility).

Specialization narrows a worker's skill set to a single repetitive operation.

Evaluate the economic limitation corresponding to these symptoms

Over-specialization creates monotony (reducing morale) and restricts multi-skilling (causing internal occupational immobility).

Workers perform isolated routine operations continuously without learning alternative production stages.

Key Concept

Disadvantages and Limitations of Division of Labor

Estimated Time:2m 0s

Question 9436Question →

A poultry farmer in Ogun State raises birds primarily for meat production. In the process, poultry manure and feathers are automatically produced alongside chicken meat. Which type of supply is illustrated by this production process?

Joint supply

Competitive supply

Composite supply

Derived supply

Show answer & explanation

Answer: Joint supply

Answer

Joint supply

Joint supply occurs when two or more goods are produced together from a single main source or activity. In this scenario, producing chicken meat naturally yields feathers and manure as co-products.

Step-by-Step Solution

Analyze the production relationship in the scenario

Chicken meat, poultry manure, and feathers are all generated simultaneously from the single process of raising poultry.

Identifying whether the products are produced together or in competition determines the type of supply.

Classify the type of supply based on economic definitions

Products that are inherently produced together from the same origin represent joint (or complementary) supply.

An increase in poultry farming for meat automatically increases the output of manure and feathers.

Key Concept

Joint (Complementary) Supply

Estimated Time:45s

Question 9437Question →

Which of the following statements best expresses the fundamental law of supply in economics?

Producers offer a larger quantity of a commodity for sale at higher prices than at lower prices, ceteris paribus.

Producers supply a smaller quantity of a commodity as its market price increases.

An increase in price causes an outward shift of the entire supply curve to the right.

Quantity supplied changes independently of price signals due to centralized administrative directives.

Show answer & explanation

Answer: Producers offer a larger quantity of a commodity for sale at higher prices than at lower prices, ceteris paribus.

Answer

Producers offer a larger quantity of a commodity for sale at higher prices than at lower prices, ceteris paribus.

The law of supply states that, holding all other factors constant (ceteris paribus), an increase in price leads to an increase in quantity supplied, showing a direct relationship between price and quantity supplied.

Step-by-Step Solution

Identify the basic relationship defined by the law of supply.

The law of supply establishes that price and quantity supplied are directly (positively) related.

Higher prices increase profit margins, incentivizing suppliers to increase output.

Differentiate price effects from shift factors.

A change in the good's own price causes a movement along the supply curve (change in quantity supplied), rather than a shift of the supply curve.

Non-price determinants (such as technology and input prices) cause supply curve shifts.

Key Concept

Law of Supply

Question 9438Question →

A consumer allocates a fixed monetary budget exclusively between Good $X$ (plotted on the horizontal axis) and Good $Y$ (plotted on the vertical axis). If the market price of Good $X$ decreases while the consumer's income and the price of Good $Y$ remain unchanged, which of the following describes the resulting structural change to the budget line?

The budget line pivots outward along the horizontal axis, becoming flatter.

The budget line shifts parallel to the right away from the origin.

The budget line pivots inward along the vertical axis, becoming steeper.

The slope of the budget line increases because Good

X

is now more expensive relative to Good

Y

Show answer & explanation

Answer: The budget line pivots outward along the horizontal axis, becoming flatter.

Answer

The budget line pivots outward along the horizontal axis, becoming flatter.

The horizontal intercept of a budget line is given by

I/P_X

and the vertical intercept by

I/P_Y

. When the price of Good

X

drops while income and the price of Good

Y

remain constant, the maximum quantity of Good

X

affordable increases, pushing the horizontal intercept outward. Since the vertical intercept does not move, the budget line pivots around the vertical intercept and its absolute slope (

P_X/P_Y

) decreases, making the line flatter.

Step-by-Step Solution

Identify the equation and intercepts of the budget line

The budget equation is

P_X X + P_Y Y = I

. The horizontal intercept is

I/P_X

, the vertical intercept is

I/P_Y

, and the absolute slope is

P_X/P_Y

Intercepts define the maximum quantities affordable of each good when spending all income on that single good.

Analyze the impact of a decrease in

P_X

P_X

decreases to

P_X'

, the horizontal intercept

I/P_X'

increases (moves further right). The vertical intercept

I/P_Y

remains unchanged.

Income

I

and

P_Y

are constant, so the consumer can purchase more units of Good

X

but the maximum amount of Good

Y

remains fixed.

Determine the change in slope

The magnitude of the slope decreases from

P_X/P_Y

P_X'/P_Y

, meaning the budget line becomes flatter.

The slope measures the opportunity cost of Good

X

. A cheaper Good

X

requires giving up fewer units of Good

Y

per unit of Good

X

acquired.

Key Concept

Budget Line Rotation and Relative Price Changes

Question 9439Question →

When estimating a country's national income using the income method, which of the following receipts must be excluded because it does not represent payment for factor services rendered?

Unemployment benefits paid by the government

Wages and salaries earned by factory employees

Net rental income received by property owners

Corporate profits retained by public companies

Show answer & explanation

Answer: Unemployment benefits paid by the government

Answer

Unemployment benefits paid by the government must be excluded when estimating national income using the income method.

Under the income method of national income accounting, only factor incomes earned through contribution to current economic production (wages, rent, interest, and profit) are included. Unemployment benefits are transfer payments made by government to individuals without any corresponding exchange of goods or factor services. Thus, they must be excluded to prevent overstating national income.

Step-by-Step Solution

Identify the basic principle of the income method of national income measurement.

The income method sums all earned factor rewards (wages, rent, interest, and profits) paid to factors of production for contributing to current productive activity.

National income measures only the value of economic production generated within a given period.

Evaluate each transaction to distinguish between factor incomes and transfer payments.

Wages, rent, and profits are payments for factor services rendered. Transfer payments, such as unemployment benefits, pensions, or student grants, are gifts or relief payments involving no current exchange of goods or services.

Including transfer payments would result in double counting income that was already earned and taxed elsewhere.

Select the item that must be excluded.

Unemployment benefits paid by the government must be excluded.

It represents a unearned transfer of income rather than factor earnings from current production.

Key Concept

Exclusion of Transfer Payments in the Income Method of National Income Accounting

Question 9440Question →

Suppose two indifference curves, $IC_1$ and $IC_2$ , intersect at point $A$ on a consumer's indifference map. Which fundamental assumption of ordinal utility theory is logically violated by this intersection?

Transitivity and consistency of consumer preferences

Diminishing marginal rate of substitution between goods

Maximization of total utility when marginal utility reaches zero

Constant marginal rate of substitution across all utility levels

Show answer & explanation

Answer: Transitivity and consistency of consumer preferences

Answer

Transitivity and consistency of consumer preferences

The correct answer is transitivity and consistency of consumer preferences. Indifference curves cannot intersect because if they did, a shared point of intersection would imply that two different levels of utility are equal, contradicting the axiom of transitivity (

If\ A \sim B\ and\ A \sim C,\ then\ B \sim C

Step-by-Step Solution

Analyze the definition of an indifference curve

Every point on a single indifference curve yields the exact same level of total utility to the consumer.

An indifference curve represents loci of commodity combinations that offer equal satisfaction.

Apply logical deductions to intersecting curves

If point

A

lies on both

IC_1

and

IC_2

, then utility at

A

equals utility at point

B

(on

IC_1

) and utility at point

C

(on

IC_2

Points on the same curve must yield equal utility.

Evaluate the outcome against preference transitivity

By transitivity, if

B = A

and

A = C

, then

B

must equal

C

. However, since

B

and

C

lie on different curves representing different utility levels, this creates a logical contradiction.

Transitivity requires consistent preference ordering (

If\ X \sim Y\ and\ Y \sim Z,\ then\ X \sim Z

). Therefore, indifference curves can never intersect.

Key Concept

Indifference Curve Properties: Non-intersection and Preference Transitivity

Estimated Time:1m 0s

PreviousPage 472 / 697Next

All practice questions

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept