All practice questions

A nation's international economic transactions for a given fiscal year are recorded as follows:

• Merchandise exports: $450 million • Merchandise imports:$ 520 million
• Freight and shipping receipts: $60 million • Investment income earned from abroad:$ 35 million

Based on the balance of payments structure, what is the country's balance of trade?

A deficit of $70 million

A deficit of $130 million

A deficit of $35 million

A surplus of $70 million

Show answer & explanation

Answer: A deficit of $70 million

Answer

A deficit of $70 million

The balance of trade (or balance of visible trade) is calculated strictly as Merchandise Exports minus Merchandise Imports (

450M -

520M = -

70M). Since imports exceed exports, the result is a deficit of

70 million. Services such as shipping receipts and primary income like investment earnings are excluded because they form part of invisible trade within the broader current account.

Step-by-Step Solution

1

Identify the components of the Balance of Trade (Visible Balance)

Balance of Trade includes only tangible merchandise exports (

450 million) and merchandise imports (

520 million). Invisible items like shipping receipts and investment income belong elsewhere in the current account.

By definition, the balance of trade measures the net value of visible goods exported and imported.

2

Apply the Balance of Trade formula

Balance of Trade = Visible Exports - Visible Imports =

450 million -

520 million = -$70 million

Subtracting imports from exports yields a negative value, which represents a trade deficit.

Key Concept

Balance of Trade vs. Current Account Structure

Estimated Time:1m 0s

Question 9442Question →

The national income statistics for the Republic of Eldoria in a given fiscal year record the following expenditure components (in millions of dollars):

- Household Consumption Expenditure ( $C$ ): $\$420$
- Gross Private Domestic Investment ( $I$ ): $\$150$
- Government Final Expenditure ( $G$ ): $\$180$
- Export Revenues ( $X$ ): $\$85$
- Import Expenditures ( $M$ ): $\$95$
- Net Factor Income Paid to Abroad: $\$15$

What is Eldoria's Gross National Product ( $GNP$ ) at market prices?

\$725

million

\$740

million

\$755

million

\$915

million

Show answer & explanation

Answer: $\$725$ million

Answer

The Gross National Product (GNP) at market prices is

\$725

million.

The expenditure approach defines

GDP = C + I + G + (X - M)

. Substituting the given figures gives

GDP = 420 + 150 + 180 + (85 - 95) = 740

million dollars. To find

GNP

, net factor income from abroad is added. Since net factor income was paid to abroad (an outflow of 15 million dollars),

NFIA = -15

million dollars. Therefore,

GNP = 740 - 15 = 725

million dollars.

Step-by-Step Solution

1

Calculate Gross Domestic Product (GDP) using the expenditure formula:

GDP = C + I + G + (X - M)

GDP = 420 + 150 + 180 + (85 - 95) = 750 + (-10) = \$740

million

The expenditure approach sums consumption, investment, government spending, and net exports (exports minus imports).

2

Determine Net Factor Income from Abroad (NFIA)

Since net factor income is paid to abroad (outflow),

NFIA = -\$15

million

Factor income flowing out of the domestic economy reduces the national income earned by citizens.

3

Convert GDP to GNP using the relation:

GNP = GDP + NFIA

GNP = 740 + (-15) = \$725

million

Gross National Product measures total output created by residents of a country, regardless of location.

Key Concept

Expenditure Method of National Income Accounting

Question 9443Question →

A commercial bank receives a fresh cash deposit of $₦120,000$ . If the central bank mandates a legal cash reserve ratio of $15\%$ and commercial banks voluntarily hold an additional excess cash reserve ratio of $5\%$ , what is the total amount of net credit created by the banking system?

₦480,000

₦600,000

₦680,000

₦24,000

Show answer & explanation

Answer: $₦480,000$

Answer

The total amount of net credit created by the banking system is

₦480,000

.

The total reserve ratio is the sum of legal reserves (

15\%

) and voluntary excess reserves (

5\%

), giving

20\%

(

0.20

). The credit multiplier is

\frac{1}{0.20} = 5

. Total deposit expansion equals

₦120,000 \times 5 = ₦600,000

. Subtracting the initial deposit of

₦120,000

yields a net credit creation of

₦480,000

.

Step-by-Step Solution

1

Calculate the effective total cash reserve ratio

Effective Reserve Ratio =

15\% + 5\% = 20\% = 0.20

Both legal required reserves and voluntary excess reserves leak from loanable funds, so they must be combined.

2

Calculate the credit expansion multiplier

Credit Multiplier (

K

) =

\frac{1}{\text{Total Reserve Ratio}} = \frac{1}{0.20} = 5

The deposit expansion multiplier is the reciprocal of the total reserve ratio.

3

Determine total deposit expansion created by the banking system

Total Deposit Expansion = Initial Primary Deposit

\times K = ₦120,000 \times 5 = ₦600,000

The banking system expands total secondary deposits up to five times the primary deposit.

4

Calculate net credit created

Net Credit Created = Total Deposit Expansion - Initial Primary Deposit = ₦600,000 - ₦120,000 = ₦480,000

Net credit creation measures only the new money created through lending, excluding the initial primary cash injection.

Key Concept

Net Credit Creation with Excess Cash Reserves

Estimated Time:2m 0s

Question 9444Question →

A developing country targets an annual economic growth rate of $8\%$ . The economy's Incremental Capital-Output Ratio (ICOR) is estimated at $3.5$ , and its current domestic savings rate is $21\%$ of national income. According to the Harrod-Domar growth model, what is the foreign savings gap (as a percentage of national income) that must be filled to achieve this growth target?

7.0\%

28.0\%

2.29\%

4.5\%

Show answer & explanation

Answer: $7.0\%$

Answer

7.0\%

of national income

According to the Harrod-Domar development planning model, the rate of economic growth (

g

) equals the savings ratio (

s

) divided by the Incremental Capital-Output Ratio (

k

), expressed as

g = \frac{s}{k}

. Rearranging this gives the total required savings rate

s^* = g \times k = 8\% \times 3.5 = 28\%

. Given that domestic savings currently provide

21\%

of national income, the remaining savings gap to be financed via external capital or foreign aid is

28\% - 21\% = 7.0\%

.

Step-by-Step Solution

1

Identify the basic Harrod-Domar growth equation relating growth rate (

g

), savings rate (

s

), and Incremental Capital-Output Ratio (

k

).

Formula:

g = \frac{s}{k}

The Harrod-Domar model establishes that economic growth depends directly on the savings rate and inversely on the capital-output ratio.

2

Rearrange the equation to determine the total required domestic savings rate (

s^*

) needed to achieve the target growth rate (

g = 8\%

or

0.08

) with an ICOR (

k = 3.5

).

s^* = g \times k = 8\% \times 3.5 = 28\%

To achieve an

8\%

growth rate with an ICOR of

3.5

, the country must allocate

28\%

of its national income to capital investment.

3

Calculate the savings gap by subtracting the current domestic savings rate (

s = 21\%

) from the total required savings rate (

s^* = 28\%

).

Savings Gap

= s^* - s = 28\% - 21\% = 7.0\%

The difference between required investment resources and available domestic savings defines the external financing requirement.

Key Concept

Harrod-Domar Growth Model and Savings Gap Analysis

Question 9445Question →

A developing economy recorded the following national income statistics for a given fiscal year:

Economic Component	Amount ($ millions)
Compensation of employees	$520$
Net operating surplus	$280$
Mixed income of the self-employed	$150$
Social security transfer payments	$60$
Consumption of fixed capital (Depreciation)	$40$
Net Factor Income from Abroad (NFIA)	$-25$

Based on the income method of measurement, what is the country's Gross National Product at factor cost ( $GNP_{FC}$ )?

$925 million

$965 million

$1,015 million

$1,025 million

Show answer & explanation

Answer: $965 million

Answer

$965 million

Under the income method, total factor earnings comprise compensation of employees (

520 million), net operating surplus (

280 million), and mixed income of the self-employed (

150 million), giving Net Domestic Product at factor cost (

NDP_{FC}

) of

950 million. Adding depreciation (

40 million) converts this to

GDP_{FC}

(

990 million). Finally, adjusting for Net Factor Income from Abroad (

-25 million) yields

GNP_{FC} = 990 + (-25) = \

965 million

. Social security transfer payments ($60 million) are omitted as non-factor receipts.

Step-by-Step Solution

1

Exclude non-factor receipts and sum factor incomes to calculate Net Domestic Product at factor cost (

NDP_{FC}

).

NDP_{FC} = 520 + 280 + 150 = 950\text{ million}

. Transfer payments ($60 million) are excluded.

Transfer payments are unilateral payments received without providing productive factors/goods in return.

2

Add consumption of fixed capital (depreciation) to convert

NDP_{FC}

to Gross Domestic Product at factor cost (

GDP_{FC}

).

GDP_{FC} = 950 + 40 = 990\text{ million}

.

Gross aggregates include capital consumption allowance (depreciation), whereas net aggregates exclude it.

3

Add Net Factor Income from Abroad (NFIA) to

GDP_{FC}

to arrive at Gross National Product at factor cost (

GNP_{FC}

).

GNP_{FC} = 990 + (-25) = 965\text{ million}

.

GNP measures total income earned by residents regardless of location (

GNP = GDP + NFIA

).

Key Concept

Calculation of Gross National Product at factor cost (

GNP_{FC}

) using the Income Method

Estimated Time:2m 0s

Question 9446Question →

In a competitive market, an increase in the market price of locally manufactured footwear leads producers to allocate more resources to expand output. Assuming all other factors remain constant, which of the following correctly describes this producer response?

An expansion of quantity supplied, represented by a movement upward along the existing supply curve

An increase in overall supply, represented by a rightward shift of the supply curve

A contraction of quantity supplied, represented by a movement downward along the supply curve

A reallocation of production quotas established by central economic authorities

Show answer & explanation

Answer: An expansion of quantity supplied, represented by a movement upward along the existing supply curve

Answer

The economic response is an expansion of quantity supplied, represented by a movement upward along the existing supply curve.

The correct response highlights that an increase in the market price of a commodity, assuming all non-price factors remain constant (ceteris paribus), causes an expansion of quantity supplied. Graphically, this is shown as an upward movement along the existing supply curve rather than a shift of the curve itself.

Step-by-Step Solution

1

Identify the primary cause of the producer reaction

The change is triggered solely by an increase in the market price of the commodity itself, while all non-price determinants are held constant (ceteris paribus).

The law of supply specifically defines the direct relationship between price and quantity supplied.

2

Distinguish between a change in quantity supplied and a change in supply

A change in own-price leads to a movement along an existing supply curve, whereas changes in non-price factors shift the entire curve.

Graphical representation of price-quantity relationships keeps the supply schedule static when non-price parameters do not change.

3

Determine the direction of the movement along the curve

Since price increased, producers supply a larger quantity, resulting in an upward movement along the positive-sloped supply curve (an expansion of quantity supplied).

Higher market prices provide higher revenue incentives, motivating firms to increase output along their current cost and supply structure.

Key Concept

Law of Supply and Movement Along the Supply Curve

Question 9447Question →

The international monetary transactions for an open economy during a given fiscal year are summarized below:

Item	Amount ($ Millions)
Merchandise Exports	$820
Merchandise Imports	$950
Shipping and Freight Services Paid to Foreign Companies	$45
Income Received from Foreign Tourism	$110
Interest Received on Overseas Investments	$35
Foreign Direct Investment Inflows	$250
Remittances Received from Citizens Abroad	$60

Based on the table above, what is the country's Current Account balance and the status of its Balance of Trade?

Current Account surplus of

30 million; Balance of Trade deficit of

130 million

Current Account surplus of

280 million; Balance of Trade deficit of

130 million

Current Account deficit of

130 million; Balance of Trade surplus of

30 million

Current Account surplus of

235 million; Balance of Trade deficit of

85 million

Show answer & explanation

Answer: Current Account surplus of $30 million; Balance of Trade deficit of$ 130 million

Answer

Current Account surplus of

30 million; Balance of Trade deficit of

130 million

The correct answer accurately calculates the Balance of Trade as the difference between merchandise exports (

820m) and merchandise imports (

950m), yielding a deficit of

130m. It then combines this with net invisibles (

110m tourism +

35m interest +

60m remittances -

45m freight = +

160m) to arrive at a Current Account surplus of

30m. Foreign Direct Investment (

250m) is properly excluded as a financial account item.

Step-by-Step Solution

1

Calculate the Balance of Trade (Visible Trade Balance)

Balance of Trade = Merchandise Exports (

820m) - Merchandise Imports (

950m) = -

130 million (Deficit of

130 million).

Balance of Trade accounts exclusively for visible goods exported and imported.

2

Identify and sum the Net Invisibles and Unilateral Current Transfers

Net Invisibles = Foreign Tourism Receipts (+

110m) + Interest Received (+

35m) + Remittances Received (+

60m) - Freight Services Paid (-

45m) = +$160 million.

Services, investment income, and remittances are recorded under the invisible and secondary income components of the current account.

3

Filter out non-current account transactions

Foreign Direct Investment Inflows ($250 million) is classified under the Capital and Financial Account, so it must be excluded from the Current Account calculation.

Capital flows representing ownership of assets belong to the financial account, not the current account.

4

Calculate the Total Current Account Balance

Current Account Balance = Balance of Trade (-

130m) + Net Invisibles (+

160m) = +

30 million (Surplus of

30 million).

The Current Account balance combines the visible trade balance with net invisibles and net current transfers.

Key Concept

Structure of Balance of Payments: Distinguishing Current Account components (Visible Trade, Services, Primary Income, Secondary Income) from Capital and Financial Account components.

Question 9448Question →

Adolph Wagner's Law of Increasing State Activity posits that economic growth leads to an expansion of the public sector relative to total national output. Which of the following factors primarily drives this long-term structural increase in government expenditure according to Wagner's hypothesis?

Increased societal demand for infrastructure, education, and regulatory functions as economic development creates complex industrial societies

Sudden social crises or wars that temporarily increase public expenditure and permanently shift taxpayers' tolerance levels upward

Automatic increases in nominal state spending caused by price inflation without any expansion in real public goods or services

The assumption that expansion in gross domestic product automatically improves general economic development without requiring government intervention

Show answer & explanation

Answer: Increased societal demand for infrastructure, education, and regulatory functions as economic development creates complex industrial societies

Answer

The long-term structural expansion of government expenditure under Wagner's Law is primarily driven by increased societal demand for infrastructure, legal regulatory frameworks, and social welfare services resulting from economic growth and structural transformation.

According to Adolph Wagner's Law of Increasing State Activity, as an economy develops and per capita income rises, the public sector naturally expands to handle increasing social friction, administrative requirements, infrastructure projects, and welfare demands. Thus, the continuous structural demand for public goods and regulation is the main driver of growth in public spending relative to national income.

Step-by-Step Solution

1

Identify the core theoretical framework specified in the prompt

The prompt asks about Wagner's Law of Increasing State Activity regarding the long-term determinants of public expenditure growth.

Understanding the foundational mechanism of Wagner's law is necessary to distinguish it from alternative theories of government spending expansion.

2

Analyze Wagner's functional explanation for government growth

Wagner observed that as nations industrialize and income per capita rises, society becomes more complex, requiring higher state expenditure on law and order, transportation infrastructure, education, and social protection.

Wagner asserted that public sector expenditure has an income elasticity of demand greater than one, making public sector expansion an organic outcome of economic modernization.

3

Differentiate Wagner's hypothesis from Peacock-Wiseman and inflationary effects

While Peacock-Wiseman attributes spending shifts to emergency displacement effects and inflation affects nominal accounting, Wagner emphasizes continuous structural development demand.

Comparing alternative models eliminates distractor explanations that relate to crisis expenditure or price-level adjustments.

Key Concept

Wagner's Law of Increasing State Activity

Question 9449Question →

An economy operating under a medium-term development plan targets an annual real GDP growth rate of $8\%$ . If the country's incremental capital-output ratio (ICOR) is estimated at $4$ and the current domestic savings rate is $18\%$ of GDP, what is the domestic savings gap (additional savings rate required) to achieve the target growth rate according to the Harrod-Domar growth model?

14\%

2\%

32\%

50\%

Show answer & explanation

Answer: $14\%$

Answer

The domestic savings gap required to achieve the targeted growth rate is

14\%

.

According to the Harrod-Domar growth model, economic growth (

g

) is determined by the savings ratio (

s

) divided by the incremental capital-output ratio (

k

), expressed as

g = \frac{s}{k}

. Rearranging to find total required savings gives

s = g \times k = 8\% \times 4 = 32\%

. Since the economy currently saves

18\%

of GDP, the additional savings required to fulfill the plan (the savings gap) is

32\% - 18\% = 14\%

.

Step-by-Step Solution

1

Identify the given variables in the Harrod-Domar growth model formula.

Target growth rate (

g

) =

8\%

, Incremental Capital-Output Ratio (

k

) =

4

, Current domestic savings rate (

s_{current}

) =

18\%

.

The Harrod-Domar model states that the economic growth rate

g = \frac{s}{k}

, where

s

is the total required national savings rate and

k

is the ICOR.

2

Calculate the total required savings rate (

s_{required}

).

s_{required} = g \times k = 8\% \times 4 = 32\%

.

To generate an

8\%

growth rate given that

4

units of capital produce

1

unit of output, total savings must equal

32\%

of GDP.

3

Compute the domestic savings gap.

Savings Gap =

s_{required} - s_{current} = 32\% - 18\% = 14\%

.

The savings gap measures the shortfall between total required investment/savings and currently available domestic savings.

Key Concept

Harrod-Domar Growth Model and Savings Gap Calculation

Question 9450Question →

An economy operating on its Production Possibility Curve produces two goods: Rice (in tonnes) and Tractors (in units). Currently, it produces $40$ tractors and $100$ tonnes of rice. When resources are reallocated to increase tractor production to $50$ units, rice production falls to $70$ tonnes. What is the opportunity cost of producing one additional tractor, expressed in tonnes of rice?

Show answer & explanation

Answer: 3

Answer

The opportunity cost of producing one additional tractor is 3 tonnes of rice.

Along a Production Possibility Curve, the opportunity cost of producing an extra unit of one commodity is measured by the amount of the alternative commodity given up divided by the gain in the specified commodity. Sacrificing

30

tonnes of rice to obtain

10

additional tractors yields an opportunity cost of

3

tonnes of rice per tractor.

Step-by-Step Solution

1

Determine the change in tractor output (good gained)

\Delta \text{Tractors} = 50 - 40 = 10\text{ units}

To find per-unit opportunity cost, first calculate the total increase in tractor output.

2

Determine the change in rice output (good sacrificed)

\Delta \text{Rice} = 100 - 70 = 30\text{ tonnes}

Opportunity cost represents the quantity of alternative output foregone.

3

Calculate the marginal rate of transformation / opportunity cost per unit

\text{Opportunity Cost per tractor} = \frac{30}{10} = 3\text{ tonnes of rice}

Dividing the sacrificed amount of rice by the additional tractors produced gives the cost per extra tractor.

Key Concept

Opportunity Cost and Marginal Rate of Transformation on the PPC

Question 9451Question →

Match each economic receipt under the income method of measuring national income with its appropriate factor income classification or accounting treatment.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Wages and salaries paid to factory employees matches Compensation of employees; Rental income earned by property owners matches Operating surplus (Rent); Interest received on productive capital investments matches Operating surplus (Net interest); Old-age pensions paid by the government matches Transfer payment (Excluded from national income).

Under the income method, national income is measured by adding up all factor incomes (compensation of employees, rent, interest, profit, and self-employment income) earned by factors of production, while excluding transfer payments like pensions which are unearned receipts.

Step-by-Step Solution

1

Distinguish between factor income (payments for productive services) and transfer payments (unearned receipts).

Wages, rent, and interest are productive factor incomes, while pensions are non-factor transfer receipts.

The income method only sums earnings generated from the current production of goods and services.

2

Classify each factor income into its designated income category.

Labor returns are Compensation of Employees; land and capital returns belong under Operating Surplus; government relief/pensions are Excluded Transfer Payments.

This alignment reflects standard national income accounting framework rules.

Key Concept

Factor Income Classifications and Transfer Payment Exclusions in the Income Approach

Question 9452Question →

Match each fundamental property of a standard indifference curve on the left with its underlying economic principle or theoretical implication on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Downward slope maps to the negative substitution trade-off; Convexity to origin maps to diminishing

MRS_{xy}

; Higher curve placement maps to greater total utility; Inability of curves to intersect maps to preference transitivity.

Each property directly derives from consumer preference axioms. The downward slope stems from commodity trade-offs, convexity stems from diminishing marginal rates of substitution, higher positioning signifies superior satisfaction levels under non-satiation, and non-intersection upholds transitivity in consumer choices.

Step-by-Step Solution

1

Identify the economic rationale for slope

A negative slope indicates that the two commodities are substitutes in consumption.

To remain on the same utility level while gaining more of one commodity, the consumer must sacrifice some of the other commodity.

2

Determine the cause of curvature

Convexity implies that the slope (

MRS_{xy}

) falls continuously as one moves down the curve.

As consumption of Good

X

increases, its marginal utility (

MU_x

) relative to Good

Y

(

MU_y

) decreases.

3

Analyze position and intersection rules

Higher curves contain superior bundles, and crossing curves violate logical preference ordering.

Monotonicity ensures higher curves offer more utility, while transitivity requires that if bundle A equals B and B equals C, then A must equal C.

Key Concept

Properties of indifference curves in ordinal utility theory

Question 9453Question →

In international economics, terms of trade can be expressed through various metrics depending on whether price levels, physical quantities, or factor productivities are being evaluated. Match each Terms of Trade concept on the left with its correct mathematical representation on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Gross Barter Terms of Trade matches

\left(\frac{Q_m}{Q_x}\right) \times 100

; Income Terms of Trade matches

\left(\frac{P_x}{P_m}\right) \times Q_x

; Single Factoral Terms of Trade matches

\left(\frac{P_x}{P_m}\right) \times Z_x

; Double Factoral Terms of Trade matches

\left(\frac{P_x}{P_m}\right) \times \left(\frac{Z_x}{Z_m}\right)

.

Each Terms of Trade concept correctly aligns with its economic formula: Gross Barter measures physical volume ratios, Income Terms of Trade calculates total import purchasing capacity based on export revenue, Single Factoral accounts for domestic export productivity improvements, and Double Factoral accounts for relative productivity between domestic and foreign trading sectors.

Step-by-Step Solution

1

Analyze the scope and variables of each Terms of Trade metric.

Gross Barter uses physical volume indices (

Q_m, Q_x

); Income Terms of Trade measures total import capacity using export volume (

Q_x

); Single Factoral adjusts for export productivity (

Z_x

); Double Factoral adjusts for both export (

Z_x

) and import (

Z_m

) productivities.

Different concepts refine commodity terms of trade to account for volume changes and factor productivity changes.

2

Match each economic concept with its precise algebraic formula.

Gross Barter

\rightarrow \left(\frac{Q_m}{Q_x}\right) \times 100

, Income Terms of Trade

\rightarrow \left(\frac{P_x}{P_m}\right) \times Q_x

, Single Factoral

\rightarrow \left(\frac{P_x}{P_m}\right) \times Z_x

, Double Factoral

\rightarrow \left(\frac{P_x}{P_m}\right) \times \left(\frac{Z_x}{Z_m}\right)

.

These formulas directly correspond to the classical definitions of international trade metrics.

Key Concept

Classification and Formulation of Terms of Trade Metrics

Question 9454Question →

Fill in the blanks to complete the statement regarding Nigeria's major macroeconomic reform policies.

Fill in the blanks below

Adopted in 1986 to mitigate severe fiscal deficits and economic distortion, Nigeria's shifted policy emphasis from direct state control toward market-driven allocation, placing significant priority on trade liberalization and the privatization of .

Show answer & explanation

Answer

The first blank requires 'Structural Adjustment Programme' (or 'SAP'), and the second blank requires 'public enterprises' (or 'state-owned enterprises').

The Structural Adjustment Programme (SAP), introduced in 1986, represented a structural shift in Nigeria's macroeconomic management away from state regulation toward market deregulation, trade liberalization, exchange rate floatation, and the privatization of inefficient public enterprises.

Step-by-Step Solution

1

Identify the core reform framework introduced in Nigeria in 1986.

The reform package introduced in July 1986 under the Babangida administration was the Structural Adjustment Programme (SAP).

SAP was enacted to reverse Nigeria's dependency on crude oil exports and address balance of payments crises caused by falling oil revenues.

2

Identify the specific institutional entities targeted for market transfer under SAP.

The policy targeted public enterprises (state-owned enterprises) for privatization and commercialization.

State-owned corporations were considered inefficient, fiscally unsustainable, and dependent on state subsidies, prompting state divestment to enhance productivity.

Key Concept

Structural Adjustment Programme (SAP) and Privatization in Nigeria

Estimated Time:1m 30s

Question 9455Question →

A monopolist faces a market demand function given by $P = 180 - 3Q$ , where $P$ is the price in Naira and $Q$ is the output quantity. The firm operates with a total cost function of $TC = 100 + 20Q + Q^2$ . If a regulatory authority forces the monopolist to adopt marginal cost pricing ( $P = MC$ ) to achieve economic efficiency, by how many units will the firm's output increase compared to its unregulated profit-maximizing output?

12

units

32

units

20

units

8

units

Show answer & explanation

Answer: $12$ units

Answer

The firm's output will increase by 12 units.

Under unregulated monopoly profit maximization, the firm sets

MR = MC

, yielding an output of

Q = 20

units. Under marginal cost pricing (

P = MC

), output expands to

Q = 32

units to eliminate deadweight loss. The difference between these two output levels is

32 - 20 = 12

units.

Step-by-Step Solution

1

Derive the Marginal Revenue (MR) and Marginal Cost (MC) functions.

Total Revenue

TR = P \times Q = (180 - 3Q)Q = 180Q - 3Q^2

, so

MR = \frac{dTR}{dQ} = 180 - 6Q

. Given

TC = 100 + 20Q + Q^2

,

MC = \frac{dTC}{dQ} = 20 + 2Q

.

MR and MC are required to find the profit-maximizing output condition for the unregulated firm.

2

Determine the unregulated monopoly output (

Q_M

).

Set

MR = MC \implies 180 - 6Q = 20 + 2Q \implies 8Q = 160 \implies Q_M = 20

units.

A profit-maximizing monopolist produces where marginal revenue equals marginal cost.

3

Determine the output under marginal cost pricing (

Q_C

).

Set

P = MC \implies 180 - 3Q = 20 + 2Q \implies 5Q = 160 \implies Q_C = 32

units.

Marginal cost pricing forces price to equal marginal cost, replicating the competitive socially optimal output level.

4

Calculate the increase in output.

Increase in output

= Q_C - Q_M = 32 - 20 = 12

units.

Subtract the unregulated output from the regulated output to find the change.

Key Concept

Monopoly Output Determination vs Socially Optimal Output

Question 9456Question →

A rubber manufacturing firm in Ogun State utilizes a fixed capacity of raw latex and machinery to produce either industrial conveyor belts or motorcycle tires. If a surge in mining activities leads to a significant increase in the market price of industrial conveyor belts, what is the immediate effect on the market for motorcycle tires?

The supply curve of motorcycle tires will shift to the right because the two goods are in joint supply.

The supply curve of motorcycle tires will shift to the left because the two goods are in competitive supply.

The quantity supplied of motorcycle tires will increase along its supply curve due to derived supply.

The supply of motorcycle tires will remain unchanged because the products serve completely different consumer markets.

Show answer & explanation

Answer: The supply curve of motorcycle tires will shift to the left because the two goods are in competitive supply.

Answer

The supply curve of motorcycle tires will shift to the left because the two goods are in competitive supply.

The correct answer states that the supply curve of motorcycle tires shifts to the left due to competitive supply. When two goods rely on the same factor inputs, an increase in the market price of one good makes its production more profitable, causing producers to reallocate factors of production away from the alternative good, thereby shifting its supply curve inward.

Step-by-Step Solution

1

Identify the relationship between the two goods on the supply side

Industrial conveyor belts and motorcycle tires use the same pool of limited inputs (raw latex, machinery, labor), meaning they are in competitive (or alternative) supply.

When inputs can be switched between producing Good X or Good Y, the goods compete for production resources.

2

Analyze the producer response to the price change of industrial conveyor belts

The higher market price of conveyor belts increases their relative profitability, prompting the firm to shift resources toward producing conveyor belts.

Profit-maximizing producers allocate resources to goods offering higher returns.

3

Determine the impact on the supply of motorcycle tires

Fewer resources are dedicated to motorcycle tires, leading to a decrease in supply (a leftward shift of the supply curve) at every price level.

A reduction in available production inputs decreases total supply.

Key Concept

Competitive Supply

Estimated Time:1m 30s

Question 9457Question →

In a given trade cycle, a nation establishes its base year export price index, import price index, and export volume index all at $100$ . In the current year, export prices rise by $25\%$ , import prices rise by $50\%$ , and the volume of exports increases by $20\%$ . What is the nation's Income Terms of Trade ( $ITT$ ) for the current year, and what does this imply about its total capacity to import?

100.0

, implying that the nation's overall capacity to import remains unchanged relative to the base year.

144.0

, implying that the nation's overall capacity to import has increased by

44\%

relative to the base year.

83.3

, implying that the nation's overall capacity to import has declined by

16.7\%

relative to the base year.

103.3

, implying that the nation's overall capacity to import has increased by

3.3\%

relative to the base year.

Show answer & explanation

Answer: $100.0$ , implying that the nation's overall capacity to import remains unchanged relative to the base year.

Answer

The Income Terms of Trade for the current year is

100.0

, indicating that the nation's total capacity to import remains unchanged compared to the base year.

The Income Terms of Trade measures a country's total capacity to import by adjusting its price ratio (

NB\,TOT

) by the quantity of exports (

Q_x

). Given

P_x = 125

,

P_m = 150

, and

Q_x = 120

, the calculation

\left(\frac{125}{150}\right) \times 120 = 100.0

confirms that the physical volume expansion of exports fully counteracts the worsening unit price ratio, leaving the country's overall purchasing power for imports unchanged.

Step-by-Step Solution

1

Calculate the current period export price index (

P_x

) and import price index (

P_m

).

P_x = 100 + (0.25 \times 100) = 125

;

P_m = 100 + (0.50 \times 100) = 150

.

Percentage increases are added to the base year index of 100.

2

Determine the current period export volume index (

Q_x

).

Q_x = 100 + (0.20 \times 100) = 120

.

The volume of exports expanded by 20% over the base index.

3

Apply the Income Terms of Trade formula:

ITT = \left(\frac{P_x}{P_m}\right) \times Q_x

.

ITT = \left(\frac{125}{150}\right) \times 120 = \frac{5}{6} \times 120 = 100.0

.

Income Terms of Trade measures a country's physical capacity to import based on export earnings.

4

Interpret the resulting index in comparison to the base year value of 100.

Since

ITT = 100.0

, the nation's total capacity to import is equal to that of the base year.

An index of 100 signifies no net change in real import purchasing power.

Key Concept

Income Terms of Trade (

ITT

) and Capacity to Import

Question 9458Question →

Match each balance of payments policy action on the left with the correct economic mechanism on the right used to address a deficit.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Import quotas match direct trade restrictions; increase in bank reserve requirements matches monetary contraction; currency devaluation matches exchange rate alteration; and reduction in public spending matches fiscal contraction.

Each adjustment measure correctly pairs with its economic operation: import quotas use administrative volume limits to restrict imports; higher reserve requirements suppress monetary growth to reduce total spending; devaluation uses relative price shifts to switch consumption to domestic products; and cutting public spending reduces aggregate demand via fiscal tightening.

Step-by-Step Solution

1

Analyze commercial trade policies

Import quotas restrict foreign entry directly, classifying them as direct trade expenditure-switching tools.

Quotas physically limit import volume rather than acting through price or income controls.

2

Analyze monetary policy instruments

Increasing reserve requirements shrinks money supply and credit creation capacity.

This is an expenditure-reducing monetary measure designed to curb aggregate demand.

3

Analyze exchange rate policies

Currency devaluation modifies relative prices between domestic and foreign goods.

Making foreign goods relatively expensive encourages buyers to switch demand to local substitutes.

4

Analyze fiscal policy instruments

Reducing public expenditure lowers government spending and overall national income.

Lower domestic absorption decreases overall expenditure on imported products.

Key Concept

Classification of Balance of Payments Adjustment Policies

Estimated Time:1m 0s

Question 9459Question →

Suppose two indifference curves, $IC_1$ and $IC_2$ , representing a consumer's preferences for Good $X$ and Good $Y$ , intersect at bundle $P$ . Bundle $Q$ lies solely on $IC_1$ , and bundle $R$ lies solely on $IC_2$ , with bundle $R$ containing strictly more of both goods than bundle $Q$ . Which fundamental economic assumption of ordinal utility theory is violated by this intersection, and what is its logical consequence?

The axiom of transitivity and monotonic preferences; it creates a contradiction where a bundle with more goods yields the same satisfaction as a bundle with fewer goods.

The law of diminishing marginal rate of substitution; it causes the marginal rate of substitution to remain constant along both curves regardless of bundle composition.

The principle of total utility maximization; it forces marginal utility to drop to zero at the point of intersection.

The assumption of diminishing returns; it causes the budget line to become concave relative to the origin.

Show answer & explanation

Answer: The axiom of transitivity and monotonic preferences; it creates a contradiction where a bundle with more goods yields the same satisfaction as a bundle with fewer goods.

Answer

The axiom of transitivity and monotonic preferences; it creates a contradiction where a bundle with more goods yields the same satisfaction as a bundle with fewer goods.

Indifference curves cannot intersect because such an intersection violates the axiom of transitivity and monotonic preferences. If two curves intersect at a common point, transitive logic forces any two distinct bundles on those separate curves to yield equal satisfaction. However, if one bundle contains more of both commodities, monotonic preference requires it to yield strictly higher utility, producing a direct logical contradiction.

Step-by-Step Solution

1

Analyze the preference relations defined by the intersection point

P

Since

P

lies on both

IC_1

and

IC_2

, the consumer is indifferent between

P

and

Q

(

P \sim Q

), and also indifferent between

P

and

R

(

P \sim R

).

By definition, all points on a single indifference curve yield equal total utility.

2

Apply the axiom of transitivity

If

Q \sim P

and

P \sim R

, transitivity requires that

Q \sim R

.

Transitivity dictates consistent ordering of consumer preferences across combinations.

3

Compare the bundles

Q

and

R

using monotonic preferences (non-satiation)

Since bundle

R

contains strictly more of both goods than bundle

Q

, monotonic preference implies

R

must be strictly preferred to

Q

(

R \succ Q

).

Consumers prefer combinations with larger quantities of goods.

4

Identify the logical contradiction

The deduction

Q \sim R

directly contradicts

R \succ Q

, proving that indifference curves can never intersect under standard rational preference axioms.

Intersecting indifference curves destroy the logical consistency of preference ordering.

Key Concept

Non-intersection of Indifference Curves and Transitivity Axiom

Question 9460Question →

In a given fiscal year, the national accounts of a nation reveal the following expenditure figures: Personal consumption spending ( $C$ ) is $\$400$ billion, gross private domestic investment ( $I$ ) is $\$150$ billion, government expenditures ( $G$ ) total $\$120$ billion, exports ( $X$ ) stand at $\$80$ billion, and imports ( $M$ ) are $\$50$ billion. Calculate the Gross Domestic Product (GDP) of the nation in billions of dollars using the expenditure approach.

Show answer & explanation

Answer: 700

Answer

The Gross Domestic Product (GDP) of the nation calculated using the expenditure approach is $700 billion.

The expenditure approach determines GDP by combining aggregate spending components:

GDP = C + I + G + (X - M)

. Substituting the given values yields:

GDP = 400 + 150 + 120 + (80 - 50) = 700

billion dollars.

Step-by-Step Solution

1

Identify the formula for calculating Gross Domestic Product (GDP) via the expenditure approach

GDP = C + I + G + (X - M)

The expenditure method sums all final expenditures on goods and services within an economy.

2

Calculate net exports by subtracting imports (M) from exports (X)

Net Exports =

80 billion -

50 billion = $30 billion

Imports represent expenditures on foreign-produced goods and must be subtracted to isolate domestic output.

3

Add consumption spending (C), investment (I), government spending (G), and net exports (X - M)

GDP =

400 billion +

150 billion +

120 billion +

30 billion = $700 billion

Combining total spending across all macroeconomic sectors yields the aggregate Gross Domestic Product.

Key Concept

Expenditure Method of Measuring GDP

Answer

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