CUET UG Booster Economics 5 Test (D3) -

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CUET UG Booster Economics 5 Test (D3)

⏱️ 30 Minutes

❓ 20 Questions

📌 Answers are locked once submitted — results and explanations appear at the end.

CUET UG Booster Economics 5 Test (D3)

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QUESTION 1 OF 20

Match the corresponding decisions and market aggregations:

List 1	List 2
1. Individual Firm's decision	a. Aggregation of individual firm demands
2. Individual Household's decision	b. Aggregation of individual household supplies
3. Market demand for labour	c. Based exclusively on profit maximization
4. Market supply of labour	d. Based strictly on the income-leisure trade-off

Answer Review

1 Match the corresponding decisions and market aggregations:

List 1	List 2
1. Individual Firm's decision	a. Aggregation of individual firm demands
2. Individual Household's decision	b. Aggregation of individual household supplies
3. Market demand for labour	c. Based exclusively on profit maximization
4. Market supply of labour	d. Based strictly on the income-leisure trade-off

A 1-a, 2-b, 3-c, 4-d

B 1-c, 2-d, 3-a, 4-b

C 1-d, 2-c, 3-b, 4-a

D 1-b, 2-a, 3-d, 4-c

💡 Short Explanation

Individual firms hire labour to maximize profits. Households decide labour supply by balancing income and leisure. Market curves are obtained by aggregating individual decisions.

✅ Correct Answer Explanation

A firm's labour demand is a derived demand because labour is hired to produce goods and services for profit. Therefore, an individual firm's decision is based on profit maximization (c). An individual household decides how much labour to supply by choosing between income and leisure (d). The market demand for labour is the horizontal aggregation of all individual firms' labour demand curves (a). Similarly, the market supply of labour is obtained by aggregating the labour supplied by all households (b). Thus the correct matching is: 1 → c 2 → d 3 → a 4 → b Hence, Option B is correct.

❓ Why Other Options Are Incorrect

Option A → Incorrect because an individual firm's decision is not an aggregation; aggregation applies only to the market demand curve.
Option C → Incorrect because it wrongly swaps the objectives of firms and households.
Option D → Incorrect because it reverses both individual and market relationships.

🎯 Strategy

Used

Option Grouping

Application:

Match each economic agent with its primary objective before identifying the market aggregation.

Final Logic:

Firm → Profit, Household → Income-Leisure, Market → Aggregation.

🧠 Memory Trick

Firm = Profit | Household = Leisure | Market = Aggregate

📚 Class XI – Introductory Microeconomics – Chapter: Theory of Consumer Behaviour & Production and Costs (Labour Market Concepts) – Topic: Labour Demand and Labour Supply

2 In analyzing the demand for labour by a single firm, what fundamental assumption is made about the non-labour factors of production?

A They are completely variable in the short run.

B They naturally change proportionately with labour.

C They directly determine the prevailing wage rate.

D They are considered fixed or constant (labour is the only variable factor).

💡 Short Explanation

Labour is treated as the variable input. Other factors remain fixed in the short run. This allows MPL to be analysed.

✅ Correct Answer Explanation

When deriving the firm's labour demand curve, the analysis assumes that labour is the only variable factor of production, while inputs such as capital, machinery, and land remain fixed in the short run. Keeping other inputs constant makes it possible to study how output changes when additional labour is employed. This leads to the Law of Diminishing Marginal Product, which forms the basis of the firm's downward-sloping labour demand curve. Therefore, Option D is correct.

❓ Why Other Options Are Incorrect

Option A → Incorrect because all inputs do not become variable in the short run.
Option B → Incorrect because non-labour inputs are assumed to remain constant, not change proportionately.
Option C → Incorrect because the wage rate is determined by the labour market, not by fixed factors of production.

🎯 Strategy

Used

Elimination

Application:

Reject statements inconsistent with the short-run production assumption.

Final Logic:

Only labour varies; all other inputs remain fixed.

🧠 Memory Trick

Short Run = Labour Variable, Capital Fixed

📚 Class XI – Introductory Microeconomics – Chapter: Production and Costs – Topic: Short Run Production Function and Variable Factor

3 The core of an individual household's labour supply decision is essentially a continuous choice between ________ and ________.

A income, leisure

B profit, loss

C demand, supply

D revenue, cost

💡 Short Explanation

Households allocate time. More work earns more income. More leisure reduces labour supplied.

✅ Correct Answer Explanation

Households decide how many hours to work by comparing the benefits of earning income with the satisfaction obtained from enjoying leisure. This is known as the income-leisure trade-off. As wages change, individuals adjust the balance between working and leisure depending on substitution and income effects. Hence, Option A is correct.

❓ Why Other Options Are Incorrect

Option B → Profit and loss are business concepts, not household labour supply decisions.
Option C → Demand and supply are market concepts, not the individual's choice variables.
Option D → Revenue and cost relate to firms, not household labour supply.

🎯 Strategy

Used

Contextual/Tonal Matching

Application:

Identify the concept specifically related to household labour supply.

Final Logic:

Households choose between earning income and enjoying leisure.

🧠 Memory Trick

Work → Income | Rest → Leisure

📚 Class XI – Introductory Microeconomics – Chapter: Market Equilibrium – Topic: Household Labour Supply and Income-Leisure Choice

4 Arrange the sequential dynamics of the substitution effect dominating in labour supply:
1. The market wage rate rises.
2. The opportunity cost of leisure becomes costlier.
3. The individual decides to enjoy less leisure.
4. The individual supplies more hours of labour.

A 2, 1, 4, 3

B 1, 3, 2, 4

C 3, 4, 1, 2

D 1, 2, 3, 4

💡 Short Explanation

Higher wages increase the value of working. Leisure becomes more expensive. Labour supplied increases.

✅ Correct Answer Explanation

When the wage rate rises, each hour of leisure means giving up more potential income. Therefore, the opportunity cost of leisure increases. Individuals substitute leisure with work by enjoying less leisure and supplying more hours of labour. Thus, the logical order is: 1 → Wage rises 2 → Leisure becomes costlier 3 → Less leisure is chosen 4 → More labour is supplied Hence, Option D is correct.

❓ Why Other Options Are Incorrect

Option A → Starts with the consequence instead of the cause.
Option B → Places the reduction in leisure before the increase in its opportunity cost.
Option C → Reverses the logical sequence.

🎯 Strategy

Used

Contextual/Tonal Matching

Application:

Follow the cause-and-effect relationship from wage increase to labour supply.

Final Logic:

Higher wage → Costlier leisure → Less leisure → More labour.

🧠 Memory Trick

Wage ↑ → Leisure ↓ → Labour ↑

📚 Class XI – Introductory Microeconomics – Chapter: Market Equilibrium – Topic: Labour Supply and Substitution Effect

5 If the current wage rate is w1, and VMPL > w1, what operational step must the perfectly competitive firm take to maximize profits?

A Decrease the price of the produced good.

B Fire existing workers to reduce total cost.

C Hire more units of labour.

D Halt all production entirely.

💡 Short Explanation

A firm compares VMPL with the wage rate. If VMPL > w, an additional worker contributes more revenue than cost. The firm hires more labour until VMPL = w.

✅ Correct Answer Explanation

A perfectly competitive firm follows the profit-maximizing rule: VMPL = w where: VMPL = Value of Marginal Product of Labour w = Wage rate If VMPL > w, the additional revenue generated by employing one more worker is greater than the wage paid. Therefore, hiring another worker increases profit. The firm continues hiring labour until: VMPL = w Thus, Option C is correct.

❓ Why Other Options Are Incorrect

Option A → Incorrect because the firm is a price taker and cannot change the market price of its product.
Option B → Incorrect because reducing labour when VMPL > w decreases profit.
Option D → Incorrect because production is still profitable.

🎯 Strategy

Used

Substitution

Application:

Compare VMPL with the wage rate using the firm's profit-maximization rule.

Final Logic:

Since VMPL > w, the firm should hire more labour.

🧠 Memory Trick

VMPL > Wage ⇒ Hire More

📚 Class XI – Introductory Microeconomics – Chapter: Market Equilibrium – Topic: Profit Maximization in the Labour Market

6 Which of the following statements is exclusively true for the determination of the market wage?

A Individual firms unilaterally set it based on their profit margins.

B Individual households demand and dictate a specific minimum wage.

C The central government rigidly sets it universally for all sectors.

D It is determined strictly at the point where total market demand for labour equals total market supply.

💡 Short Explanation

Market wage is determined by demand and supply. Individual firms and households are wage takers. Equilibrium occurs where labour demand equals labour supply.

✅ Correct Answer Explanation

In a competitive labour market, the wage rate is determined through the interaction of market demand for labour and market supply of labour. Labour demand comes from firms. Labour supply comes from households. The equilibrium wage is determined where: Demand for Labour = Supply of Labour Neither an individual firm nor an individual household can determine the market wage independently. Therefore, Option D is correct.

❓ Why Other Options Are Incorrect

Option A → Individual firms are wage takers.
Option B → Individual households cannot determine the market wage.
Option C → Government may fix minimum wages, but competitive market wage is determined by demand and supply.

🎯 Strategy

Used

Elimination

Application:

Eliminate options assigning wage determination to individual agents.

Final Logic:

Market wage is determined where labour demand equals labour supply.

🧠 Memory Trick

Demand = Supply ⇒ Wage Fixed

📚 Class XI – Introductory Microeconomics – Chapter: Market Equilibrium – Topic: Determination of Wage Rate

7 As a firm continually employs more and more labour while holding all other inputs fixed, the Marginal Product of Labour (MPL) will eventually:

A Remain perfectly constant

B Fall (diminish)

C Increase infinitely

D Become exactly equal to the output price

💡 Short Explanation

Labour is the only variable input. Other inputs remain fixed. Diminishing marginal product eventually occurs.

✅ Correct Answer Explanation

The Law of Diminishing Marginal Product states that when more units of labour are employed while keeping other inputs fixed, each additional worker eventually contributes less additional output than the previous worker. Therefore, the Marginal Product of Labour (MPL) eventually declines. This declining MPL is one of the major reasons behind the downward-sloping labour demand curve. Hence, Option B is correct.

❓ Why Other Options Are Incorrect

Option A → Incorrect because MPL cannot remain constant indefinitely under fixed inputs.
Option C → Incorrect because productivity cannot increase indefinitely when other factors are fixed.
Option D → Incorrect because MPL measures physical output, whereas price is a monetary variable.

🎯 Strategy

Used

Conceptual Elimination

Application:

Recall the Law of Diminishing Marginal Product and eliminate options that contradict it.

Final Logic:

Fixed inputs + More labour ⇒ MPL eventually falls.

🧠 Memory Trick

More Workers → Less Extra Output

📚 Class XI – Introductory Microeconomics – Chapter: Production and Costs – Topic: Law of Diminishing Marginal Product

8 Without the assumption of the law of diminishing marginal product, a firm's demand curve for labour would lose its characteristic shape and not necessarily be:

A Downward sloping

B Perfectly vertical

C Upward sloping

D U-shaped

💡 Short Explanation

Labour demand depends on VMPL. VMPL falls because MPL diminishes. Without diminishing MPL, labour demand need not slope downward.

✅ Correct Answer Explanation

The firm's labour demand curve is derived from the condition: w = VMPL Since VMPL = P × MPL and the commodity price remains constant under perfect competition, changes in VMPL depend entirely on MPL. The Law of Diminishing Marginal Product states that MPL falls as more labour is employed. Consequently, VMPL also falls, giving the labour demand curve its downward slope. Without the Law of Diminishing Marginal Product, this downward-sloping relationship would not necessarily hold. Therefore, Option A is correct.

❓ Why Other Options Are Incorrect

Option B → Incorrect because labour demand is not expected to become perfectly vertical.
Option C → Incorrect because the absence of diminishing MPL does not automatically imply an upward-sloping demand curve.
Option D → Incorrect because labour demand is not characterized by a U-shaped curve.

🎯 Strategy

Used

Conceptual Elimination

Application:

Recall that diminishing marginal product is the reason behind the downward-sloping labour demand curve.

Final Logic:

Diminishing MPL → Falling VMPL → Downward-sloping Labour Demand

🧠 Memory Trick

No Diminishing MPL → No Downward Demand

📚 Class XI – Introductory Microeconomics – Chapter: Market Equilibrium – Topic: Labour Demand Curve

9 Because the firm is assumed to be perfectly competitive, its marginal revenue is equal to the commodity price, meaning the Marginal Revenue Product of Labour (MRPL) effectively equals:

A Marginal Cost

B Value of marginal product of labour (VMPL)

C Total Revenue

D Market Wage rate

💡 Short Explanation

In perfect competition, MR = Price. MRPL = MR × MPL. Therefore, MRPL = VMPL.

✅ Correct Answer Explanation

The formula for Marginal Revenue Product of Labour is: MRPL = MR × MPL Under perfect competition: MR = Price Therefore, MRPL = Price × MPL = VMPL Thus, under perfect competition, MRPL and VMPL are equal. Hence, Option B is correct.

❓ Why Other Options Are Incorrect

Option A → Incorrect because marginal cost measures production cost, not revenue generated by labour.
Option C → Incorrect because total revenue is the firm's overall earnings, not the additional revenue from one worker.
Option D → Incorrect because wage equals VMPL only at equilibrium; wage itself is not MRPL.

🎯 Strategy

Used

Substitution

Application:

Replace MR with Price under perfect competition.

Final Logic:

MR = Price ⇒ MRPL = Price × MPL = VMPL

🧠 Memory Trick

Perfect Competition ⇒ MR = Price ⇒ MRPL = VMPL

📚 Class XI – Introductory Microeconomics – Chapter: Market Equilibrium – Topic: Marginal Revenue Product and Value of Marginal Product

10 Which of the following statements is/are mathematically correct for a perfectly competitive firm hiring labour?
I. The firm can noticeably influence the price of the commodity.
II. Marginal revenue exactly equals the price of the commodity.
III. MRPL = VMPL.

A II and III only

B I and II only

C I and III only

D I only

💡 Short Explanation

Perfectly competitive firms are price takers. MR = Price. Therefore, MRPL = VMPL.

✅ Correct Answer Explanation

Under perfect competition: The firm cannot influence the market price, so Statement I is false. Since the firm is a price taker, MR = Price Therefore, Statement II is true. Also, MRPL = MR × MPL Since MR = Price it follows that MRPL = Price × MPL = VMPL Therefore, Statement III is also true. Hence, Option A (II and III only) is correct.

❓ Why Other Options Are Incorrect

Option B → Incorrect because Statement I is false, although Statement II is true.
Option C → Incorrect because Statement I is false even though Statement III is true.
Option D → Incorrect because Statement I is false.

🎯 Strategy

Used

Option Grouping

Application:

Evaluate each statement individually before selecting the correct combination.

Final Logic:

Only Statements II and III satisfy the conditions of perfect competition.

🧠 Memory Trick

Price Taker ⇒ MR = P ⇒ MRPL = VMPL

📚 Class XI – Introductory Microeconomics – Chapter: Market Equilibrium – Topic: Perfect Competition and Labour Demand

11 The marginal revenue product of labour represents the additional benefit to the firm from a unit of labour. This specific benefit is measured intrinsically in terms of:

A Number of labourers hired

B Physical units of output

C Extra hours of work

D Added Revenue

💡 Short Explanation

MRPL measures the extra revenue earned by employing one additional unit of labour. It is a monetary concept, not a physical output measure. Formula: MRPL = MR × MPL

✅ Correct Answer Explanation

The Marginal Revenue Product of Labour (MRPL) refers to the additional revenue earned by a firm from employing one extra unit of labour. It is calculated as: MRPL = MR × MPL where: MR = Marginal Revenue MPL = Marginal Product of Labour Since MRPL measures additional revenue, it is expressed in monetary terms, not in physical units of output or labour hours. Therefore, Option D is correct.

❓ Why Other Options Are Incorrect

Option A → Incorrect because MRPL measures the revenue contribution of labour, not the number of workers employed.
Option B → Incorrect because physical units of output are measured by MPL, not MRPL.
Option C → Incorrect because extra hours of work represent labour input, not the revenue generated.

🎯 Strategy

Used

Dimensional/Unit Analysis

Application:

Identify the unit of measurement. Since MRPL is measured in money, eliminate options expressed in physical units or labour quantity.

Final Logic:

Revenue Product ⇒ Measured in Revenue ⇒ Added Revenue.

🧠 Memory Trick

MRPL = Money Earned by One More Worker

📚 Class XI – Introductory Microeconomics – Chapter: Market Equilibrium – Topic: Marginal Revenue Product of Labour (MRPL)

12 If a perfectly competitive firm produces a good sold at Price = Rs 20, and the given wage rate is w = Rs 100, what must the Marginal Product of Labour (MPL) be at the firm's profit-maximizing level of employment?

A 2

B 5

C 10

D 20

💡 Short Explanation

Profit maximization occurs where VMPL = w. Under perfect competition, VMPL = P × MPL Substitute the given values to calculate MPL.

✅ Correct Answer Explanation

For a perfectly competitive firm, VMPL = P × MPL At the profit-maximizing level, VMPL = w Given: P = Rs 20 w = Rs 100 Therefore, 20 × MPL = 100 So, MPL = 100 ÷ 20 = 5 Thus, the firm should employ labour until MPL = 5. Hence, Option B is correct.

❓ Why Other Options Are Incorrect

Option A → Incorrect because 20 × 2 = 40, which is less than the wage.
Option C → Incorrect because 20 × 10 = 200, which exceeds the wage.
Option D → Incorrect because 20 × 20 = 400, which is far above the equilibrium condition.

🎯 Strategy

Used

Substitution

Application:

Substitute the given values into
VMPL = w

Final Logic:

P × MPL = w ⇒ MPL = Wage ÷ Price = 100 ÷ 20 = 5

🧠 Memory Trick

MPL = Wage ÷ Price

📚 Class XI – Introductory Microeconomics – Chapter: Market Equilibrium – Topic: Profit Maximization Using VMPL

13 VMPL conceptually differs from MPL in that VMPL converts the output into:

A Absolute units of output

B Standardized hours of work

C Consumer Utility

D Monetary value (Revenue worth)

💡 Short Explanation

MPL measures physical output. VMPL measures the value of that output. VMPL is expressed in monetary terms.

✅ Correct Answer Explanation

The Marginal Product of Labour (MPL) measures the additional physical output produced by one extra worker. The Value of Marginal Product of Labour (VMPL) converts this physical output into monetary value by multiplying MPL by the commodity price. VMPL = P × MPL Thus, VMPL represents the revenue value generated by one additional unit of labour. Therefore, Option D is correct.

❓ Why Other Options Are Incorrect

Option A → Incorrect because physical output is measured by MPL, not VMPL.
Option B → Incorrect because VMPL is unrelated to working hours.
Option C → Incorrect because consumer utility is not used to calculate VMPL.

🎯 Strategy

Used

Dimensional/Unit Analysis

Application:

Determine whether the variable is measured in physical units or money.

Final Logic:

MPL = Output; VMPL = Value of Output.

🧠 Memory Trick

V = Value = Money

📚 Class XI – Introductory Microeconomics – Chapter: Market Equilibrium – Topic: Value of Marginal Product of Labour (VMPL)

14 Assertion (A): The firm will intentionally hire more labour if VMPL is less than the market wage rate.
Reason (R): If VMPL is less than the wage rate, the firm can explicitly increase its profit by reducing a unit of labour employed.

A Both false

B A true, R false

C Both true, R explains A

D A false, R true

💡 Short Explanation

Firms compare VMPL with the wage rate. If VMPL < w, labour costs exceed the additional revenue generated. The firm reduces employment to increase profit.

✅ Correct Answer Explanation

The firm's hiring rule is: If VMPL > w, hire more labour. If VMPL < w, reduce labour because the extra worker costs more than the revenue generated. Therefore: Assertion is false because the firm will not hire more labour when VMPL is less than the wage rate. Reason is true because reducing labour increases profit whenever VMPL < w. Hence, Option D is correct.

❓ Why Other Options Are Incorrect

Option A → Incorrect because the Reason is true.
Option B → Incorrect because the Assertion is false.
Option C → Incorrect because the Assertion itself is incorrect.

🎯 Strategy

Used

Elimination

Application:

Compare the Assertion with the firm's equilibrium rule:
VMPL = w

Final Logic:

VMPL < Wage ⇒ Reduce Labour

🧠 Memory Trick

Low VMPL ⇒ Lay Off

📚 Class XI – Introductory Microeconomics – Chapter: Market Equilibrium – Topic: Firm's Labour Hiring Rule

15 The downward sloping nature of the demand curve for labour graphically shows a direct inverse relationship between the:

A Wage rate and the quantity of labour demanded.

B Commodity price and the quantity of goods supplied.

C Wage rate and the total quantity of labour supplied.

D Marginal Product of Labour and Value of Marginal Product.

💡 Short Explanation

Wage is the price of labour. As wages rise, firms demand fewer workers. This creates a downward-sloping labour demand curve.

✅ Correct Answer Explanation

The firm's labour demand curve shows the relationship between the wage rate and the quantity of labour demanded. As the wage rate increases, employing additional workers becomes more expensive. Because of the Law of Diminishing Marginal Product, firms reduce the quantity of labour demanded until: w = VMPL Thus, there is an inverse relationship between the wage rate and labour demanded, producing a downward-sloping labour demand curve. Therefore, Option A is correct.

❓ Why Other Options Are Incorrect

Option B → Incorrect because it describes the product market, not the labour market.
Option C → Incorrect because it refers to the labour supply curve rather than the labour demand curve.
Option D → Incorrect because MPL and VMPL are production concepts, not the variables shown on the labour demand curve.

🎯 Strategy

Used

Contextual/Tonal Matching

Application:

Identify the variables represented on the axes of the labour demand curve.

Final Logic:

Labour Demand Curve = Wage Rate vs. Quantity of Labour Demanded.

🧠 Memory Trick

Higher Wage → Lower Labour Demand

📚 Class XI – Introductory Microeconomics – Chapter: Market Equilibrium – Topic: Demand Curve for Labour

16 Arrange the logical steps showing precisely why a firm's demand curve for labour is downward sloping:
1. Wage rate w1 increases to a higher w2.
2. VMPL must increase to perfectly maintain the w = VMPL profit-maximizing equality.
3. Because the price of the commodity is constant, MPL must increase.
4. Due to diminishing marginal product, MPL increases only if less labour is employed.

A 1, 3, 2, 4

B 1, 2, 3, 4

C 4, 3, 2, 1

D 2, 1, 4, 3

💡 Short Explanation

Wage rate increases. The firm must satisfy the condition w = VMPL. Since price remains constant, VMPL can increase only through a higher MPL. By the Law of Diminishing Marginal Product, a higher MPL is achieved by employing fewer workers.

✅ Correct Answer Explanation

A perfectly competitive firm maximizes profit where: w = VMPL If the wage rate rises from w₁ to w₂, the firm must move to a point where VMPL is also higher to maintain equilibrium. Since VMPL = P × MPL and the commodity price (P) remains constant under perfect competition, an increase in VMPL requires an increase in MPL. According to the Law of Diminishing Marginal Product, MPL rises only when fewer workers are employed. Thus, the correct sequence is: 1 → Wage rate increases. 2 → VMPL must increase. 3 → MPL must increase. 4 → Employ less labour. Therefore, Option B is correct.

❓ Why Other Options Are Incorrect

Option A → MPL cannot increase before satisfying w = VMPL.
Option C → Reverses the logical sequence.
Option D → Begins from the middle of the adjustment process.

🎯 Strategy

Used

Contextual/Tonal Matching

Application:

Arrange the events in their chronological order.

Final Logic:

Higher Wage → Higher VMPL → Higher MPL → Less Labour

🧠 Memory Trick

Wage ↑ → VMPL ↑ → MPL ↑ → Labour ↓

📚 Class XI – Introductory Microeconomics – Chapter: Market Equilibrium – Topic: Downward-Sloping Labour Demand Curve

17 Match the individual and market supply curve characteristics:

List 1	List 2
1. Low wage rate effect on an individual	a. Upward sloping overall
2. High wage rate effect on an individual	b. Backward bending
3. Shape of individual labour supply curve	c. Individual supplies more labour
4. Shape of market labour supply curve	d. Individual supplies less labour

A 1-a, 2-b, 3-c, 4-d

B 1-b, 2-a, 3-d, 4-c

C 1-d, 2-c, 3-a, 4-b

D 1-c, 2-d, 3-b, 4-a

💡 Short Explanation

At lower wages, individuals tend to supply more labour as wages rise. At very high wages, individuals may prefer more leisure. The individual labour supply curve may bend backward, while the market supply curve remains upward sloping.

✅ Correct Answer Explanation

At low wage rates, the substitution effect dominates, encouraging individuals to work more hours. Therefore: 1 → c (Individual supplies more labour). At high wage rates, the income effect becomes stronger. Individuals can maintain their income while working fewer hours, so: 2 → d (Individual supplies less labour). The individual labour supply curve may therefore become backward bending, giving: 3 → b. However, the market labour supply curve, which aggregates many individuals, is generally upward sloping, giving: 4 → a. Thus, the correct matching is: 1 → c 2 → d 3 → b 4 → a Hence, Option D is correct.

❓ Why Other Options Are Incorrect

Option A → Incorrect because it incorrectly assigns an upward-sloping curve to an individual's labour supply.
Option B → Incorrect because it reverses the effects of low and high wage rates.
Option C → Incorrect because it swaps the shapes of the individual and market labour supply curves.

🎯 Strategy

Used

Option Grouping

Application:

Match each labour supply concept with its corresponding economic outcome before identifying the correct combination.

Final Logic:

Low Wage → More Labour; High Wage → Less Labour; Individual → Backward Bend; Market → Upward Slope.

🧠 Memory Trick

Individual = Backward Bend | Market = Upward

📚 Class XI – Introductory Microeconomics – Chapter: Market Equilibrium – Topic: Labour Supply Curve

18 Which specific effect heavily dominates at extraordinarily high wage rates, causing the individual supply curve to uniquely bend backwards?

A The substitution effect making leisure costlier.

B The technological productivity effect.

C The firm's employment scale effect.

D The income effect (Purchasing power increases significantly, causing a stronger desire for leisure).

💡 Short Explanation

At very high wages, income rises substantially. Individuals can maintain their desired income while working fewer hours. The income effect outweighs the substitution effect, creating a backward-bending labour supply curve.

✅ Correct Answer Explanation

Initially, when wages rise, the substitution effect dominates, encouraging individuals to substitute leisure with work. However, at very high wage rates, individuals earn sufficient income and begin to value additional leisure more than additional earnings. Consequently, the income effect becomes stronger than the substitution effect. As a result, workers reduce the number of hours they supply despite higher wages, causing the individual labour supply curve to bend backward. Therefore, Option D is correct.

❓ Why Other Options Are Incorrect

Option A → Incorrect because the substitution effect explains the upward-sloping portion of the labour supply curve, not the backward bend.
Option B → Incorrect because technological productivity has no direct role in explaining the backward-bending labour supply curve.
Option C → Incorrect because the firm's employment decisions do not determine the individual's labour supply behaviour.

🎯 Strategy

Used

Elimination

Application:

Eliminate options unrelated to the individual's work-leisure decision and identify the effect responsible for the backward bend.

Final Logic:

High Wage → Income Effect Dominates → More Leisure → Backward Bend.

🧠 Memory Trick

High Income → More Leisure

📚 Class XI – Introductory Microeconomics – Chapter: Market Equilibrium – Topic: Backward-Bending Individual Labour Supply Curve

📄 Passage

"As long as the VMPL is greater than the wage rate, the firm will earn more profit by hiring one more unit of labour, and if at any level of labour employment VMPL is less than the wage rate, the firm can increase her profit by reducing a unit of labour employed. Given the assumption of the law of diminishing marginal product, the fact that the firm always produces at w = VMPL implies that the demand curve for labour is downward sloping."

According to the logic presented in the passage, when will a firm exactly maximize its profit without needing to hire more or reduce labour?

A When w < VMPL.

B When w > VMPL.

C Exactly when w = VMPL.

D When VMPL reaches strictly zero.

💡 Short Explanation

Firms hire labour until the additional revenue equals the wage. Profit is maximized when VMPL = w. At this point, there is no incentive to hire or reduce labour.

✅ Correct Answer Explanation

The passage states: If VMPL > w, the firm should hire more labour. If VMPL < w, the firm should reduce labour. Only when VMPL = w does the additional revenue from the last worker exactly equal the wage paid. This is the profit-maximizing equilibrium where no further hiring or firing is required. Hence, Option C is correct.

❓ Why Other Options Are Incorrect

Option A → Incorrect because VMPL exceeds wages, so the firm should hire more labour.
Option B → Incorrect because wages exceed VMPL, so the firm should reduce labour.
Option D → Incorrect because VMPL does not need to become zero for profit maximization.

🎯 Strategy

Used

Substitution

Application:

Use the equilibrium condition given in the passage.

Final Logic:

Profit Maximum ⇒ VMPL = w

🧠 Memory Trick

Equal Means Equilibrium

📚 Class XI – Introductory Microeconomics – Chapter: Market Equilibrium – Topic: Profit-Maximizing Employment Condition

📄 Passage

Based thoroughly on the passage, the downward sloping nature of the firm's labour demand curve is an immediate mathematical implication of:

A The general law of demand for commodities.

B The law of diminishing marginal product combined with the w = VMPL condition.

C Continuously increasing marginal product of capital.

D The naturally upward sloping nature of the market supply curve.

💡 Short Explanation

Firms hire labour where w = VMPL. Diminishing MPL causes VMPL to fall as more labour is employed. This creates a downward-sloping labour demand curve.

✅ Correct Answer Explanation

The passage explains that firms maximize profit by satisfying: w = VMPL Since VMPL = P × MPL and the commodity price remains constant under perfect competition, VMPL falls because of the Law of Diminishing Marginal Product. As wages increase, firms move to points with higher VMPL, which can only be achieved by employing fewer workers. Consequently, the firm's labour demand curve slopes downward. Therefore, Option B is correct.

❓ Why Other Options Are Incorrect

Option A → Incorrect because labour demand is derived from productivity and profit-maximization, not directly from the general law of demand for commodities.
Option C → Incorrect because the marginal product of capital is unrelated to the derivation of the labour demand curve in this context.
Option D → Incorrect because the shape of the market labour supply curve does not determine the firm's labour demand curve.

🎯 Strategy

Used

Contextual/Tonal Matching

Application:

Identify the concepts emphasized in the passage.

Final Logic:

Diminishing MPL + w = VMPL ⇒ Downward-Sloping Labour Demand

🧠 Memory Trick

Diminishing MPL + w=VMPLw = VMPLw=VMPL = Labour Demand ↓

📚 Class XI – Introductory Microeconomics – Chapter: Market Equilibrium – Topic: Derivation of the Labour Demand Curve

CUET UG Booster Economics 5 Test (D3)

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