Unit 3 Business Economics PYQ’s 9 Sep 2026 Shift 2

The Correct answer is: A, C, and E only

Key Points

• Measurability of Utility (Statement A):
  • This statement is correct.
  • The Cardinal Utility Theory, championed by economists like Alfred Marshall, assumes that utility is a quantifiable and measurable entity.
  • It suggests that utility can be expressed in absolute units called utils, allowing for direct comparison and addition of satisfaction levels.
• Non-measurability of Utility (Statement B):
  • This statement is incorrect.
  • Non-measurability is a core tenet of Ordinal Utility Theory (Hicks and Allen), which argues that utility can only be ranked or ordered, not measured in absolute numbers.
• Diminishing Marginal Utility (Statement C):
  • This statement is correct.
  • The theory is based on the Law of Diminishing Marginal Utility, which states that as a consumer consumes more units of a commodity, the additional satisfaction (marginal utility) derived from each successive unit decreases.
• Consistency and Transitivity (Statement D):
  • This statement is incorrect in the specific context of the primary assumptions of Cardinal Utility.
  • While rationality is assumed, consistency and transitivity are formal axioms more strictly associated with Ordinal Utility Theory and Revealed Preference Theory to define consumer behavior without numerical measurement.
• Constant Marginal Utility of Money (Statement E):
  • This statement is correct.
  • Marshall assumed that the marginal utility of money remains constant for the consumer. This serves as a ‘measuring rod’ to convert the utility of goods into monetary terms.

Additional Information

• Independent Utility:
  • The Cardinal approach assumes that the utility derived from a commodity is a function of the quantity of that commodity alone and is not affected by the consumption of other goods.
• Introspection:
  • The theory relies on the method of introspection (self-observation) to understand how a consumer’s mind reacts to changes in the quantity of goods consumed.
• Equi-Marginal Utility:
  • A consumer reaches equilibrium when the ratio of marginal utility to price is equal across all goods: (MU_x/P_x = MU_y/P_y = MU_m).

The correct answer is: A-II, B-III, C-I, D-IV.

Key Points

Additional Information

• Normal Goods:
  • For these goods, the Law of Demand holds true. When the price of a normal good falls, the quantity demanded increases, and vice versa. This inverse relationship results in a Negative Price Effect.
  • The income effect for normal goods is positive, meaning demand increases as consumer income rises.
• Giffen Goods:
  • These are a special category of inferior goods that violate the Law of Demand. For Giffen goods, as the price increases, the demand also increases because the negative income effect outweighs the substitution effect.
  • This results in a Positive Price Effect and an upward-sloping demand curve.
• Inferior Goods:
  • An inferior good is one for which demand decreases as the consumer’s income increases. This inverse relationship between income and demand is known as a Negative Income Effect.
  • Consumers switch to superior or normal goods as their purchasing power improves.
• Necessity Goods:
  • Necessities are goods that consumers buy regardless of changes in their income or price levels (to a certain extent).
  • In certain theoretical models or specific price ranges, the Price Effect is Zero (or near zero) because the quantity demanded remains constant as these items are essential for survival (e.g., life-saving medicines).

The correct answer is ‘4L and 4K produce 1000Q’

In economics, Returns to Scale refers to the change in output resulting from a proportionate change in all inputs (factors of production). It is a long-run concept where all factors, such as Labor (L) and Capital (K), are variable.

Key Points

• Increasing Returns to Scale (IRS):
  • IRS occurs when the percentage increase in output is greater than the percentage increase in inputs.
  • If inputs are increased by ‘n’ times, the output increases by more than ‘n’ times.
• Analysis of the Given Scenario:
  • Initial State: 1L + 1K → 200Q.
  • Input Increase in Option 4: Inputs (L and K) are increased from 1 unit to 4 units. This is a 4-fold increase (400%).
  • Output Change in Option 4: Output (Q) increases from 200 to 1000.
  • Calculation: A 4-fold increase in output would be 200 × 4 = 800Q. Since 1000Q is greater than 800Q, the output has increased more than proportionately (5-fold increase).
  • Therefore, 4L and 4K producing 1000Q represents Increasing Returns to Scale.

Additional Information

• Option 3 Analysis: 3L and 3K produce 500Q. Here, inputs increased 3 times, but output increased only 2.5 times (200 × 2.5 = 500). This represents Decreasing Returns to Scale.
• Causes of IRS: IRS usually occurs due to economies of scale, such as specialized machinery, division of labor, and better utilization of fixed managerial resources as the scale of production expands.

The Correct answer is: B, C and E only

Key Points

• Monopoly Firm as a Price Maker (Statement B):
  • This statement is correct.
  • A monopolist is the sole seller in the market with no close substitutes. Because it faces the entire market demand curve, it has significant market power to set the price of its product.
  • Unlike perfect competition where firms are price takers, a monopoly firm is a price maker.
• Decision on Price or Quantity (Statement C):
  • This statement is correct.
  • A monopolist can choose to set either the price or the quantity it wishes to sell, but it cannot set both independently.
  • Once the price is set, the market demand determines the quantity; conversely, if the firm decides on a quantity, the demand curve determines the maximum price it can charge.
• Production with Increasing Average Cost (Statement E):
  • This statement is correct.
  • The equilibrium for a monopolist occurs where Marginal Revenue (MR) = Marginal Cost (MC).
  • This equilibrium point can occur at a level of output where the Average Cost (AC) curve is falling, at its minimum, or even where it is increasing, provided that the price (AR) is greater than or equal to the Average Variable Cost (AVC) in the short run.
• Price Taker vs. Price Maker (Statement A):
  • This statement is incorrect.
  • A price taker is a characteristic of Perfect Competition, where individual firms are too small to influence market price. A monopolist, by definition, influences price.
• Constant Marginal Cost Curve (Statement D):
  • This statement is incorrect.
  • While a monopolist could have a constant marginal cost in specific theoretical cases, it is not a general rule or a defining characteristic of monopoly.
  • Typically, marginal cost curves are U-shaped due to the law of diminishing marginal returns.

Additional Information

• Demand Curve:
  • The monopolist faces a downward-sloping demand curve (Average Revenue curve). This implies that to sell more units, the firm must lower its price.
• Profit Maximization:
  • A monopolist maximizes profit by producing the output level where MR = MC and charging a price based on the demand curve at that output level.
  • Because the price is usually higher than the marginal cost (P > MC), monopoly leads to allocative inefficiency and deadweight loss.

The correct answer is ‘E = ∞‘

Key Points

• Perfectly Elastic Demand:
  • A perfectly elastic demand occurs when a very small change in price leads to an infinite change in the quantity demanded.
  • In this situation, consumers are willing to buy all they can at a specific price, but if the price increases even slightly, the demand drops to zero.
  • The demand curve in this case is a horizontal straight line parallel to the X-axis (Quantity axis).
• Mathematical Representation:
  • The Price Elasticity of Demand (E_p) is calculated as the percentage change in quantity demanded divided by the percentage change in price.
  • Formula: E_p = (ΔQ / Q) / (ΔP / P).
  • Since the change in price (ΔP) is effectively zero for any change in quantity, the denominator becomes zero, making the elasticity infinite (∞).

Additional Information

• Perfectly Inelastic Demand (E = 0): Quantity demanded does not change at all regardless of the change in price (e.g., life-saving drugs).
• Unitary Elastic Demand (E = 1): The percentage change in quantity demanded is exactly equal to the percentage change in price.
• Relative Elasticity: E > 1 indicates that demand is highly responsive to price changes, while E < 1 indicates demand is less responsive.

The correct answer is: A-II, B-I, C-IV, D-III.

Key Points

Additional Information

• Oligopoly:
  • This market structure is dominated by a small number of large firms.
  • There is a high degree of interdependence between firms; the actions of one firm (like price changes) significantly affect others.
  • Examples include the automobile industry and telecommunications.
• Perfect Competition:
  • Characterized by a very large number of buyers and sellers.
  • Firms sell homogeneous (identical) products, and no single firm has the power to influence the market price (firms are price takers).
  • There is perfect knowledge and free entry/exit in the market.
• Monopoly:
  • A market situation where there is only one single seller of a product with no close substitutes.
  • The seller has full control over the price (price maker) and there are strong barriers to entry for new firms.
  • Public utilities like railways often exhibit monopoly characteristics.
• Monopolistic Competition:
  • Features many sellers selling differentiated products that are close but not perfect substitutes.
  • Product differentiation is achieved through branding, quality, or minor functional differences.
  • Examples include the soap, shampoo, and clothing industries.

The correct answer is ‘Price lining’

Key Points

• Price Lining:
  • Price lining is a marketing process wherein products or services within a specific group are set at different price points. The higher the price, the higher the perceived quality of the product.
  • In this practice, a firm first identifies a price target based on consumer demand and competition. It then works backward to develop a product with features and costs that allow the firm to maximize total profit at that specific price point.
  • It simplifies the consumer decision-making process by grouping products into distinct price categories (e.g., budget, standard, and premium), rather than having a wide range of individual prices.
  • This strategy is commonly used in the apparel and retail industries, where a store might sell all ties at three price points: $25, $50, and $75.

Additional Information

• Peak Load Pricing:
  • This is a form of price discrimination where a higher price is charged during periods of high demand (peak periods) and a lower price during periods of low demand (off-peak).
  • It is frequently used by utility companies (electricity) and transportation services (airlines, trains) to manage capacity and shift consumption to off-peak hours.
• Tying Pricing:
  • Also known as product tying, this occurs when a seller conditions the sale of one product (the tying product) on the customer’s agreement to purchase a second product (the tied product).
  • An example is a printer manufacturer requiring customers to buy their specific brand of ink cartridges to ensure the printer functions.
• Two-part Pricing:
  • This is a pricing strategy where consumers are charged both a fixed fee (entry fee) and a per-unit usage fee.
  • Common examples include gym memberships (initiation fee + monthly fee) or amusement parks (entrance ticket + individual ride tickets).

The correct answer is ‘Slope of marginal cost curve is more than the slope of marginal revenue curve’

Key Points

• Market Equilibrium (Producer’s Equilibrium): In microeconomics, a firm reaches equilibrium when it maximizes its total profits. This state is achieved when two specific conditions regarding Marginal Revenue (MR) and Marginal Cost (MC) are met.
• First Condition (Necessary Condition): The first condition for equilibrium is that Marginal Revenue must equal Marginal Cost (MR = MC). At this point, the cost of producing one additional unit is exactly equal to the revenue generated from selling that unit.
• Second Condition (Sufficient Condition): The second condition, which is the focus of this question, is that the Marginal Cost (MC) curve must cut the Marginal Revenue (MR) curve from below.
  • Mathematically, this means that at the point of equilibrium, the slope of the MC curve must be greater than the slope of the MR curve.
  • If the MC curve cuts the MR curve from above, the firm could still increase its profit by producing more units, as the cost of additional units would be falling relative to revenue.
  • Therefore, for stable equilibrium, the MC must be rising (or falling less rapidly than MR) at the point of intersection.

Additional Information

• Slope of MC < Slope of MR: This condition implies that the MC curve is flatter than the MR curve or is cutting it from above. In such a scenario, increasing production would lead to higher profits because the additional cost is decreasing faster than the additional revenue, meaning the firm has not yet reached its profit-maximizing output.
• Slope of MR ≥ Slope of MC: This is generally the opposite of the equilibrium condition. If the slope of MR is greater, it implies that for every additional unit, revenue is increasing faster than cost, prompting the firm to expand production further rather than stay at equilibrium.
• MC Curve and AC Curve: The relationship where the MC curve equals the Average Cost (AC) curve occurs at the minimum point of the AC curve. While this is important for long-run equilibrium in perfect competition (optimum plant size), it is not the primary condition for general market equilibrium (profit maximization).
• Perfect Competition vs. Monopoly: In Perfect Competition, the MR curve is horizontal (slope = 0), so the equilibrium condition simplifies to the MC curve having a positive slope (rising). In a Monopoly, the MR curve is downward sloping, but the MC curve must still be steeper (less negative or more positive) than the MR curve to satisfy the equilibrium condition.