Unit 3 Business Economics PYQ’s 7th Jan 2025

 The correct answer is A, B, C Only.

Key Points

Let’s analyze each option:

• Long run production function
  • The long run production function involves changing all inputs in the production process, meaning all factors of production can be varied. This is consistent with the statement, “When all the factors of production are changed in the same proportion”.
• Law of equal proportion
  • This law states that when inputs are increased in the same proportion, the output will increase in the same proportion. This aligns with the concept of changing all factors of production in the same proportion.
• Law of return to scale
  • The law of return to scale refers to the changes in output when all inputs are varied in the same proportion. This law describes how output responds to a proportional increase in all inputs, which directly relates to the given statement.
• Law of return to a factor
  • This law explains the relationship between input and output when one factor is varied while others are held constant. This is not consistent with the statement, which involves changing all factors in the same proportion.
• Law of Variable proportion
  • This law deals with the output changes when one factor of production is varied while others are held constant, which does not align with the statement about changing all factors in the same proportion.

Therefore, the correct answer is A: Long run production function, B: Law of equal proportion, and C: Law of return to scale. This makes option 1: “A, B, C Only” the correct choice.

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

Key Points

• Adam Smith (A) matches with The Wealth of Nations (III).
  • Explanation: Adam Smith is considered the father of modern economics. His seminal work, “The Wealth of Nations,” laid the foundations for classical economics and introduced important concepts such as the invisible hand and the division of labor.
  • Smith’s ideas on free markets and competition remain influential to this day.
• A. Marshall (B) matches with Principles of Economics (I).
  • Explanation: Alfred Marshall was a key figure in the development of microeconomics. His book, “Principles of Economics,” introduced concepts such as price elasticity of demand and consumer surplus, which are fundamental in economic theory.
  • Marshall’s work helped to formalize economic analysis and bridge classical and neoclassical economics.
• J.R. Hicks (C) matches with Value and Capital (II).
  • Explanation: John Richard Hicks made significant contributions to general equilibrium theory and welfare economics. His book, “Value and Capital,” is a cornerstone in economic theory, addressing issues of value, capital, and interest rates.
  • Hicks’ work laid the groundwork for later developments in economic theory, including the IS-LM model.
• Wassily Leontief (D) matches with Input Output Economics (IV).
  • Explanation: Wassily Leontief developed the input-output model, which analyzes the relationships between different sectors of an economy. His work in “Input Output Economics” provides a method to study the flow of goods and services in an economy and has applications in economic planning and policy.
  • Leontief’s contributions have been used to understand economic structures and the impact of economic changes.

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

Key Points

• Higher Indifference Curve (A) matches with Higher Satisfaction (I).
  • Explanation: A higher indifference curve represents a higher level of satisfaction because it shows combinations of goods that provide a consumer with more utility compared to a lower indifference curve.
• Converse Indifference Curve (B) matches with Diminishing Marginal Rate of Substitution (II).
  • Explanation: The concept of the diminishing marginal rate of substitution is observed along an indifference curve, where as one moves down the curve, the willingness to substitute one good for another decreases.
• Price Line (C) matches with Constant Price Ratio (IV).
  • Explanation: A price line (or budget line) represents the various combinations of two goods that a consumer can afford given their income and the prices of the goods, reflecting a constant price ratio between the two goods.
• Indifference Curve (D) matches with Same satisfaction on the curve (III).
  • Explanation: An indifference curve illustrates all combinations of two goods that provide the consumer with the same level of satisfaction or utility.

The correct answer is – Marginal production is zero

Key Points

• Marginal production is zero
  • Marginal production refers to the additional output produced by adding one more unit of input.
  • Total production is maximized when marginal production is zero because adding more inputs does not increase total production beyond this point.
  • This occurs at the peak of the total production curve, where any further addition of inputs will either maintain or decrease total production.

Additional Information

• Average production
  • Average production is the total production divided by the number of units of input used.
  • It is a measure of productivity per unit of input but does not directly indicate the point of maximum total production.
• Marginal production
  • When marginal production is maximum, it indicates the point where the addition of one more unit of input increases total production at the highest rate.
  • This is an important phase in production but does not signify the maximum total production.
• Average production is zero
  • If average production is zero, it means no output is being produced, which is not relevant for determining maximum total production.

The correct answer is – A.F.C Curve

Key Points

• A.F.C Curve
  • A.F.C stands for Average Fixed Cost.
  • The Average Fixed Cost (A.F.C) curve is not U-shaped; instead, it continuously declines as the output increases.
  • This decline happens because fixed costs remain constant regardless of output level, so when output increases, the fixed cost per unit decreases.

Additional Information

• A.V.C Curve
  • A.V.C stands for Average Variable Cost.
  • The Average Variable Cost (A.V.C) curve is typically U-shaped due to the law of diminishing marginal returns.
  • Initially, as production increases, A.V.C decreases, reaches a minimum point, and then starts increasing.
• A.C. Curve
  • A.C stands for Average Cost.
  • The Average Cost (A.C) curve is also U-shaped, reflecting both fixed and variable costs.
  • Initially, the A.C decreases due to spreading fixed costs over more units, but after a certain point, it increases due to rising variable costs.
• M.C. Curve
  • M.C stands for Marginal Cost.
  • The Marginal Cost (M.C) curve is typically U-shaped due to the law of diminishing returns.
  • Initially, M.C decreases, reaches a minimum point, and then starts increasing as additional units of output are produced.

The correct answer is – Rise

Key Points

• When price of a good X rises
  • If the price of good X increases, consumers will look for alternative products that serve similar needs or purposes.
  • Good Y is considered a substitute for good X, meaning it can replace good X in consumption.
  • As the price of good X rises, consumers will shift their demand from good X to good Y to save money.
  • This shift in demand leads to an increase in the demand for substitute good Y.

Additional Information

• Other Options
  • Fall
    • Incorrect because if the price of good X rises, consumers are less likely to buy good X and more likely to buy its substitute, good Y.
  • Remain unchanged
    • Incorrect because the law of demand states that a rise in the price of a good typically leads to a decrease in its quantity demanded and an increase in the demand for its substitute.
  • Falls initially and then rises
    • Incorrect because the demand for the substitute good Y will generally increase as soon as the price of good X rises, without any initial fall.

 The correct answer is – The market is highly price sensitive

Key Points

• The market is highly price sensitive
  • Marketing skimming involves setting a high initial price for a product, which is gradually lowered over time.
  • This strategy is used when the market is not highly price sensitive, allowing the company to maximize profits from early adopters willing to pay a premium.
  • In a highly price-sensitive market, consumers would be less likely to purchase the product at a high initial price, making this strategy ineffective.

Additional Information

• A sufficient number of buyers signal a high demand
  • This condition supports marketing skimming as there are enough customers willing to pay the high initial price.
  • High demand at the initial stages ensures that the company can recover its costs and make substantial profits before lowering the price.
• The high initial price does not attract more competitors to the market
  • In marketing skimming, the high initial price should not attract new competitors, allowing the company to maintain a competitive edge.
  • Fewer competitors mean the company can maximize its profits for a longer period before prices are driven down by market competition.
• The high price communicates the image of a superior product
  • A high initial price can create a perception of higher quality or exclusivity, attracting status-conscious customers.
  • This perception helps justify the premium price and can establish a strong brand image in the market.

The correct answer is – A firm under oligopoly is in equilibrium where MR = MC

Key Points

• A firm under oligopoly is in equilibrium where MR = MC
  • Oligopoly is a market structure characterized by a small number of firms that dominate the market.
  • In oligopoly, firms are interdependent, meaning the actions of one firm can influence the actions of others.
  • The equilibrium condition for an oligopoly is where marginal revenue (MR) equals marginal cost (MC).
  • This is because firms in oligopoly maximize their profits by producing at the level of output where MR equals MC.

Additional Information

• Perfect Competition
  • A firm under perfect competition is in equilibrium where marginal cost (MC) equals marginal revenue (MR) and also equals average revenue (AR).
  • Since price equals AR in perfect competition, the condition MC = MR = AR holds true.
• Monopoly
  • A firm under monopoly is in equilibrium where marginal revenue (MR) equals marginal cost (MC).
  • Unlike perfect competition, a monopolist can influence market prices and thus, MR does not equal AR.
• Monopolistic Competition
  • A firm under monopolistic competition is in equilibrium where marginal cost (MC) equals marginal revenue (MR).
  • In the long run, a firm in monopolistic competition produces at a level where price equals average cost (AC), but not at the point where AC equals MC.

The correct answer is B, D, E Only.

Key Points

Let’s analyze each factor:

• One seller and large number of buyers
  • This assumption pertains to a monopoly market structure, where a single seller dominates the market.
  • Reason for exclusion: Oligopoly involves a few sellers, not just one.
• A few sellers and large number of buyers
  • This is a key characteristic of an oligopoly, where the market is dominated by a small number of firms.
  • Reason for inclusion: This fits the definition of an oligopoly.
• Large number of sellers and large number of buyers
  • This describes a perfect competition market structure, where numerous sellers and buyers exist.
  • Reason for exclusion: Oligopoly involves few sellers, not many.
• Entry of new seller is restricted
  • In oligopolistic markets, barriers to entry are high, preventing many new firms from entering the market.
  • Reason for inclusion: This is a common characteristic of oligopolies.
• Firms Interdependence
  • Oligopolistic firms are highly interdependent, with each firm’s actions affecting the others.
  • Reason for inclusion: This interdependence is a defining feature of oligopoly markets.

Therefore, the assumptions that fit strictly as characteristics of oligopoly markets are B: A few sellers and large number of buyers, D: Entry of new seller is restricted, and E: Firms Interdependence. This makes option 4: “B, D, E Only” the correct choice.