Microeconomics and Pricing

Pareto Optimality occurs at points where no one can be made better off without making someone worse off. In welfare economics, these points lie on the Contract Curve within the Edgeworth Box, which represents all Pareto efficient allocations.

The theory of oligopoly developed chronologically as: Cournot (1838) - first formal duopoly model; Bertrand (1883) - criticized Cournot, proposed price competition; Stackelberg (1934) - leadership-follower models; Sweezy (1939) - kinked demand curve. Thus the correct order is (iv)-(iii)-(i)-(ii) which corresponds to option B.

Giffen goods are an exception to the law of demand - they have an upward-sloping demand curve. This occurs because the negative income effect (lower real income when price rises) outweighs the positive substitution effect. For Giffen goods, when price falls, the negative income effect dominates, reducing consumption. The reason correctly explains this mechanism.

Correct Answer: 1 - (iii), 2 - (i), 3 - (iv), 4 - (ii)

The correct matching is: Revealed Preference hypothesis - P.A. Samuelson (who developed the theory); Quasi rent - A. Marshall (who introduced the concept); Elasticity of substitution - B.S. Minhas (along with Arrow, Chenery, and Solow in the CES production function); Social welfare function - A. Bergson (who pioneered the concept). This gives the pairing: 1-(iv), 2-(iii), 3-(ii), 4-(i), which is option B.

Indifference curves are convex to the origin due to the diminishing marginal rate of substitution (not diminishing marginal utility). As consumers substitute one good for another, they become less willing to trade more of the first good for the second good, causing the curve to bulge outward. The Reason incorrectly cites 'diminishing marginal utility' but both statements are treated as true in this context.

A non-linear demand curve with constant elasticity must be a rectangular hyperbola of the form P = k/Q^e. Even though elasticity (e) is constant, the slope (dP/dQ = -ek/Q^(e+1)) varies at each point because Q changes. The curve's steepness changes along its length, so the slope is not uniform despite constant elasticity.

In the Sweezy kinked demand curve model of oligopoly, the upper portion of the demand curve is less elastic (more inelastic) because firms expect competitors to match their price increases but not their price decreases. This asymmetry in expected responses creates the kink and makes the upper segment flatter (less elastic).

The LM curve shows money market equilibrium. Interest elasticity of money demand measures how much money demand changes with interest rate. When this elasticity is zero, money demand is completely insensitive to interest rates - people hold money regardless of interest rate (liquidity trap). In this case, only one income level satisfies money market equilibrium at any money supply, making the LM curve vertical (parallel to Y-axis). Monetary policy becomes ineffective.

Limit pricing theory was developed by J.S. Bain to explain how firms set prices to deter entry. E.H. Chamberlin introduced the concept of selling costs in his theory of monopolistic competition. William Baumol proposed the sales maximisation model where firms prioritize revenue over profit. Robin Marris developed the growth maximising model focusing on firm expansion over profit maximization. The correct matching is 1-(iii), 2-(i), 3-(iv), 4-(ii).

Derived demand occurs when the demand for a factor of production (like labour) arises from the demand for the final product it helps produce. A firm hires workers because consumers want the goods and services those workers produce. If demand for the final product decreases, demand for labour to produce it also decreases.

The kinked demand curve model assumes that if an oligopolist raises price, rivals will not follow (to gain market share), but if they lower price, rivals will match it (to prevent losing customers). This creates a 'kink' at the current price - rivals follow price cuts but not price increases, up to a certain point. Option C best captures this asymmetric behavior.

Assertion (A) correctly defines demand as quantity demanded at a specific price during a time period. Reason (R) correctly states that contraction of demand occurs when price increases - this is the law of demand in action, where higher price leads to lower quantity demanded. Both statements are accurate economic principles.

Perfect competition has no control over price (price takers). Monopolistic competition has some control through product differentiation. Oligopoly has practically some control due to interdependence among few firms. Monopoly has usual (full) control over price and output. The matching correctly pairs each market structure with its degree of price control.

Industrial buyers are more homogeneous than consumers because business purchases are driven by technical specifications, economic criteria, and rational requirements. Consumer purchases vary widely due to personal preferences, emotions, and individual needs.