Economics 2021 Paper I 50 marks Explain

Q2

(a) Explain the differences between Cournot model of duopoly with similar product and differentiated product. (15 marks) (b) What type of conjecture is involved in the existence of kinked demand curve ? Do you think that kinked demand curve model is a price determination model in an oligopoly market ? Justify your answer. (5+10 marks) (c) Examine how profit, wage and rent in Ricardian system move differently with the movements in level of income. (20 marks)

हिंदी में प्रश्न पढ़ें

(a) कुर्नों के सजातीय उत्पाद द्वयाधिकार मॉडल तथा विभेदीकृत-उत्पाद द्वयाधिकार मॉडल की भिन्नताओं की व्याख्या कीजिए । (15 अंक) (b) व्याकुंचित मांग वक्र में किस प्रकार का अनुमान शामिल है ? आपके अनुसार क्या व्याकुंचित मांग वक्र मॉडल अल्पाधिकार बाजार में एक कीमत-निर्धारण का मॉडल है ? अपने उत्तर को उचित सिद्ध कीजिए । (5+10 अंक) (c) परीक्षण कीजिए कि रिकार्डों की व्यवस्था में लाभ, मजदूरी एवं लगान, आय के स्तर की गतिशीलता के साथ किस प्रकार भिन्न भिन्न तरह से गतिशील होते हैं । (20 अंक)

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Directive word: Explain

This question asks you to explain. The directive word signals the depth of analysis expected, the structure of your answer, and the weight of evidence you must bring.

See our UPSC directive words guide for a full breakdown of how to respond to each command word.

How this answer will be evaluated

Approach

Begin with a brief introduction distinguishing oligopoly models from classical distribution theory. For part (a), spend ~30% time explaining Cournot with homogeneous versus differentiated products, contrasting reaction functions and equilibrium outcomes. For part (b), allocate ~20% time addressing the 'followership' conjecture and critically evaluating whether kinked demand actually determines price or merely explains price rigidity. For part (c), devote ~50% time examining Ricardian distribution using the marginal principle, showing how rising cultivation costs squeeze profits while rent rises and wages stagnate at subsistence. Conclude by noting the classical synthesis of value and distribution.

Key points expected

  • Part (a): Cournot homogeneous product yields single market price with identical reaction functions; differentiated product permits price-setting with distinct demand curves and asymmetric equilibrium
  • Part (a): Mathematical derivation showing homogeneous case leads to price between monopoly and perfect competition; differentiated case allows price dispersion based on cross-elasticities
  • Part (b): 'Followership' or 'matching' conjecture—rivals match price cuts but ignore price rises—creates the kink at current price
  • Part (b): Critical evaluation that kinked demand explains price stickiness/rigidity rather than price determination; equilibrium price remains indeterminate without additional assumptions
  • Part (c): Ricardian inverse relationship between profit and rent as cultivation extends to inferior lands; rent rises with extensive and intensive margins
  • Part (c): Wages fixed at natural/subsistence level by Malthusian mechanism; profits as residual shrink with rising corn prices and capital accumulation
  • Part (c): Mathematical illustration using Ricardian numerical examples showing distributional shares at different levels of income/capital accumulation
  • Synthesis: Classical distribution theory as a theory of growth and stagnation versus modern oligopoly theory of market behaviour

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Concept correctness25%12.5Precisely distinguishes Cournot quantity-setting from Bertrand price-setting; correctly identifies 'followership' conjecture in (b); accurately captures Ricardian marginal land principle, falling rate of profit, and subsistence wage determination; no conflation of classical and neoclassical frameworksBasic understanding of Cournot equilibrium and kinked demand intuition; some grasp of Ricardian rent but confuses profit determination or treats wages as flexible; minor theoretical inaccuraciesConfuses Cournot with Bertrand or Stackelberg; misidentifies conjecture as 'collusion'; fundamental misunderstanding of Ricardian distribution—treating all three shares as symmetrically determined or ignoring the residual nature of profit
Diagram / model20%10For (a): separate reaction function diagrams showing 45° line intersection for homogeneous versus asymmetric for differentiated; for (b): correctly drawn kinked demand with discontinuous MR; for (c): Ricardian extensive margin diagram showing grades of land or intensive margin with diminishing returnsBasic Cournot duopoly diagram present; kinked demand curve drawn but MR omitted or incorrectly continuous; some attempt at land quality diagram but labels unclear or axes confusedMissing diagrams or irrelevant supply-demand curves; kink drawn without explanation of conjectural basis; no visual representation of Ricardian system; diagrams contradict verbal explanation
Quantitative reasoning20%10Derives Cournot equilibrium quantities (a/3b for homogeneous case); shows mathematical conditions for differentiated product equilibrium; explicitly works through Ricardian numerical example showing profit rate decline as marginal land shifts; calculates distributional shares at different income levelsMentions reaction functions algebraically without full derivation; states Ricardian results qualitatively; some numerical illustration but with calculation errors or incomplete workingNo mathematical treatment; purely verbal exposition; incorrect formulas or nonsensical calculations; quantitative claims unsupported by any working
Indian / empirical examples15%7.5For oligopoly: Indian examples like telecom duopoly (Jio-Airtel) or aviation (Indigo-SpiceJet) showing Cournot-like quantity competition; FMCG price rigidity; for Ricardian: Indian agricultural land quality gradients, Green Revolution intensive margin, or tenancy reforms affecting rent-profit distributionGeneric developed country examples or outdated Indian cases; superficial mention of Indian agriculture without connecting to Ricardian mechanism; no specific empirical illustration for oligopoly sectionsNo Indian examples; irrelevant or factually incorrect illustrations; examples that contradict the theoretical model being explained
Policy implication20%10For oligopoly: competition policy implications of Cournot versus differentiated equilibrium—merger analysis, collusion detection; for kinked demand: macroeconomic implications of price rigidity; for Ricardian: land taxation (Henry George argument), free trade in corn (repeal of Corn Laws parallel), contemporary relevance for resource extraction and stagnant wage debatesBrief mention of antitrust or agricultural policy without depth; standard welfare triangle analysis without contemporary relevance; disconnected policy points per sectionNo policy discussion; or irrelevant policy prescriptions that misunderstand the models; anachronistic application of modern policy to classical framework without justification

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