Economics 2021 Paper I 50 marks Explain

Q3

(a) Show that differences in underlying expectation lead to differences in Keynesian and classical aggregate supply curve. (15 marks) (b) Apply the theory of liquidity preference to explain why an increase in money supply lowers the interest rate. What does this explanation assume about the price level ? (15 marks) (c) Explain how the weaknesses of Keynesian speculative demand for money have been identified in Regressive Expectations model. (20 marks)

हिंदी में प्रश्न पढ़ें

(a) दर्शाइए कि निहित प्रत्याशा (अन्डरलाइंग एक्सपेक्टेशन) में भेद, कीन्सियन एवं क्लासिकल समग्र पूर्तिवक्र में भेद उत्पन्न करते हैं । (15 अंक) (b) तरलता-पसन्दगी सिद्धान्त का प्रयोग करते हुए व्याख्या कीजिए कि मुद्रा-पूर्ति में वृद्धि ब्याज-दर को क्यों कम कर देती है । इस व्याख्या में कीमत-स्तर के प्रति क्या धारणा बनायी गयी है ? (15 अंक) (c) कीन्स की मुद्रा की अपेक्षी मांग की कमियाँ प्रतिगामी प्रत्याशा मॉडल में किस प्रकार चिह्नित की गई है, व्याख्या कीजिए । (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

The directive 'explain' demands clear exposition of mechanisms with logical reasoning. Structure: brief intro on Keynesian vs. classical divide; for (a) ~30% time on expectation formation and AS curve derivation; for (b) ~30% on liquidity preference mechanism and price level assumption; for (c) ~40% on regressive expectations critique with mathematical intuition; conclude on evolution of macroeconomic thought.

Key points expected

  • (a) Classical AS is vertical due to rational expectations and market clearing; Keynesian AS is upward sloping/horizontal due to adaptive expectations and nominal rigidities
  • (a) Role of expected price level (P^e) in wage-setting: classical P^e = P always, Keynesian P^e adjusts slowly
  • (b) Liquidity preference theory: Ms↑ → excess money supply → bond purchases → bond prices↑ → interest rate↓
  • (b) Keynesian assumption: price level is fixed/constant in the short run (liquidity trap possibility)
  • (c) Keynes' speculative demand: all-or-nothing between money and bonds based on interest rate expectations
  • (c) Regressive expectations model (Tobin, Baumol): adaptive expectations where expected return regresses to normal level
  • (c) Weakness identified: Keynes' discrete shift vs. continuous portfolio adjustment; interest elasticity varies with regressive expectations

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Concept correctness25%12.5Precisely distinguishes adaptive vs. rational expectations for (a); correctly identifies fixed price assumption for (b); accurately captures Tobin's critique of Keynes' binary speculative demand for (c) with proper terminologyBasic understanding of AS differences but conflates expectation types; vague on price level assumption; mentions regressive expectations without clear critique linkageConfuses classical and Keynesian AS slopes; misstates liquidity preference mechanism; omits or misrepresents regressive expectations critique
Diagram / model20%10Draws vertical classical AS and upward-sloping/horizontal Keynesian AS with expectation annotations; clear money market (L-M) diagram for (b); portfolio choice diagram or return regression line for (c)Basic AS diagrams without expectation labels; standard L-M diagram; vague or missing diagram for regressive expectationsIncorrect or missing diagrams; diagrams present but mislabeled or irrelevant to expectation mechanisms
Quantitative reasoning15%7.5Shows AS derivation: Y = Y(P/P^e) with elasticity conditions; derives di/dMs < 0 for (b); presents regressive expectation formula: r^e = θr̄ + (1-θ)r₋₁ with sensitivity analysisMentions functional forms without derivation; qualitative treatment of money-interest relationship; states regressive formula without interpretationNo mathematical treatment; purely verbal exposition where quantitative rigor is expected
Indian / empirical examples20%10Cites India's 2008-09 stimulus (Keynesian expectations) vs. 1991 reforms (classical adjustment); references RBI's liquidity management and interest rate transmission; mentions Indian money market segmentation affecting speculative demandGeneric mention of fiscal/monetary policy without specific Indian context; no empirical validation of expectation formationNo Indian examples; uses only developed economy illustrations or none at all
Policy implication20%10Links expectation differences to policy ineffectiveness proposition vs. activist stabilization; connects liquidity preference to RBI's rate channel effectiveness; draws lessons for inflation targeting and forward guidance in IndiaStandard policy conclusions without integration across parts; generic statements on monetary/fiscal policyNo policy implications or irrelevant policy discussion disconnected from theoretical analysis

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