UPSC Mains 2020 Economics Optional Question Papers with Model Answers

All 56 questions of the 2020 Civil Services Main Examination, Economics Paper I and Economics Paper II, with marks and a suggested time per part. Solve each part on paper first, then open the model answer, or send it to answer-writing practice for evaluation.

UPSC Mains 2020 Economics Paper I

Question 1 (50 marks)

Q1(a) · Theories of Employment, Income and Interest · 10 marks≈ 7 min
IS-LM Model and the Neo-classical Synthesis
Explain how equilibrium rate of interest and income are determined with the interaction of both product and money market.
हिंदी में प्रश्न
व्याख्या कीजिए कि उत्पाद एवं मुद्रा बाज़ार दोनों की अन्तर्क्रिया से आय तथा ब्याज की सन्तुलन दर कैसे निर्धारित होती हैं।
Practise this question Theories of Employment, Income and Interest notes
Model answer
Paper and question: Paper I, Q1(a)
Approach: Define IS and LM with their equations, show the intersection as simultaneous equilibrium, and explain the adjustment towards it with a diagram.
The IS-LM model, formulated by Hicks ('Mr. Keynes and the Classics', 1937) and developed by Hansen, shows how income and the interest rate are determined simultaneously by the product and money markets.
Product market (IS): equilibrium requires planned investment to equal saving, I(r) = S(Y). Since investment falls as r rises, higher income (more saving) must be matched by a lower interest rate: the IS curve slopes downward.
Money market (LM): equilibrium requires the real money supply M/P to equal money demand L = kY − hr. A higher income raises transactions demand, so with a fixed money supply the interest rate must rise to reduce speculative demand: the LM curve slopes upward.
Equilibrium: only at the intersection E (Y*, r*) are both markets in equilibrium. Off E, output responds to excess demand or supply in goods and the interest rate to excess demand or supply of money, so the economy moves to E.
Diagram: r on the vertical and Y on the horizontal axis; downward IS and upward LM crossing at E (Y*, r*); arrows from the four regions converge to E.
Shifts in IS (fiscal policy, investment confidence) or LM (money supply) change both Y and r.
Q1(b) · Money and Monetary Management · 10 marks≈ 7 min
Supply of Money and the Money Multiplier
Distinguish between post-Keynesian approaches to horizontalist and structuralist theory of endogenous money supply.
हिंदी में प्रश्न
अन्तर्जात मुद्रा आपूर्ति के अनुप्रास्थिक एवं संरचनात्मक सिद्धान्त के उत्तर-कीन्सवादी उपागमों में प्रभेद कीजिए।
Practise this question Money and Monetary Management notes
Model answer
Paper and question: Paper I, Q1(b)
Approach: Explain the shared post-Keynesian idea that loans create deposits, then distinguish horizontalists (Kaldor, Moore: full accommodation, flat money supply at the policy rate) from structuralists (Pollin, Palley, Minsky: partial accommodation and liability management, upward-sloping supply).
Post-Keynesians hold that money supply is endogenous: banks make loans in response to demand for credit, and loans create deposits; reserves follow rather than precede lending.
Horizontalists (Nicholas Kaldor, The Scourge of Monetarism, 1982; Basil Moore, Horizontalists and Verticalists, 1988): the central bank sets the short-term interest rate and must supply whatever reserves banks need at that rate to protect the payments system. Credit money supply is therefore perfectly elastic, a horizontal line at the policy rate plus a mark-up; the quantity of money is determined by demand.
Structuralists (Robert Pollin, 1991; Thomas Palley; drawing on Minsky): the central bank accommodates only partly; banks meet loan demand by liability management (raising non-reservable funds, selling securities), which becomes costlier as lending expands, and banks' own liquidity preference and rising borrower risk push rates up. The money supply curve therefore slopes upward.
Diagram: interest rate against money: a horizontal supply at the policy rate (horizontalist) and an upward-sloping supply (structuralist), each meeting a credit-demand curve.
RBI's practice of targeting the repo rate and supplying liquidity through its liquidity adjustment facility is closer to the horizontalist description, though liquidity conditions still affect market rates.
Q1(c) · Economic Development · 10 marks≈ 7 min
Development and Environmental Sustainability
Explain how renewable resources will play a role in future economics.
हिंदी में प्रश्न
नवीकरणीय संसाधन भविष्य के अर्थशास्त्र में एक भूमिका कैसे अदा करेंगे, व्याख्या कीजिए।
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q1(c)
Approach: Explain why renewable resources will be central to future economies (exhaustion of non-renewables, climate constraint, falling costs, new industries, circular bioeconomy) and the conditions for sustainable use.
Renewable resources, such as solar and wind energy, forests, fisheries, water and soils, regenerate naturally, whereas fossil fuels and minerals are finite stocks whose depletion and emissions limit long-run growth.
Their role in future economics: (i) energy transition: the climate constraint and net-zero targets make renewable energy the backbone of future power systems, and solar and wind costs have fallen steeply over the past decade; (ii) new industries and jobs in solar manufacturing, batteries, green hydrogen and the bioeconomy; (iii) energy security for importers like India; (iv) a circular economy that replaces extraction with reuse; (v) sustainability accounting, where renewable natural capital counts as wealth.
But renewables must be used within regeneration limits; over-harvesting forests, fish and groundwater turns them into depletable stocks.
Pricing, property rights and community management (Ostrom) are therefore essential.
Q1(d) · Money and Monetary Management · 10 marks≈ 7 min
Supply of Money and the Money Multiplier
Mention the classification of assets held by a commercial bank. Discuss the problems faced by commercial bank due to rise in NPAs.
हिंदी में प्रश्न
एक वाणिज्यिक बैंक द्वारा धारित परिसम्पत्तियों के वर्गीकरण का उल्लेख कीजिए। ग़ैर-निष्पादित परिसम्पत्तियों में वृद्धिवश वाणिज्यिक बैंक के सामने आने वाली समस्याओं की विवेचना कीजिए।
Practise this question Money and Monetary Management notes
Model answer
Paper and question: Paper I, Q1(d)
Approach: Give RBI's asset classification (standard and non-performing: sub-standard, doubtful, loss; 90-day rule), then the problems that rising NPAs cause for banks and the economy, with data and remedies.
Classification (RBI norms): a loan is a non-performing asset when interest or principal is overdue for more than 90 days. Assets are standard, sub-standard (NPA up to 12 months), doubtful (sub-standard over 12 months) or loss (uncollectible), with provisioning rising to 100 per cent.
Problems from rising NPAs: (i) profitability falls as interest income stops and provisions rise; (ii) capital erosion weakens capital adequacy under Basel III, needing recapitalisation (public sector banks received over ₹3 lakh crore between 2016–17 and 2020–21); (iii) credit crunch: banks become risk-averse and cut lending, especially to industry and MSMEs;
(iv) weak transmission of monetary policy; (v) higher lending rates for good borrowers; (vi) the 'twin balance sheet' problem of stressed banks and over-leveraged firms (Economic Survey 2016–17) slows investment.
Indian experience: the gross NPA ratio of scheduled commercial banks peaked at about 11.2 per cent in March 2018 and fell to about 2.3 per cent by March 2025 (RBI Financial Stability Report), helped by the IBC (2016) and recapitalisation.
Q1(e) · Economic Development · 10 marks≈ 7 min
Myrdal, Kuznets and Structural Change; Role of Agriculture
Explain Myrdal's cumulative causation theory as the theory for development.
हिंदी में प्रश्न
विकास सिद्धान्त के रूप में मिर्डाल के संचयी कार्योत्पादन सिद्धान्त की व्याख्या कीजिए।
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q1(e)
Approach: Explain Myrdal's circular cumulative causation with backwash and spread effects, its international application and policy conclusion.
Gunnar Myrdal (Economic Theory and Underdeveloped Regions, 1957) rejected the idea of stable equilibrium. In his theory of circular cumulative causation, a change in one factor causes changes in others that reinforce the original change, so processes are cumulative.
If a region gains an initial advantage, it attracts capital, skilled labour and enterprise from other regions; its markets, infrastructure and incomes grow, attracting still more. These backwash effects drain lagging regions. Spread effects, such as rising demand for the products of the hinterland and diffusion of technology, work the other way, but in poor countries they are weak, so inequality widens.
The same applies internationally: free trade and capital flows tend to benefit rich countries and leave poor ones specialised in primary goods.
Myrdal therefore saw development as requiring active state intervention, planning, land reform and regional policy to strengthen spread effects. The theory influenced India's backward-area programmes and remains relevant to regional disparities.

Question 2 (50 marks)

Q2(a) · Market Structures · 15 marks≈ 11 min
Duopoly Models: Cournot, Bertrand, Stackelberg and Edgeworth
What is conjectural variation? Show how some models of oligopoly are derived on the basis of it.
हिंदी में प्रश्न
आनुमानिक विचरण क्या होता है? प्रदर्शित कीजिए कि अल्पाधिकार के कुछ मॉडल उसके आधार पर कैसे व्युत्पन्न किए जाते हैं।
Practise this question Market Structures notes
Model answer
Paper and question: Paper I, Q2(a)
Approach: Define conjectural variation (Bowley, 1924) and show how its value produces Cournot (zero), Bertrand (zero in prices), Stackelberg (leader's non-zero conjecture), collusion and the competitive outcome, using the general first-order condition.
Conjectural variation (a term associated with A.L. Bowley, 1924) is a firm's belief about how its rival will change output (or price) in response to a change in its own: λ = dqⱼ/dqᵢ. Because oligopolists are interdependent, the equilibrium depends on this conjecture.
General condition: with P = P(Q), Q = q₁ + q₂, firm i maximises πᵢ = P(Q)qᵢ − C(qᵢ). Its first-order condition is P + qᵢ·P′(Q)·(1 + λ) = MCᵢ. The term (1 + λ) captures how much total output is expected to change when the firm changes its own output.
Models derived: (i) Cournot (1838): λ = 0, the rival's output is expected to stay fixed. (ii) Competitive outcome: λ = −1, rivals offset any change, so P = MC. (iii) Collusion (symmetric firms): λ = 1, each expects the rival to match its change, so the industry acts as a monopolist. (iv) Stackelberg (1934): the follower has λ = 0, the leader's conjecture equals the slope of the follower's reaction function (−1/2 with linear demand). (v) Bertrand (1883): zero conjectural variation in prices, giving P = MC with homogeneous goods. (vi) Kinked demand (Sweezy, 1939): rivals match price cuts but not rises.
Diagram: q₁ and q₂ axes with reaction lines; Cournot point where they cross; collusive (contract-curve) points closer to the origin; the competitive point further out; the Stackelberg point on the follower's reaction line.
Assessment: conjectural variation unifies oligopoly models, but in a one-shot game the conjecture is arbitrary; 'consistent conjectures' (Bresnahan, 1981) require beliefs to match actual reactions. Modern theory replaces it with explicit game-theoretic timing.
Q2(b) · Theories of Employment, Income and Interest · 15 marks≈ 11 min
New Classical and New Keynesian Macroeconomics
Show that systematic monetary and fiscal policies are ineffective in controlling output and price level.
हिंदी में प्रश्न
प्रदर्शित कीजिए कि उत्पाद एवं मूल्य स्तर नियंत्रित करने में क्रमबद्ध मौद्रिक एवं राजकोषीय नीतियाँ निष्प्रभावी होती हैं।
Practise this question Theories of Employment, Income and Interest notes
Model answer
Paper and question: Paper I, Q2(b)
Approach: Present the new classical framework (rational expectations, market clearing, Lucas supply) and show that anticipated monetary policy changes only prices; extend to fiscal policy via crowding out and Ricardian equivalence; end with criticism.
The claim is the core of new classical macroeconomics (Lucas, Sargent, Wallace, Barro), which rests on rational expectations (Muth, 1961), continuous market clearing and the Lucas supply function Y = Yn + β(P − Pᵉ).
Monetary policy: a systematic policy follows a known rule. Rational agents incorporate the rule into their expectations, so any planned monetary expansion raises Pᵉ as much as P. Since output deviates from Yn only when P differs from Pᵉ, anticipated money changes the price level but not output or employment (Sargent and Wallace, 1975). Only unanticipated surprises affect output, and they cannot be used systematically.
Fiscal policy: (i) a rise in government spending, if anticipated, also shifts AD and raises Pᵉ, so output stays at Yn; it raises the interest rate and crowds out private spending. (ii) Ricardian equivalence (Barro, 'Are Government Bonds Net Wealth?', 1974): a debt-financed tax cut does not raise consumption, because households save the tax cut to pay the future taxes needed to service the debt.
Diagram: (Y, P) space with a vertical LRAS at Yn and SRAS drawn for given Pᵉ; an anticipated AD shift is matched by an SRAS shift, so the economy moves from E₁ vertically to E₃ (higher P, same Y).
Criticism: nominal rigidities from contracts and menu costs (Fischer, 1977; Taylor, 1980; Mankiw, 1985) give anticipated policy real effects; Ricardian equivalence fails with liquidity constraints and finite horizons; and evidence from recessions shows demand policies do affect output. Still, the argument strengthened the case for credible, rule-based policy.
Q2(c) · Theories of Growth · 20 marks≈ 14 min
Neo-classical (Solow) and Endogenous Growth: Human Capital and R&D
(i) What makes technical progress endogenous? Do you think that technology is a 'non-rival' good?
(ii) Show that if the research becomes more successful, the growth rate will increase and hence the standard of living.
हिंदी में प्रश्न
(i) प्राविधिक प्रगति को अन्तर्जात क्या बनाता है? क्या आप सोचते हैं कि प्रौद्योगिकी एक 'ग़ैर-प्रतिद्वन्द्वी' वस्तु है?
(ii) प्रदर्शित कीजिए कि यदि शोध अधिक सफल हो जाता है, तो वृद्धि दर बढ़ेगी और इसीलिए जीवन-स्तर भी।
Practise this question Theories of Growth notes
Model answer
Paper and question: Paper I, Q2(c)
Approach: (i) Explain what makes technology endogenous (purposeful R&D for profit) and discuss non-rivalry with partial excludability; (ii) use the R&D equation of the Romer model to show that higher research productivity raises the growth rate of A and of income per head.
(i) Technical progress is endogenous when it results from deliberate economic decisions inside the model rather than falling like 'manna from heaven' as in Solow. In Romer (1990) profit-seeking firms and researchers devote resources to R&D because a new design can be patented and sold at a price above marginal cost; the rate of innovation therefore responds to the size of the market, the reward from patents, the stock of human capital and policy.
Technology is a non-rival good: a design, formula or software code can be used by any number of firms at the same time without being used up, unlike a machine or a worker. It is, however, partly excludable, since patents, copyrights and secrecy can stop others from using it for a time. Non-rivalry gives increasing returns (once the idea exists, output can be replicated at constant cost) and spillovers; partial excludability creates the monopoly rents that pay for research. So technology is non-rival but not a pure public good.
(ii) Let output be Y = K^α(A·L_Y)^(1−α) and let new ideas be produced as Ȧ = δ·L_A·A, where L_A is labour in research and δ the productivity (success rate) of research.
Step 1: dividing by A, the growth rate of technology is gA = Ȧ/A = δ·L_A.
Step 2: on the balanced growth path K/Y is constant, so gY = gK, and log-differentiating the production function gives gY = αgK + (1 − α)(gA + n), hence gY = gA + n and output per worker grows at gy = gA = δ·L_A.
Step 3: if research becomes more successful, δ rises, so gA = δL_A rises, and gy rises one-for-one.
In words: more productive research raises the rate at which new ideas arrive, and because income per head grows at the rate of technical progress, living standards rise faster permanently. In Jones's semi-endogenous version (Ȧ = δL_A^λA^φ with φ less than 1), a rise in δ raises growth during the transition and the long-run level of income per head, so living standards are higher in either case.

Question 3 (50 marks)

Q3(a) · Market Structures · 15 marks≈ 11 min
Duopoly Models: Cournot, Bertrand, Stackelberg and Edgeworth
Suppose that we have only two firms in the market with constant marginal costs of C₁ and C₂ respectively such that C₁ > C₂. What is the Bertrand equilibrium in this market? How is it different from the competitive equilibrium?
हिंदी में प्रश्न
मान लीजिए कि हमारे पास स्थिर सीमान्त लागतों क्रमशः C₁ एवं C₂, जैसे कि C₁ > C₂, वाली दो फ़र्में मात्र बाज़ार में हैं। इस बाज़ार में बर्ट्रैन्ड सन्तुलन क्या है? यह प्रतिस्पर्धी सन्तुलन से किस प्रकार भिन्न है?
Practise this question Market Structures notes
Model answer
Paper and question: Paper I, Q3(a)
Approach: Set up Bertrand price competition with asymmetric constant costs, derive the equilibrium (low-cost firm prices just below C₁ and takes the whole market), and contrast it with the competitive equilibrium on price, output, profit and efficiency.
In the Bertrand model (Joseph Bertrand, 1883) firms sell a homogeneous product and compete by setting prices simultaneously; buyers purchase from the cheaper firm and split equally if prices are equal. With equal constant costs the result is P = MC and zero profit (the Bertrand paradox).
Unequal costs, C₁ greater than C₂: firm 1 never prices below C₁, as it would lose on every unit. Firm 2 can therefore set a price just below C₁ (p₂ = C₁ − ε) and capture the whole market, while firm 1 sells nothing; firm 2 has no reason to go lower.
Equilibrium: P ≈ C₁ (strictly, the limit as ε tends to zero), output Q = D(C₁) produced entirely by firm 2, firm 2's profit ≈ (C₁ − C₂)·D(C₁), firm 1's profit zero. This holds provided C₁ is below firm 2's monopoly price; if firm 2's monopoly price is lower than C₁, it simply charges the monopoly price.
Comparison with competitive equilibrium: competition would drive price to the lowest marginal cost C₂, with output D(C₂) and zero profit. Under Bertrand, price is higher (C₁), output lower (D(C₁)), the efficient firm earns (C₁ − C₂)·D(C₁), and a deadweight loss arises under demand between C₂ and C₁. Production is efficient (only the low-cost firm produces), but allocation is not, since P exceeds MC₂.
Diagram: quantity on the horizontal and price on the vertical axis; downward demand D; horizontal lines at C₁ and C₂ (C₁ above); Bertrand equilibrium at price C₁ with quantity D(C₁); competitive equilibrium at C₂ with D(C₂); shade firm 2's profit rectangle and the deadweight triangle.
Q3(b) · Economic Development · 15 marks≈ 11 min
Development and Environmental Sustainability
"Even green energy is not always green." Do you agree? Illustrate your answer taking biofuels as an example.
हिंदी में प्रश्न
"हरित ऊर्जा भी सदैव हरित नहीं होती है।" क्या आप सहमत हैं? जैव ईंधन को उदाहरण के रूप में लेते हुए अपने उत्तर को स्पष्ट कीजिए।
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q3(b)
Approach: Agree: explain why biofuels are considered green, then show the hidden environmental and social costs (land-use change and carbon debt, food versus fuel, water, biodiversity), with examples including India's policy, and conclude with conditions for genuinely green bioenergy.
Yes. 'Green' energy is judged by its life-cycle impact, not just by emissions at the point of use. Biofuels (ethanol from sugarcane or maize, biodiesel from palm oil or jatropha) are considered green because the carbon released when they burn was absorbed by the plants as they grew, and they reduce oil imports.
Why they are not always green: (i) land-use change: clearing forests, peatlands or grasslands to grow biofuel crops releases large stored carbon; Searchinger and co-authors (2008) and Fargione and co-authors (2008) showed that this 'carbon debt' can make some biofuels worse than petrol for decades, as with palm oil on drained peat in Indonesia; (ii) food versus fuel: diverting maize and other crops to fuel contributed to the 2007–08 food price spike, hurting the poor; (iii) water: sugarcane-based ethanol is water-intensive, a concern in drought-prone Maharashtra.
India's experience shows both sides: the jatropha-based biodiesel push of the 2000s largely failed, while ethanol blending under the National Policy on Biofuels (2018) cut oil imports but raised concerns over diverting sugarcane, rice and maize and over water use.
Making them green: second-generation fuels from crop residues and waste, compressed biogas from organic waste, sustainability certification and avoiding conversion of forests and food land.
Hence biofuels are green only when produced from wastes or surplus land with low inputs; otherwise 'green' energy can raise net emissions and harm food security.
Q3(c) · Theories of Employment, Income and Interest · 20 marks≈ 14 min
Keynesian Theory of Income and Employment
You are given the data on the following variables in an economy:
Government spending = 300
Planned investment = 200
Net exports = 50
Autonomous taxes = 250
Income-tax rate = 0·1
Marginal propensity to consume = 0·5
(i) Consumption (C) is 600, when income (Y) is equal to 1500. Solve for autonomous consumption.
(ii) Solve for the equilibrium levels of output denoted (respectively by Y*w and Y*wo) in the two scenarios—presence and absence of income tax in the economy.
(iii) Solve for the change in net exports that would bring the equilibrium output level in the economy with the income tax to the level of Y*wo that you found in (ii). Specify both the magnitude and sign of the change.
[Figures are in ₹ '000 crore, obviously except tax rate and MPC]
हिंदी में प्रश्न
आपको एक अर्थव्यवस्था में निम्नलिखित चरों पर आँकड़े दिए गए हैं :
सरकारी व्यय = 300
नियोजित निवेश = 200
शुद्ध निर्यात = 50
स्वायत्त कर = 250
आयकर दर = 0·1
सीमान्त उपभोग प्रवृत्ति = 0·5
(i) जब आय (Y) 1500 के बराबर है, उपभोग (C) 600 है। स्वायत्त उपभोग हेतु हल कीजिए।
(ii) दो परिदृश्यों—अर्थव्यवस्था में आयकर की उपस्थिति एवं अनुपस्थिति में निर्दिष्ट निर्गत सन्तुलन स्तरों (क्रमशः Y*w व Y*wo) हेतु हल कीजिए।
(iii) आपके द्वारा (ii) में ज्ञात Y*wo के आयकर स्तर वाली अर्थव्यवस्था में सन्तुलन निर्गत स्तर को लाने वाले शुद्ध निर्यातों में परिवर्तन हेतु हल कीजिए। परिवर्तन के परिमाण एवं संकेत दोनों का विवरण दीजिए।
[राशियाँ ₹ '000 करोड़ में हैं, स्पष्टतः कर दर एवं सी॰ उ॰ प्र॰ के अलावा]
Practise this question Theories of Employment, Income and Interest notes
Model answer
Paper and question: Paper I, Q3(c)
Approach: Write the consumption function on disposable income Y − T₀ − tY, solve for autonomous consumption, solve the two equilibria using the expenditure identity, then use the tax-economy multiplier to find the required change in net exports.
In the Keynesian income-expenditure model, equilibrium output satisfies Y = C + I + G + NX, with consumption depending on disposable income: C = a + c(Y − T), where total taxes are T = T₀ + tY (autonomous taxes plus income tax). Figures are in ₹ '000 crore.
Step 1 (i): at Y = 1500, T = 250 + 0.1 × 1500 = 400, so disposable income = 1100. Then 600 = a + 0.5 × 1100 gives a = 600 − 550 = 50.
Step 2 (ii), with income tax: Y = 50 + 0.5(Y − 250 − 0.1Y) + 200 + 300 + 50 = 475 + 0.45Y, so 0.55Y = 475 and Y*w = 863.64 (multiplier 1/[1 − c(1 − t)] = 1/0.55 = 1.818).
Step 3 (ii), without income tax: Y = 50 + 0.5(Y − 250) + 550 = 475 + 0.5Y, so 0.5Y = 475 and Y*wo = 950 (multiplier 1/(1 − c) = 2).
Step 4 (iii): required rise in output ΔY = 950 − 863.64 = 86.36. With the income tax, ΔY = ΔNX/0.55, so ΔNX = 86.36 × 0.55 = 47.5. Check: (475 + 47.5)/0.55 = 950.
Results: autonomous consumption is 50; equilibrium output is 863.64 with the income tax and 950 without it; net exports must rise by 47.5 (₹47,500 crore, a positive change) to bring the tax economy's output up to 950.
Interpretation: the income tax is an automatic stabiliser: it creates a leakage that grows with income, so every rupee of extra spending raises disposable income by only 90 paise and the multiplier falls from 2 to about 1.82. That is why the same autonomous spending of 475 supports a lower equilibrium output when the tax is present. To close the gap of 86.36 the economy needs an injection equal to the gap divided by the multiplier; a rise in exports or a fall in imports of 47.5 does this, and an equal rise in government spending or investment would have the same effect, since all autonomous injections share the same multiplier.
The tax also reduces the economy's sensitivity to shocks: a fall in exports would reduce output less in the tax economy than in the economy without the income tax, which is the stabilising role of proportional taxation emphasised in Keynesian fiscal theory.

Question 4 (50 marks)

Q4(a) · Trade Policy, Protection and the WTO · 15 marks≈ 11 min
Tariffs and Quotas: Effects and Comparison
Many countries subsidize some of their export industries. Use a partial equilibrium model under perfect competition to illustrate the following effects of an export subsidy for a large country:
(i) Welfare effects of an export subsidy
(ii) Which group is winning and which is losing from the subsidy?
हिंदी में प्रश्न
अनेक देश अपने कुछ निर्यात उद्योगों को आर्थिक सहायता (सहायिकी) प्रदान करते हैं। एक विशाल देश हेतु एक निर्यात सहायिकी के निम्नलिखित प्रभावों को स्पष्ट करने के लिए पूर्ण प्रतिस्पर्धा के अन्तर्गत एक आंशिक सन्तुलन मॉडल का उपयोग कीजिए :
(i) एक निर्यात सहायिकी के कल्याणकारी प्रभाव
(ii) सहायिकी से कौन-सा समूह सफल और कौन-सा विफल हो रहा है?
Practise this question Trade Policy, Protection and the WTO notes
Model answer
Paper and question: Paper I, Q4(a)
Approach: Use the partial-equilibrium export-subsidy diagram for a large exporter: show the domestic price rise and world price fall, then (i) the welfare areas and net loss including the terms-of-trade loss, and (ii) gainers and losers.
An export subsidy s is a payment per unit exported. Exporters will sell abroad only if the domestic price rises to the export price plus s, so the domestic price rises; for a large country, the extra exports also lower the world price.
Diagram: home demand D and supply S; free-trade world price Pw with exports S₁ − D₁; with the subsidy the domestic price rises to Ps and the foreign (world) price falls to Ps − s, below Pw; production rises to S₂ and domestic consumption falls to D₂, so exports rise. Label areas: a (consumer loss between Pw and Ps up to D₂), b (consumption triangle), c (producer gain beyond a and b), d (production triangle) and the subsidy cost rectangle b + c + d + e + f + g, where e + f + g is the part below Pw caused by the fall in the world price.
(i) Welfare effects: consumer surplus falls by a + b; producer surplus rises by a + b + c; the government pays the subsidy, s × exports = b + c + d + e + f + g. Net national welfare change = −(b + d) − (e + f + g): the consumption and production distortions plus the terms-of-trade loss, since the country now sells its exports more cheaply. A small country loses only b + d; a large country loses more.
(ii) Winners and losers: domestic producers of the exported good and their workers gain; domestic consumers of the good lose (they pay more); taxpayers lose (they finance the subsidy); foreign consumers gain from the lower world price; foreign producers competing with the exports lose.
This is why the WTO Agreement on Subsidies and Countervailing Measures prohibits export subsidies on non-agricultural goods, and the 2015 Nairobi decision committed members to eliminate agricultural export subsidies.
Q4(b) · Price Determination and Theories of Distribution · 15 marks≈ 11 min
Kaldor and Kalecki: Macro Theories of Distribution
Briefly state the Kaldor's theory of distribution in determining the share of profit and the share of wages in national income. Explain the mechanism behind Kaldor's model.
हिंदी में प्रश्न
राष्ट्रीय आय में लाभ अंश तथा वेतन अंश निर्धारित करने हेतु कैल्डोर के वितरण सिद्धान्त को संक्षेप में व्यक्त कीजिए। कैल्डोर के प्रारूप (मॉडल) की पृष्ठभूमि की यन्त्ररचना की व्याख्या कीजिए।
Practise this question Price Determination and Theories of Distribution notes
Model answer
Paper and question: Paper I, Q4(b)
Approach: State the theory and its equation briefly, then concentrate on the price-wage mechanism that makes saving adjust to investment, with the diagram and conditions.
The theory: Kaldor (1955–56) argued that at full employment the shares of profits and wages are determined by the ratio of investment to output and by the different saving propensities of the two classes, not by marginal productivity.
Equation: from Y = W + P, S = sw·W + sp·P and I = S, the profit share is P/Y = [1/(sp − sw)]·(I/Y) − sw/(sp − sw), and the wage share is 1 − P/Y. With sw = 0, P/Y = (I/Y)/sp.
Mechanism: suppose investment rises at full employment. (1) Aggregate demand exceeds fixed output. (2) Prices rise while money wages lag, so profit margins widen. (3) Income shifts from workers to capitalists. (4) Since sp exceeds sw, total saving rises. (5) This continues until saving equals the higher investment, at a higher profit share; a fall in investment works in reverse.
Diagram: I/Y on the horizontal axis and P/Y on the vertical; an upward line P/Y = [1/(sp − sw)]·(I/Y) − sw/(sp − sw) cutting the horizontal axis at I/Y = sw; show a rise in I/Y from a1 to a2 raising P/Y from π1 to π2.
Conditions: sp greater than sw for stability; the real wage cannot fall below subsistence; the profit share cannot fall below the minimum mark-up; and I/Y must lie between sw and sp so that both shares are positive.
Kaldor's model thus applies the Keynesian multiplier to prices and distribution rather than to output, and expresses the Kaleckian idea that capitalists earn what they spend.
Q4(c) · Theories of Growth · 20 marks≈ 14 min
Neo-classical (Solow) and Endogenous Growth: Human Capital and R&D
Show how the idea of monopolistic competition becomes intrinsic to the endogenous growth theory as postulated by Romer.
हिंदी में प्रश्न
प्रदर्शित कीजिए कि एकाधिकारी प्रतिस्पर्धा का विचार रोमर द्वारा प्रतिपादित अन्तर्जात वृद्धि सिद्धान्त में कैसे अन्तर्भूत हो जाता है।
Practise this question Theories of Growth notes
Model answer
Paper and question: Paper I, Q4(c)
Approach: Explain why non-rival ideas create increasing returns that perfect competition cannot finance, then set out Romer's (1990) three-sector structure with monopolistically competitive intermediate-goods firms, their mark-up pricing and the research arbitrage condition.
Paul Romer ('Endogenous Technological Change', 1990) built growth on the production of ideas. Because an idea is non-rival, output has constant returns in rival inputs (capital and labour) for a given stock of ideas, and hence increasing returns in all inputs including ideas: F(λK, λL, λA) is greater than λF(K, L, A).
With increasing returns, paying every input its marginal product would exhaust more than total output (Euler's theorem fails). With price equal to marginal cost, which is zero for an existing idea, nothing would reward the fixed cost of inventing it. Innovation therefore requires market power: some form of imperfect competition is intrinsic to endogenous technical change.
Structure: (i) a competitive final-goods sector produces Y = L_Y^(1−α)·Σ x_j^α, summed over j = 1 to A, using labour and A varieties of intermediate goods (the Dixit-Stiglitz form); (ii) an intermediate-goods sector in which each variety is produced by one firm holding a perpetual patent on its design, so each faces a downward-sloping demand curve p_j = αL_Y^(1−α)x_j^(α−1) with constant elasticity 1/(1 − α); (iii) a research sector producing new designs, Ȧ = δH_A·A.
Pricing: each intermediate firm, with marginal cost r (the rental on capital), sets the monopoly price p = r/α, a constant mark-up 1/α over marginal cost. This is monopolistic competition: many firms, free entry through invention, differentiated products and positive profits per firm.
Research arbitrage: free entry into research continues until the cost of a design equals the present value of its monopoly profits, P_A = π/r, which pins down the growth rate g = δH_A.
Thus monopolistic competition is not an add-on but the mechanism that makes innovation privately profitable; it also implies that the market growth rate is below the social optimum, justifying research subsidies.

Question 5 (50 marks)

Q5(a) · Welfare Economics · 10 marks≈ 7 min
Social Welfare Functions and Arrow's Impossibility Theorem
State Arrow's five reasonable conditions which a social welfare function must satisfy.
हिंदी में प्रश्न
ऐरो की पाँच तर्कसंगत दशाओं का उल्लेख कीजिए, जिन्हें एक सामाजिक कल्याण प्रकार्य को अवश्य संतुष्ट करना चाहिए।
Practise this question Welfare Economics notes
Model answer
Paper and question: Paper I, Q5(a)
Approach: List Arrow's conditions precisely with a one-line meaning each, and state the theorem in one sentence.
Kenneth Arrow (Social Choice and Individual Values, 1951) asked whether individual preference orderings can be aggregated into a social ordering by a rule (a social welfare function) satisfying reasonable conditions:
1. Collective rationality: the social ordering must be complete and transitive (if society prefers x to y and y to z, it prefers x to z).
2. Unrestricted domain: the rule must work for every logically possible set of individual orderings.
3. Pareto principle (weak): if every individual prefers x to y, society must prefer x to y.
4. Independence of irrelevant alternatives: the social ranking of x and y depends only on individuals' rankings of x and y, not on their views of a third alternative z.
5. Non-dictatorship: there is no individual whose strict preference always becomes society's preference regardless of others.
Theorem: with at least three alternatives and two individuals, no social welfare function satisfies all five; majority voting can cycle (Condorcet's paradox).
Q5(b) · Theories of International Trade · 10 marks≈ 7 min
Product Cycle, New Trade Theory and Strategic Trade Policy
In the context of international trade theory, discuss in detail the various stages of the international product life cycle.
हिंदी में प्रश्न
अन्तर्राष्ट्रीय व्यापार सिद्धान्त के सन्दर्भ में अन्तर्राष्ट्रीय उत्पाद जीवन-चक्र के विभिन्न चरणों की सविस्तार विवेचना कीजिए।
Practise this question Theories of International Trade notes
Model answer
Paper and question: Paper I, Q5(b)
Approach: Set out Vernon's (1966) product life cycle stages (new, maturing, standardised; with the later decline/import stage), what happens to production, exports and location in each, with a diagram and example.
Raymond Vernon ('International Investment and International Trade in the Product Cycle', 1966) explained how the location of production and the direction of trade change as a product ages.
Stage 1, new product: innovation occurs in a high-income, skill-rich country such as the US, close to demanding consumers and engineers; production is small, costly and non-standardised; little is exported. Stage 2, maturing product: demand grows at home and in other rich countries; the innovator exports, techniques become more standard, and firms begin producing in other advanced countries to serve their markets. Stage 3, standardised product: technology is widely known and price competition dominates, so production shifts to low-wage developing countries; the innovating country becomes a net importer.
Diagram: time on the horizontal axis and quantity on the vertical; the innovator's production and consumption curves, with its net exports positive at first and negative later, while the developing country's net exports turn positive in the final stage.
Examples include radios, televisions and personal computers, whose production moved from the US to Japan and then to East Asia and China. The theory combines technology, economies of scale and FDI; it is weaker today, when multinationals launch products simultaneously worldwide.
Q5(c) · Economic Development · 10 marks≈ 7 min
Development and Environmental Sustainability
Discuss the issue of compatibility between international trade and environment sustainability.
हिंदी में प्रश्न
अन्तर्राष्ट्रीय व्यापार तथा पर्यावरणीय संधारणीयता के मध्य संगतता विषय की विवेचना कीजिए।
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q5(c)
Approach: Show both sides: trade can harm the environment (scale effect, pollution havens, transport emissions) or help it (composition and technique effects, diffusion of clean technology), then discuss WTO rules and border measures.
Grossman and Krueger (1991) decomposed the environmental effect of trade into a scale effect (more output, more pollution), a composition effect (specialisation according to comparative advantage) and a technique effect (higher income and access to cleaner technology reduce pollution per unit).
Conflict: trade expands output and transport emissions; under the pollution haven hypothesis, dirty industries move to countries with lax regulation, a 'race to the bottom'; and trade in timber, fish and wildlife can accelerate depletion.
Compatibility: trade spreads clean technologies such as solar panels, raises incomes that increase demand for environmental quality, and allows production where it is most resource-efficient.
WTO rules permit environmental measures under Article XX if they are non-discriminatory (Shrimp-Turtle case, 1998). Border carbon adjustments such as the EU's CBAM (definitive from 2026) raise concerns of green protectionism for developing countries. Compatibility therefore requires environmental policy, not trade restriction, as the first-best response.
Q5(d) · Public Finance · 10 marks≈ 7 min
Role of Government in a Market Economy: Allocation, Distribution, Stabilisation and Development
In the context of a developing economy, do you think that fiscal policy is more effective than monetary policy? Give reasons in support of your answer.
हिंदी में प्रश्न
एक विकासशील अर्थव्यवस्था के सन्दर्भ में क्या आप सोचते हैं कि मुद्रा नीति की तुलना में राजकोषीय नीति अधिक प्रभावी है? अपने उत्तर के पक्ष में कारण प्रस्तुत कीजिए।
Practise this question Public Finance notes
Model answer
Paper and question: Paper I, Q5(d)
Approach: Take a reasoned position (fiscal policy is generally more effective in a developing economy), give structural reasons, then note the limits and the need for coordination.
In a developing economy fiscal policy is usually more effective than monetary policy, because the channels through which monetary policy works are weak.
First, monetary transmission is weak: financial markets are shallow, a large informal sector borrows from moneylenders, and investment is less sensitive to interest rates than to infrastructure and demand. In IS-LM terms the IS curve is steep, so a shift of LM changes output little.
Second, the main problems are structural: supply bottlenecks, unemployment and poverty. Public investment in roads, power and irrigation raises both demand and capacity, and the multiplier is high where the marginal propensity to consume is high.
However, fiscal policy has limits: large deficits, high public debt and recognition and implementation lags. Much inflation in India comes from food supply shocks, which neither policy cures quickly, and since 2016 the RBI's flexible inflation targeting has improved monetary credibility.
Hence fiscal policy is the stronger instrument for growth and development, while monetary policy is better for price stability; the two work best together.
Q5(e) · Economic Development · 10 marks≈ 7 min
Planning, Tinbergen, Market versus Planning and Public-Private Partnership
Explain how public-private partnership helps in the rapid economic development of a country.
हिंदी में प्रश्न
एक देश के द्रुतगामी आर्थिक विकास में सार्वजनिक-निजी साझेदारी कैसे सहायता करती है, व्याख्या कीजिए।
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q5(e)
Approach: Define PPP and explain the channels through which it speeds development (finance, efficiency, speed, risk sharing, innovation), with examples and a caveat.
A public-private partnership (PPP) is a long-term arrangement in which the private sector finances, builds and operates infrastructure or services that the state traditionally provided, sharing risks and rewards under a contract.
How it speeds development: (i) it adds private finance to scarce public funds, easing the infrastructure gap; (ii) private management brings efficiency, technology and better maintenance, since the operator bears whole-life costs; (iii) projects are often completed faster, as payment depends on completion and performance; (iv) construction and operating risks are shifted to the party best able to bear them; (v) better infrastructure lowers logistics costs and crowds in private investment, raising growth.
India's PPP airports (Delhi, Mumbai, Hyderabad, Bengaluru), ports such as Mundra and highways built under BOT and the Hybrid Annuity Model illustrate these gains.
But PPPs need sound contracts, risk sharing and regulation; poorly designed ones lead to renegotiation and stalled projects.

Question 6 (50 marks)

Q6(a) · Balance of Payments and Exchange Rates · 15 marks≈ 11 min
Policy Mix: Swan Diagram, Mundell's Assignment and Mundell-Fleming
In an economy, the government is trying to boost the local economy by a massive advertisement 'buy local—local is best'.
(i) Assuming that the public tend to be persuaded by the campaign, what effect might this have on the economy's multiplier?
(ii) Critics argue that this is unfair and leads to distortions in free trade. Examine how the economy performs here under flexible exchange rate system.
हिंदी में प्रश्न
एक अर्थव्यवस्था में, सरकार एक बड़े विज्ञापन 'देशी खरीदें—देशी सर्वोत्तम' द्वारा स्थानीय अर्थव्यवस्था को प्रोत्साहित करने का प्रयास कर रही है।
(i) यह मानते हुए कि जनता इस अभियान से सम्मत होती प्रवृत्त है, अर्थव्यवस्था के गुणक पर इसका क्या प्रभाव हो सकता है?
(ii) समालोचक यह तर्क करते हैं कि यह अनुचित है तथा मुक्त व्यापार में विरूपताओं को प्रेरित करता है। परीक्षण कीजिए कि लचीले विनिमय दर तन्त्र के अन्तर्गत यहाँ अर्थव्यवस्था कैसा प्रदर्शन करती है।
Practise this question Balance of Payments and Exchange Rates notes
Model answer
Paper and question: Paper I, Q6(a)
Approach: (i) Show that a successful 'buy local' campaign lowers the marginal propensity to import and so raises the multiplier 1/(s + m); (ii) under floating rates (Mundell-Fleming), show that the rise in net exports appreciates the currency, offsetting the gain, and discuss the distortion and WTO angle.
(i) In an open economy the multiplier is k = 1/(s + m), where s is the marginal propensity to save and m the marginal propensity to import. If the campaign persuades people to spend more of each extra rupee on domestic goods, m falls and the leakage into imports shrinks, so the multiplier rises. For example, if s = 0.2 and m falls from 0.3 to 0.2, k rises from 2 to 2.5. The campaign also shifts autonomous demand from imports to home goods, raising output at once.
(ii) Under a flexible exchange rate the outcome differs. Lower demand for imports reduces the demand for foreign currency, so the domestic currency appreciates. Appreciation makes exports dearer and imports cheaper, reducing net exports again. In the Mundell-Fleming model with perfect capital mobility, the campaign acts like a rightward shift of IS; with LM unchanged and r fixed at the world rate, the currency appreciates until net exports return to their original level, so output does not rise at all. With limited capital mobility the gain is partial.
Diagram: IS-LM with a horizontal BP at r*; the campaign shifts IS right; appreciation shifts it back to the original position; output stays at Y1, with a stronger currency.
Critics are right that 'buy local' is a non-tariff barrier: it distorts consumer choice away from comparative advantage, invites retaliation, and, if implemented through government procurement or discriminatory rules, may conflict with WTO national-treatment obligations. Under floating rates it mainly shifts production from export industries to import-competing industries rather than raising total output.
Q6(b) · Theories of Employment, Income and Interest · 15 marks≈ 11 min
Investment, Business Cycles and Aggregate Demand–Supply
What do you mean by Tobin's 'q' theory of investment? How would you modify the standard IS-LM functions in the presence of Tobin's 'q'?
हिंदी में प्रश्न
टोबिन के 'q' निवेश सिद्धान्त से आपका क्या तात्पर्य है? टोबिन के 'q' की उपस्थिति में मानक IS-LM फलनों को आप कैसे किंचित् परिवर्तित करेंगे?
Practise this question Theories of Employment, Income and Interest notes
Model answer
Paper and question: Paper I, Q6(b)
Approach: Define Tobin's q (market value of capital over replacement cost) and the investment rule (invest when q exceeds 1), explain the link with the stock market and interest rates, then show how IS-LM is modified by making investment a function of q and adding wealth effects.
Tobin's q (James Tobin, 'A General Equilibrium Approach to Monetary Theory', 1969) is the ratio of the market value of a firm's capital, as valued by the stock market, to the replacement cost of that capital: q = market value of installed capital / replacement cost.
Investment rule: if q exceeds 1, the market values capital more than it costs to produce, so firms can raise funds by issuing shares and profitably add capital; investment rises. If q is less than 1, it is cheaper to buy existing firms than to build new capital, and investment falls. Hence I = I(q), with I′(q) positive. Hayashi (1982) showed that, under certain conditions, marginal q (which drives investment) equals the observable average q.
Modified IS-LM: since firm values discount expected profits, q rises when r falls or profit expectations improve. (i) Investment in IS becomes I = I(q(r, expected profits)): a lower r raises share prices, q and investment, an asset-price channel behind the negative slope. (ii) Stock-market confidence shifts q and IS independently of r. (iii) Higher equity prices raise wealth and consumption (Modigliani's life-cycle model). (iv) In Tobin's portfolio framework money demand also depends on equity yields, so monetary policy works through relative asset yields.
Diagram: r on the vertical and Y on the horizontal axis; an easing of monetary policy shifts LM right, lowering r; the lower r raises q, so investment rises along IS; a stock-market boom independently shifts IS right to IS₂.
Q6(c) · Money and Monetary Management · 20 marks≈ 14 min
Keynes and Post-Keynesian Theories of Demand for Money
Explain how Keynesian speculative demand for money is restated in regressive expectation model. Point out its limitations.
हिंदी में प्रश्न
व्याख्या कीजिए कि कीन्सवादी आनुमानिक मुद्रा माँग, प्रतिगामी प्रत्याशा मॉडल में कैसे पुनर्कथित है। इसकी सीमाओं को इंगित कीजिए।
Practise this question Money and Monetary Management notes
Model answer
Paper and question: Paper I, Q6(c)
Approach: Restate Keynes' speculative demand as the regressive-expectations model (normal rate, capital gains, critical rate), show individual and aggregate demand curves, then list its limitations.
Keynes (1936) explained the speculative demand for money by uncertainty about future interest rates. Tobin (1958) showed that Keynes' argument can be restated as a model of regressive expectations: every investor believes there is a normal rate rₙ to which the current rate r will return.
Restatement: a bond paying ₹1 a year forever is priced at 1/r. If the rate is expected to return to rₙ, the expected capital gain or loss per rupee invested is g = r/rₙ − 1. The investor compares the expected return on bonds, r + g, with zero, the return on money. Bonds are held if r + r/rₙ − 1 is positive, i.e. if r exceeds the critical rate r_c = rₙ/(1 + rₙ); otherwise money is held. For example, with rₙ = 5 per cent, r_c ≈ 4.76 per cent.
Demand curves: each individual's speculative demand is a step function: zero money above r_c and all wealth in money below it. Because normal rates differ across individuals, aggregating the steps gives Keynes' smooth, downward-sloping speculative demand; when nearly everyone's critical rate is above the current rate, demand becomes perfectly elastic (the liquidity trap).
Diagram: left panel, an individual's step-shaped demand for money with the step at r_c; right panel, the aggregate demand curve, smooth and flattening at low rates into the liquidity trap.
Limitations: (i) individuals hold undiversified, all-or-nothing portfolios, contrary to evidence; (ii) the slope of aggregate demand rests on dispersion of expectations, not on individual behaviour; (iii) normal rates are assumed fixed; if they adjust to experience, speculative demand vanishes in the long run, and the relation between r and money demand becomes unstable; (iv) risk is ignored, since expectations are held with certainty; (v) it cannot explain why people hold money rather than short-term, capital-certain assets such as savings deposits or Treasury bills.

Question 7 (50 marks)

Q7(a) · Theories of Growth · 15 marks≈ 11 min
Lewis Model of Development with Surplus Labour (and Ranis-Fei)
Describe Lewis model of development in an economy with unlimited supply of labour. Is Lewis model really capital-driven? Give reasons.
हिंदी में प्रश्न
असीमित श्रम आपूर्ति वाली एक अर्थव्यवस्था में विकास के लुईस मॉडल का वर्णन कीजिए। क्या लुईस का मॉडल वस्तुतः पूँजी-प्रेरित है? कारण बताइए।
Practise this question Theories of Growth notes
Model answer
Paper and question: Paper I, Q7(a)
Approach: Describe the Lewis model briefly (dualism, unlimited labour, reinvestment, turning point) with the diagram, then assess whether it is capital-driven: yes in mechanism, but with qualifications.
Lewis model (1954): a dual economy has a subsistence sector with surplus labour of zero marginal product and a capitalist sector that can hire unlimited labour at a constant institutional wage slightly above subsistence. Capitalists employ labour up to where its marginal product equals the wage, reinvest their profits, and the expanding capital stock absorbs more labour until the surplus is exhausted at the turning point.
Diagram: labour on the horizontal axis and wage on the vertical; a horizontal supply at W; marginal product curves MP1, MP2, MP3 shifting out with capital; employment rising from L1 to L3; profits as the area between each MP curve and W.
Is it capital-driven? Yes, in its mechanism: the only engine of growth is capital accumulation in the modern sector financed by reinvested profits; Lewis said the central problem is to raise saving from about 5% to 12% of national income, and the speed of labour absorption equals the speed of capital accumulation. Labour is passive and available at a fixed wage.
But the qualifications show it is not only capital: (i) if new capital embodies labour-saving technology, employment need not rise (Todaro's critique); (ii) the transfer requires a rising agricultural surplus to feed workers, otherwise food prices and wages rise and profits are squeezed (Ranis and Fei, 1961, stressed balanced growth of agriculture); (iii) skills, institutions and demand also matter.
Hence the model is essentially capital-driven, which is both its clarity and its weakness.
Q7(b) · Trade Policy, Protection and the WTO · 15 marks≈ 11 min
Trade Blocs, Customs Unions and Monetary Unions
Explain how trade blocks are important in the process of economic globalization. Illustrate your answer with suitable examples.
हिंदी में प्रश्न
व्याख्या कीजिए कि आर्थिक भूमण्डलीकरण की प्रक्रिया में व्यापारिक ब्लॉक कैसे महत्त्वपूर्ण हैं। अपने उत्तर को उपयुक्त उदाहरणों से स्पष्ट कीजिए।
Practise this question Trade Policy, Protection and the WTO notes
Model answer
Paper and question: Paper I, Q7(b)
Approach: Explain how trade blocs act as building blocks of globalisation (deeper integration, value chains, investment, new rules, bargaining), with examples (EU, ASEAN, USMCA, RCEP, CPTPP, India's FTAs), and note the stumbling-block view.
Trade blocs are agreements among groups of countries to reduce barriers among themselves; the number of regional trade agreements notified to the WTO has grown to several hundred since 1990.
Importance for globalisation: (i) deeper and faster liberalisation: blocs cut tariffs and also cover services, investment, standards and competition, which multilateral talks have struggled to achieve, as the EU's single market shows; (ii) regional value chains: the North American agreement (NAFTA, 1994, now USMCA, 2020) integrated car production across the US, Mexico and Canada, and ASEAN and East Asian agreements built electronics networks; (iii) investment: larger, rule-bound markets attract FDI; (iv) laboratories for new rules on digital trade, e-commerce and intellectual property, later taken to the WTO; (v) building blocks: open regionalism can expand membership and converge towards multilateral free trade, as with the EU's enlargement and RCEP (signed 2020) linking ASEAN, China, Japan, Korea, Australia and New Zealand.
India has used FTAs for market access, such as the India-UAE CEPA (2022), the India-Australia ECTA (2022) and the India-EFTA TEPA (2024), though it stayed out of RCEP in 2019.
Bhagwati warned that blocs can be stumbling blocks, diverting trade and creating a 'spaghetti bowl' of rules of origin. They support globalisation when they are open and WTO-consistent (GATT Article XXIV).
Q7(c) · Market Structures · 20 marks≈ 14 min
Duopoly Models: Cournot, Bertrand, Stackelberg and Edgeworth
Two firms produce homogeneous outputs with cost functions C₁ = q₁², C₂ = 2q₂² and the inverse market demand function P = 100 − (q₁ + q₂). Show that at the Cournot-Nash equilibrium, firm 2 makes higher profit than at the joint profit maximizing equilibrium. Explain why this is so.
हिंदी में प्रश्न
दो फ़र्में लागत फलनों C₁ = q₁², C₂ = 2q₂² तथा प्रतिलोम बाज़ार माँग फलन P = 100 − (q₁ + q₂) सहित समरूपी निर्गतों का उत्पादन करती हैं। प्रदर्शित कीजिए कि कुर्नो-नैश सन्तुलन पर फ़र्म 2 संयुक्त मुनाफ़ा बढ़ाने वाले सन्तुलन की तुलना में उच्चतर मुनाफ़ा कमाती है। व्याख्या कीजिए कि यह ऐसा क्यों है।
Practise this question Market Structures notes
Model answer
Paper and question: Paper I, Q7(c)
Approach: Derive both reaction functions and solve for the Cournot-Nash outputs, price and profits; then solve the joint-profit problem by equating each firm's MC to industry MR; compare firm 2's profits and explain the reallocation of output.
Firms with different, rising marginal costs compete in quantities. The Cournot-Nash equilibrium is where each firm's output is its best response to the other's, found by solving the two reaction functions together; the joint profit maximum is where the two act as a cartel, choosing total output where industry marginal revenue equals marginal cost and allocating it so that the two firms' marginal costs are equal, as a multi-plant monopolist would.
Step 1 (Cournot, firm 1): π₁ = (100 − q₁ − q₂)q₁ − q₁². FOC: 100 − 2q₁ − q₂ − 2q₁ = 0, so q₁ = 25 − q₂/4.
Step 2 (Cournot, firm 2): π₂ = (100 − q₁ − q₂)q₂ − 2q₂². FOC: 100 − q₁ − 2q₂ − 4q₂ = 0, so q₂ = (100 − q₁)/6.
Step 3: substituting, q₁ = 25 − (100 − q₁)/24, so 23q₁ = 500: q₁ = 500/23 ≈ 21.74; q₂ = 300/23 ≈ 13.04; Q = 800/23 ≈ 34.78; P = 1500/23 ≈ 65.22.
Step 4: π₁ = P·q₁ − q₁² = (750,000 − 250,000)/529 ≈ 945.18; π₂ = P·q₂ − 2q₂² = (450,000 − 180,000)/529 ≈ 510.40.
Step 5 (joint maximisation): maximise (100 − Q)Q − q₁² − 2q₂². Conditions: MR = 100 − 2Q = MC₁ = 2q₁ = MC₂ = 4q₂. Hence q₁ = 2q₂, and 100 − 6q₂ = 4q₂ gives q₂ = 10, q₁ = 20, Q = 30, P = 70 (check: MR = 40 = MC₁ = MC₂).
Step 6: π₁ = 70 × 20 − 400 = 1,000; π₂ = 70 × 10 − 200 = 500; joint profit 1,500 against 1,455.58 under Cournot.
Result: firm 2 earns about 510.40 at the Cournot-Nash equilibrium but only 500 at the joint profit maximum, so its profit is higher under Cournot, while firm 1's profit rises from 945.18 to 1,000.
Why: joint profit maximisation equates the marginal costs of the two firms, so output is shifted towards firm 1, whose marginal cost rises more slowly (2q₁ against 4q₂). Firm 2's output is cut from 13.04 to 10; the higher cartel price (70 against 65.22) does not compensate for this loss of volume. The cartel raises total industry profit but distributes the gain unevenly: firm 1 gains about 54.8 while firm 2 loses about 10.4. This is why a cartel among unequal firms needs side payments (firm 1 compensating firm 2) to be acceptable, and why firm 2 has a strong incentive to cheat by expanding output beyond its quota. It illustrates the general point, made by Stigler (1964), that cartels are unstable when members have different costs.

Question 8 (50 marks)

Q8(a) · Economic Development · 15 marks≈ 11 min
Trade, Foreign Investment and Multinationals in Development
Explain the recent changes in the trade and investment flows among different countries in the world. Discuss the major factors that led to these changes.
हिंदी में प्रश्न
विश्व में विभिन्न देशों के मध्य व्यापार एवं निवेश प्रवाहों में अभिनूतन परिवर्तनों की व्याख्या कीजिए। इन परिवर्तनों के प्रमुख मार्गदर्शी कारकों की विवेचना कीजिए।
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q8(a)
Approach: Describe the main changes in world trade and investment flows (rise of Asia and China, GVCs, services and digital trade, slowbalisation after 2008, trade wars and COVID shock), then explain the factors behind them.
Changes in trade flows: (i) the share of developing countries, especially East Asia, in world trade has risen sharply; China became the largest merchandise exporter by 2009; (ii) trade in intermediate goods within global value chains now accounts for most of world trade; (iii) services and digitally delivered trade have grown faster than goods; (iv) South-South trade has expanded; (v) after the 2008 crisis the ratio of trade to world GDP stopped rising, a phase called 'slowbalisation'; (vi) the US-China tariff war from 2018 and the COVID-19 shock of 2020 disrupted supply chains.
Changes in investment flows: FDI shifted towards developing Asia, with China, India and ASEAN as major hosts; developing countries such as China became significant outward investors; and global FDI fell sharply in 2020.
Factors: (i) liberalisation: the Uruguay Round and WTO (1995), China's WTO accession (2001) and reforms in India from 1991; (ii) falling transport and communication costs, containerisation and the IT revolution; (iii) labour-cost differences and large emerging markets; (iv) regional trade agreements such as ASEAN and later RCEP (signed 2020); (v) after 2008, weaker demand, rising protectionism and China's rebalancing towards domestic production; (vi) geopolitical tensions, concerns over supply-chain resilience and pandemic disruption, leading to reshoring and 'China plus one' strategies.
These changes create opportunities for countries like India to integrate into reconfigured value chains, through schemes such as the production-linked incentives of 2020.
Q8(b) · Welfare Economics · 15 marks≈ 11 min
Pareto Optimality and the Fundamental Theorems of Welfare Economics
In an economy with only two commodities, two consumers and two producers with single factor of production, derive the necessary conditions for Pareto optimality in a 'perfect' economy.
हिंदी में प्रश्न
किन्हीं दो वस्तुओं, दो उपभोक्ताओं तथा एक उत्पादन कारक वाले मात्र दो उत्पादकों वाली अर्थव्यवस्था में, एक 'आदर्श' अर्थव्यवस्था में परेटो इष्टतमता हेतु आवश्यक स्थितियों को व्युत्पन्न कीजिए।
Practise this question Welfare Economics notes
Model answer
Paper and question: Paper I, Q8(b)
Approach: Set up the economy (two goods produced with labour only, two consumers), derive the exchange, production and product-mix conditions by maximising one consumer's utility, and show how perfect competition satisfies them.
The economy: consumers A and B consume X and Y; producer 1 makes X = f(L₁), producer 2 makes Y = g(L₂), with L₁ + L₂ = L̄. Pareto optimality means maximising Uᴬ subject to Uᴮ = Ūᴮ, xᴬ + xᴮ = f(L₁) and yᴬ + yᴮ = g(L̄ − L₁).
Condition 1, exchange: the first-order conditions give MRSᴬₓᵧ = MRSᴮₓᵧ: both consumers' indifference curves are tangent (a point on the exchange contract curve).
Condition 2, production: with a single factor, production is efficient when no labour is idle and, if both producers could make the same good, the marginal product of labour in that good is equal across them; with each producer specialised, full employment of L̄ puts the economy on its production possibility curve.
Condition 3, product mix: shifting dL of labour from Y to X raises X by f′·dL and lowers Y by g′·dL, so MRTₓᵧ = g′(L₂)/f′(L₁) = MPLᵧ/MPLₓ. Optimality requires MRSᴬₓᵧ = MRSᴮₓᵧ = MRTₓᵧ.
Second-order conditions: convex indifference curves and a production possibility curve concave to the origin (diminishing marginal products).
Perfect economy: under perfect competition each consumer sets MRS = Px/Py; each producer hires labour until w = Px·f′ = Py·g′, so Px/Py = g′/f′ = MRT. Hence MRSᴬ = MRSᴮ = Px/Py = MRT, and the competitive equilibrium is Pareto optimal (first fundamental theorem), provided there are no externalities or public goods.
Diagram: the concave production possibility curve with an Edgeworth exchange box drawn inside it from the origin to the chosen output point; at the efficient point the slope of the indifference curves' common tangent equals the slope of the PPC.
Q8(c) · Public Finance · 20 marks≈ 14 min
Subsidies, Limits to Taxation and Tax Reform
Discuss different forms of subsidies. Explain how perverse subsidies are detrimental to the economy and environment in the long run.
हिंदी में प्रश्न
सहायिकियों के विभिन्न रूपों की विवेचना कीजिए। विप्रतीप सहायिकियाँ अर्थव्यवस्था एवं पर्यावरण हेतु दीर्घकाल में कैसे हानिकारक होती हैं, व्याख्या कीजिए।
Practise this question Public Finance notes
Model answer
Paper and question: Paper I, Q8(c)
Approach: Classify subsidies (by form and by purpose), define perverse subsidies, and explain their long-run economic and environmental harm with Indian and global examples.
A subsidy is a payment or concession by government that lowers the price paid by a buyer or raises the price received by a producer. Subsidies are justified for merit goods, positive externalities and equity.
Forms: (i) direct cash transfers (DBT, PM-KISAN); (ii) price subsidies on consumption (food under NFSA, LPG) or inputs (fertiliser, power, irrigation water); (iii) production and export subsidies (production-linked incentives); (iv) interest subsidies and credit guarantees; (v) tax expenditures such as exemptions and concessions; (vi) in-kind transfers (mid-day meals); and (vii) implicit subsidies through under-priced public services. They may be explicit (budgeted) or implicit (hidden in low user charges).
Perverse subsidies, a term popularised by Norman Myers and Jennifer Kent (Perverse Subsidies, 2001), are subsidies that harm both the economy and the environment.
Economic harm: they distort relative prices, cause over-use of the subsidised input and create deadweight loss; they are regressive when richer users consume more (large farmers using more free power); they crowd out public investment, as input subsidies in Indian agriculture grew while public capital formation stagnated; and they become politically hard to withdraw.
Environmental harm: free or flat-rate electricity in Punjab and Haryana encourages over-pumping, and groundwater tables are falling; the bias towards urea has distorted the N:P:K ratio, degrading soil health; MSP procurement favouring rice and wheat locks water-intensive crops into dry regions; and fossil-fuel subsidies worldwide encourage emissions and delay the shift to renewables. Fishing subsidies drive over-fishing, which the WTO Agreement on Fisheries Subsidies (2022) addresses.
Reform lies in replacing price subsidies with targeted direct transfers, pricing inputs at closer to cost (as with petrol and diesel deregulation in 2010 and 2014), and redirecting savings to public investment and green technology.

UPSC Mains 2020 Economics Paper II