UPSC Mains 2016 Economics Optional Question Papers with Model Answers

All 56 questions of the 2016 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 2016 Economics Paper I

Question 1 (50 marks)

Q1(a) · Price Determination and Theories of Distribution · 10 marks≈ 7 min
Marshallian and Walrasian Approaches to Price Determination
State Marshallian and Walrasian stability condition of market equilibrium. Do you think that existence of Marshallian stability necessarily ensures Walrasian stability and vice versa? Explain.
हिंदी में प्रश्न
बाज़ार संतुलन की मार्शल एवं वालरास की स्थिरता दशा का कथन कीजिए। क्या आप समझते हैं कि मार्शल द्वारा वर्णित स्थिरता की स्थिति आवश्यक रूप से वालरास की स्थिरता स्थिति को सुनिश्चित करती है और कि विपरीत स्थिति में भी ऐसा ही होता है? व्याख्या कीजिए।
Practise this question Price Determination and Theories of Distribution notes
Model answer
Paper and question: Paper I, Q1(a)
Approach: State both conditions precisely, then answer 'no' and show the cases where one holds without the other.
Walrasian condition (Walras, 1874): with dP/dt = k·[D(P) − S(P)], equilibrium is stable if a price above P* creates excess supply, i.e. D′(P) − S′(P) is negative.
Marshallian condition (Marshall, 1890): with dQ/dt = k·[Pd(Q) − Ps(Q)], equilibrium is stable if beyond Q* supply price exceeds demand price, i.e. Pd′(Q) − Ps′(Q) is negative.
Answer: neither guarantees the other; both hold together only for a downward demand and an upward supply curve.
Final answer: neither guarantees the other; both hold together only for a downward demand and an upward supply curve.
Q1(b) · Market Structures · 10 marks≈ 7 min
Oligopoly: Kinked Demand, Collusion, Price Leadership and Game Theory
State Bain's limit price theory.
हिंदी में प्रश्न
बैन की सीमा कीमत थियोरी का कथन कीजिए।
Practise this question Market Structures notes
Model answer
Paper and question: Paper I, Q1(b)
Approach: State Bain's limit price idea (price set below the short-run profit maximum to deter entry), the role of entry barriers and the conditions, with a diagram.
Joe S. Bain ('A Note on Pricing in Monopoly and Oligopoly', American Economic Review, 1949; Barriers to New Competition, 1956) argued that established firms do not set the short-run profit-maximising price, but a limit price: the highest price that does not attract entry.
Mechanism: entrants face entry barriers: absolute cost advantages of incumbents (patents, raw materials), economies of scale, and product differentiation. The limit price lies just below the entrant's minimum average cost, PL = LACₑ (minimum) − ε, so entry is unprofitable.
Trade-off: incumbents sacrifice some short-run profit (PL is below the monopoly price Pm) to protect long-run profits. Bain classified entry as blockaded (the monopoly price itself deters entry), effectively impeded (limit pricing needed) or ineffectively impeded (entry happens).
Diagram: industry demand D with MR; incumbent's LAC below the entrant's LACₑ; monopoly price Pm where MR = MC; limit price PL just below the entrant's minimum LACₑ, with higher output QL.
Criticism: the Bain-Sylos-Modigliani postulate (incumbents keep output unchanged after entry) may not be credible; game theory (Milgrom and Roberts, 1982) explains limit pricing as signalling low costs.
Q1(c) · Market Structures · 10 marks≈ 7 min
Oligopoly: Kinked Demand, Collusion, Price Leadership and Game Theory
Explain kinked demand curve theory with the help of diagram.
हिंदी में प्रश्न
रेखाचित्र की सहायता से विकृत माँग वक्र थियोरी को स्पष्ट कीजिए।
Practise this question Market Structures notes
Model answer
Paper and question: Paper I, Q1(c)
Approach: Explain the asymmetric reaction assumption, the kink and MR gap, and price rigidity, with the diagram described; one line of criticism.
The kinked demand curve theory (Paul Sweezy, 1939; Hall and Hitch, 1939) explains why prices in oligopoly tend to remain stable even when costs change.
Assumption: an oligopolist expects rivals to follow a price cut but not a price rise. Above the current price its demand is elastic (a rise loses customers to rivals); below it, demand is inelastic (a cut is matched, so few customers are gained). The demand curve therefore has a kink at the prevailing price.
MR gap: the MR curve has two segments corresponding to the two parts of demand, with a vertical discontinuity at the kinked output.
Diagram: price on the vertical and quantity on the horizontal axis; demand curve dKD with a flat segment dK above the kink K and a steep segment KD below; MR with a vertical gap AB at output Q*; MC₁ and MC₂ both passing through AB, so price stays at P* and output at Q*.
Price rigidity: as long as MC passes through the gap, changes in cost leave the profit-maximising price and output unchanged; firms prefer non-price competition.
Criticism: the theory does not explain how the price at the kink is set, and Stigler (1947) found little evidence of the asymmetric reaction; it explains rigidity rather than determination.
Q1(d) · Theories of Employment, Income and Interest · 10 marks≈ 7 min
IS-LM Model and the Neo-classical Synthesis
What are the fiscal and monetary implications of vertical IS and vertical LM curves?
हिंदी में प्रश्न
ऊर्ध्वाधर आइ० एस० और ऊर्ध्वाधर एल० एम० वक्रों के राजकोषीय और मौद्रिक निहितार्थ क्या होते हैं?
Practise this question Theories of Employment, Income and Interest notes
Model answer
Paper and question: Paper I, Q1(d)
Approach: Explain what makes IS vertical (interest-inelastic investment) and LM vertical (interest-inelastic money demand), and the resulting effectiveness of fiscal and monetary policy in each case.
The effectiveness of policy in the IS-LM model depends on the slopes of the two curves.
Vertical IS: arises when investment (and saving) do not respond to the interest rate (b = 0), as in a deep slump. Income is fixed by autonomous spending and the multiplier, whatever the interest rate. Fiscal policy is fully effective: a rise in G shifts IS right by the full multiplier, and although the interest rate rises, no investment is crowded out. Monetary policy is ineffective: an LM shift lowers r but not income.
Vertical LM: arises when money demand does not depend on the interest rate (h = 0), the classical quantity-theory case. Income is fixed by the money supply, Y = (M/P)/k. Monetary policy is fully effective: income rises by ΔM/k. Fiscal policy is ineffective: a rise in G only raises the interest rate until private investment falls by the same amount (complete crowding out).
Diagram: panel 1: vertical IS with LM shifts changing only r, IS shifts changing Y; panel 2: vertical LM with IS shifts changing only r, LM shifts changing Y.
These are the extreme Keynesian and monetarist cases respectively.
Q1(e) · Price Determination and Theories of Distribution · 10 marks≈ 7 min
Kaldor and Kalecki: Macro Theories of Distribution
Examine Kaldor and Kalecki theory of distribution.
हिंदी में प्रश्न
वितरण की काल्डोर एवं कैलेकी थियोरी का परीक्षण कीजिए।
Practise this question Price Determination and Theories of Distribution notes
Model answer
Paper and question: Paper I, Q1(e)
Approach: Give each theory in two or three sentences with its key equation, then compare their assumptions and conclusions.
Both are post-Keynesian theories in which shares depend on spending and saving, not on marginal productivity.
Kaldor (1955–56): at full employment, with exogenous investment and sp greater than sw, saving adjusts to investment through distribution. The profit share is P/Y = [1/(sp − sw)]·(I/Y) − sw/(sp − sw); a higher investment ratio raises it.
Kalecki (1939, 1954): with excess capacity, firms add a mark-up to prime cost; the ratio of proceeds to prime costs k is the degree of monopoly, and the wage share is ω = 1/[1 + (k − 1)(j + 1)], where j is the materials-to-wage-bill ratio. Profits equal capitalists' investment plus consumption, while market power decides the shares.
Comparison: Kaldor assumes full employment and flexible prices, so distribution adjusts to demand; Kalecki assumes excess capacity and administered prices, so output adjusts to demand and distribution reflects market power.
Criticism: Kaldor's full-employment assumption is unrealistic; Kalecki's k is hard to measure and near-tautological; Pasinetti (1962) refined Kaldor by letting workers own capital.

Question 2 (50 marks)

Q2(a) · Theories of Employment, Income and Interest · 20 marks≈ 14 min
New Classical and New Keynesian Macroeconomics
"The advent of New Classical Macro-economics has tended to upset the apple-cart of Keynesian and to a great extent, that of the Monetarists." Discuss.
हिंदी में प्रश्न
"नव क्लासिकी समष्टि-अर्थशास्त्र के आगमन ने कीन्सवादियों और काफी हद तक मुद्रावादियों की स्थिति को डाँवाडोल कर दिया है।" चर्चा कीजिए।
Practise this question Theories of Employment, Income and Interest notes
Model answer
Paper and question: Paper I, Q2(a)
Approach: Explain the new classical ideas (rational expectations, market clearing, Lucas supply, Lucas critique, policy ineffectiveness, time inconsistency, Ricardian equivalence, real business cycles) and show how each undermined Keynesian activism and the monetarist adaptive-expectations framework; end with the new Keynesian response.
New classical macroeconomics emerged in the 1970s with Robert Lucas, Thomas Sargent, Neil Wallace and Robert Barro, after the stagflation that orthodox Keynesianism could not explain.
Core ideas: (i) rational expectations (Muth, 1961): agents use all relevant information and make no systematic errors; (ii) continuous market clearing with flexible prices; (iii) the Lucas supply function Y = Yn + β(P − Pᵉ): output deviates from its natural level only because of price surprises.
Upsetting the Keynesians: (i) the policy ineffectiveness proposition (Sargent and Wallace, 1975): anticipated demand policy changes only prices, so fine-tuning is futile; (ii) the Lucas critique (1976): parameters of large Keynesian econometric models change when policy changes, so they cannot evaluate policy; (iii) Ricardian equivalence (Barro, 1974): debt-financed tax cuts do not raise demand; (iv) time inconsistency (Kydland and Prescott, 1977): discretion produces an inflation bias, so rules are better; (v) real business cycle theory (Kydland and Prescott, 1982): cycles are efficient responses to technology shocks, with no role for demand management; (vi) involuntary unemployment, Keynes' central concept, is denied.
Upsetting the monetarists: Friedman accepted a short-run trade-off because expectations adapt slowly; with rational expectations there is no systematic trade-off even in the short run, so the monetarist case for gradual disinflation and for the costs of fighting inflation weakens: a credible announcement could lower inflation at little cost. The stability of money demand, central to monetarism, also became secondary, and RBC theory denied that money matters at all for cycles.
Diagram: expectations-augmented Phillips curves: under adaptive expectations the economy moves along a short-run curve before the curve shifts; under rational expectations an anticipated policy shifts the curve immediately, so the economy moves vertically along the long-run curve at uₙ.
Response: new Keynesians (Fischer, 1977; Taylor, 1980; Mankiw, 1985) accepted rational expectations but showed that wage and price stickiness restore a role for stabilisation; the evidence of costly disinflation (Volcker, 1979–82) and persistent unemployment also cut against strict market clearing.
Q2(b) · Market Structures · 15 marks≈ 11 min
Oligopoly: Kinked Demand, Collusion, Price Leadership and Game Theory
Write on Prisoners' dilemma and Nash equilibrium.
हिंदी में प्रश्न
प्रिज़नर्स दुविधा और नैश साम्यावस्था पर लिखिए।
Practise this question Market Structures notes
Model answer
Paper and question: Paper I, Q2(b)
Approach: Define Nash equilibrium and dominant strategy, set out the prisoners' dilemma with a payoff matrix, show that the Nash equilibrium is Pareto-inferior, and apply it to oligopoly.
Nash equilibrium (John Nash, 1950) is a combination of strategies in which each player's strategy is the best response to the strategies of the others, so no player can gain by changing strategy unilaterally. A dominant strategy is one that is best whatever the rival does.
Prisoners' dilemma (devised by Flood and Dresher in 1950, named by Tucker): two suspects are questioned separately. If both stay silent, each gets 1 year; if both confess, 5 years each; if only one confesses, he goes free and the other gets 10 years.
Diagram: a 2 × 2 matrix with rows for A (Silent, Confess) and columns for B (Silent, Confess); payoffs in years: (1, 1), (10, 0), (0, 10), (5, 5); arrows show that each player moves to Confess; the Nash cell (5, 5) is circled.
Solution: whatever B does, A is better off confessing (0 is less than 1, and 5 is less than 10), so confessing is a dominant strategy for both. The unique Nash equilibrium is (Confess, Confess) with 5 years each, although (Silent, Silent) would give both only 1 year. The Nash outcome is therefore Pareto-inferior: individual rationality leads to collective irrationality.
Oligopoly application: replace 'stay silent' with 'keep to the cartel price or quota' and 'confess' with 'cheat'. Each firm's dominant strategy is to cut price or exceed its quota, so cartels tend to collapse to the competitive or Cournot outcome; advertising wars and arms races follow the same logic.
Escape: in repeated games, tit-for-tat (Axelrod, 1984) or trigger strategies can sustain cooperation.
Q2(c) · Money and Monetary Management · 15 marks≈ 11 min
Quantity Theories of Money: Fisher, Cambridge (Pigou) and Friedman
Discuss in brief Friedman's restatement of the quantity theory of money and find its similarity/difference with the classical quantity theory.
हिंदी में प्रश्न
मुद्रा की परिमाण थियोरी के फ्रीडमैन के पुनःकथन का संक्षिप्त वर्णन कीजिए तथा क्लासिकी परिमाण थियोरी से इसकी समानता/असमानता बताइए।
Practise this question Money and Monetary Management notes
Model answer
Paper and question: Paper I, Q2(c)
Approach: Outline Friedman's money demand function briefly, then list the similarities with the classical theory (money drives nominal income, stable velocity, long-run neutrality) and the differences (asset theory, variable velocity, short-run output effects, no full-employment assumption).
Restatement: Friedman (1956) treated the quantity theory as a theory of the demand for money. Wealth holders choose among money, bonds, equities, physical goods and human capital; real money demand depends on permanent income, the non-human/human wealth ratio, the yields on alternative assets including expected inflation, and tastes: M/P = f(yₚ, w, r_b, r_e, πᵉ, u). The function is stable and has a low interest elasticity.
Similarities with the classical theory: (i) money is the main determinant of nominal income, and in the long run of the price level; (ii) the relation between money and spending is stable, so velocity is predictable; (iii) money is neutral in the long run; (iv) the policy conclusion favours controlling money growth.
Differences: (i) Fisher's theory is a mechanical identity with constant V and T, while Friedman's is a behavioural theory of money demand derived from portfolio choice; (ii) velocity is not constant but a stable function of a few variables; (iii) the classical theory assumes full employment, so money affects only prices, whereas Friedman allows money to affect output in the short run, with long and variable lags; (iv) Friedman uses permanent income and includes interest rates and expected inflation; (v) the transmission mechanism works through a broad range of assets.
Diagram: velocity over time: constant in the classical view, varying but predictable (tracking interest rates and expected inflation) in Friedman's.
Friedman's version is thus a more general theory that yields the classical result as a long-run special case.

Question 3 (50 marks)

Q3(a) · Theories of Employment, Income and Interest · 20 marks≈ 14 min
New Classical and New Keynesian Macroeconomics
Distinguish between Monetarist and Neo-Keynesian approaches to expectation-augmented Phillips curve.
हिंदी में प्रश्न
प्रत्याशा-संवर्धित फिलिप्स वक्र के मुद्रावादी एवं नव-कीन्सवादी उपागमों में अन्तर कीजिए।
Practise this question Theories of Employment, Income and Interest notes
Model answer
Paper and question: Paper I, Q3(a)
Approach: State the expectations-augmented Phillips curve, then contrast the monetarist version (Friedman-Phelps: adaptive expectations, natural rate, vertical long run, no permanent trade-off, passive rules) with the neo-Keynesian version (slow adjustment from rigidities, NAIRU, possible long-run trade-off or hysteresis, active policy).
The original Phillips curve (A.W. Phillips, 1958) showed an inverse relation between wage inflation and unemployment in the UK. The expectations-augmented Phillips curve adds expected inflation: π = πᵉ − α(u − uₙ).
Monetarist approach (Friedman, 1968; Phelps, 1967): (i) workers bargain over real wages, so expected inflation enters one-for-one (coefficient 1); (ii) expectations are adaptive, πᵉₜ = πᵉₜ₋₁ + λ(πₜ₋₁ − πᵉₜ₋₁); (iii) an expansion lowers unemployment below the natural rate only temporarily, while actual inflation exceeds expected; as expectations catch up, the short-run curve shifts up and unemployment returns to uₙ at higher inflation (the accelerationist hypothesis); (iv) the long-run Phillips curve is vertical at uₙ, determined by real factors; (v) policy should follow a stable rule (k per cent money growth), and disinflation should be gradual.
Neo-Keynesian approach (Tobin, Solow, Modigliani and Papademos, Gordon): (i) accepts expectations but stresses slow adjustment because of wage contracts, price rigidity and inertia, so the short-run trade-off is exploitable for a significant time; (ii) early estimates found the expectations coefficient less than 1, implying a steep but not vertical long-run curve (later evidence favoured near-verticality); (iii) the equilibrium rate is the NAIRU (Modigliani and Papademos, 1975), which may itself depend on demand through hysteresis; (iv) supply shocks shift the curve (Gordon's triangle model); (v) active demand management and incomes policies can reduce the cost of disinflation.
Diagram: unemployment on the horizontal axis and inflation on the vertical; short-run curves SRPC₁ (πᵉ = 2%) and SRPC₂ (πᵉ = 4%); monetarist vertical LRPC at uₙ; neo-Keynesian LRPC steep and negatively sloped (or uₙ shifting with past unemployment).
Key differences: nature of expectations (adaptive in both, but neo-Keynesians emphasise inertia), speed of adjustment, existence of a long-run trade-off, and policy activism. Rational expectations later removed even the monetarist short-run trade-off for anticipated policy.
Q3(b) · Money and Monetary Management · 15 marks≈ 11 min
Goals and Instruments of Monetary Policy in Closed and Open Economies
Should inflation targeting be main plank of monetary policy of a central bank in emerging market economies like India? Show its implications on investment and growth.
हिंदी में प्रश्न
क्या भारत जैसी उभरती हुई बाज़ार अर्थव्यवस्था में मुद्रास्फीति पर प्रहार केन्द्रीय बैंकों की मौद्रिक नीति का मुख्य कार्य होना चाहिए? निवेश एवं आर्थिक संवृद्धि पर इसके निहितार्थों को दर्शाइए।
Practise this question Money and Monetary Management notes
Model answer
Paper and question: Paper I, Q3(b)
Approach: Explain inflation targeting and India's flexible version, argue for it in EMEs (credibility, anchoring, poverty) and against (supply shocks, food weight, exchange-rate and growth concerns), then analyse the short-run and long-run effects on investment and growth and conclude with flexible IT.
Inflation targeting commits the central bank to a numerical inflation target pursued through its policy rate. India adopted flexible inflation targeting by amending the RBI Act in 2016, after the Urjit Patel Committee (2014): 4 per cent CPI inflation within 2–6 per cent, set by a six-member Monetary Policy Committee.
Case for EMEs like India: (i) inflation hurts the poor most; (ii) a clear target anchors expectations and gives credibility after periods of high inflation (around 10 per cent in 2010–13); (iii) it reduces discretion and fiscal dominance; (iv) Indian CPI inflation averaged lower and was more stable after 2016.
Concerns: (i) food and fuel supply shocks, which monetary policy cannot control, carry a large weight in CPI; (ii) exchange-rate volatility and capital flows may require attention to other goals; (iii) weak transmission through banks; (iv) a narrow focus may neglect growth, employment and financial stability.
Implications for investment and growth: in the short run, raising rates to meet the target increases the cost of capital and lowers investment and output (the sacrifice ratio); critics argued that high real rates in 2015–19 hurt investment. In the long run, low and stable inflation lowers uncertainty and risk premia, raises financial saving and lengthens planning horizons, which supports investment and growth; there is no long-run trade-off if the Phillips curve is vertical.
Diagram: AD-AS: a contractionary policy shifts AD left, lowering inflation and output temporarily; over time expectations adjust, SRAS shifts down and output returns to potential at lower inflation.
Q3(c) · Welfare Economics · 15 marks≈ 11 min
Market Failure: Externalities, Public Goods and Asymmetric Information
What is a Lemon Market? What is the role of signalling and screening in it? Explain.
हिंदी में प्रश्न
लेमन बाज़ार से क्या तात्पर्य है? इसमें संकेतन और छानबीन की क्या भूमिका है? समझाइए।
Practise this question Welfare Economics notes
Model answer
Paper and question: Paper I, Q3(c)
Approach: Explain Akerlof's lemons model with the adverse-selection unravelling, then signalling (Spence) and screening (Stiglitz) as market responses, with examples.
A lemon market (George Akerlof, 'The Market for Lemons', Quarterly Journal of Economics, 1970) is one in which sellers know the quality of a product but buyers do not, as in used cars, where a bad car is a 'lemon'.
Mechanism: suppose good cars are worth ₹4 lakh and lemons ₹2 lakh to buyers, in equal numbers. Unable to tell them apart, buyers offer only the average, ₹3 lakh. Owners of good cars, who value them above ₹3 lakh, withdraw; the share of lemons rises, buyers lower their offer further, and in the limit only lemons are traded. This is adverse selection: bad quality drives out good, and mutually beneficial trades in good cars do not occur.
Signalling (Michael Spence, 1973): the informed side takes a costly action that low-quality types find too expensive to imitate, so it credibly reveals quality. Examples: warranties and certified pre-owned programmes for cars, educational degrees for workers (Spence's job-market model), brand reputation.
Screening (Joseph Stiglitz; Rothschild and Stiglitz, 1976): the uninformed side designs a menu of contracts that makes different types sort themselves. Examples: insurers offering low-premium/high-deductible and high-premium/low-deductible policies; banks using collateral requirements; employers using probation periods.
Diagram: a supply curve of used cars rising with price (average quality rises with price) and a demand curve that depends on expected quality; as price falls, average quality falls and demand shifts down, the market shrinking towards only lemons.
Akerlof, Spence and Stiglitz shared the 2001 Nobel prize; in India, certified used-car platforms and the Insurance Regulatory and Development Authority's disclosure norms are applications.

Question 4 (50 marks)

Q4(a) · Welfare Economics · 20 marks≈ 14 min
Market Failure: Externalities, Public Goods and Asymmetric Information
What is asymmetric information? How could it lead to adverse selection and market failure? Discuss.
हिंदी में प्रश्न
असममित सूचना क्या होती है? यह किस प्रकार घटिया चयन एवं बाज़ार असफलता की स्थिति उत्पन्न कर सकती है? विवेचना कीजिए।
Practise this question Welfare Economics notes
Model answer
Paper and question: Paper I, Q4(a)
Approach: Define asymmetric information, distinguish adverse selection (hidden type, before the contract) from moral hazard (hidden action, after), show with the lemons and insurance examples how markets fail, and discuss remedies.
Asymmetric information exists when one party to a transaction knows something relevant that the other does not: sellers know product quality, borrowers know their riskiness, the insured know their health. Standard welfare theorems assume full information, so asymmetry can make competitive outcomes inefficient.
Adverse selection (hidden characteristics, before the contract): the uninformed side cannot distinguish types and offers an average price, which attracts the worst types and drives away the best. In Akerlof's (1970) used-car market, good cars are withdrawn because buyers pay only for average quality; the market shrinks and may collapse to lemons only.
Insurance example: if an insurer charges a premium based on average risk, low-risk people find it too expensive and drop out, while high-risk people buy; average claims rise, the premium is raised, more low-risk people leave, and the market may unravel (a 'death spiral'). In credit markets, Stiglitz and Weiss (1981) showed that raising interest rates attracts riskier borrowers, so banks ration credit instead of raising rates.
Moral hazard (hidden action, after the contract): once insured or financed, people take less care because they do not bear the full cost, e.g. reckless driving after full insurance or risky lending by banks expecting a bail-out.
Diagram: insurance market with premium on the vertical and coverage on the horizontal axis; demand from high-risk buyers above that of low-risk buyers; an average-risk premium line above the low-risk willingness to pay, showing low-risk buyers dropping out.
Remedies: (i) signalling and screening (warranties, deductibles, collateral); (ii) mandatory pooling: compulsory or group insurance, as in Ayushman Bharat–PMJAY (2018) or employer health cover, which keeps low risks in the pool; (iii) disclosure regulation and credit bureaus (CIBIL) that reduce information gaps; (iv) co-payments and monitoring against moral hazard.
Asymmetric information is thus a major source of market failure, but appropriate institutions can restore much of the lost efficiency.
Q4(b) · Economic Development · 15 marks≈ 11 min
Development and Environmental Sustainability
Illustrate the notion of perverse subsidy in the context of natural resource sector.
हिंदी में प्रश्न
प्राकृतिक संसाधन क्षेत्र के सन्दर्भ में अनिष्टकर सब्सिडि की अवधारणा की व्याख्या कीजिए।
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q4(b)
Approach: Define perverse subsidies (Myers and Kent), then illustrate them in natural-resource sectors (water and power for irrigation, fertiliser, fisheries, fossil fuels, forestry, mining), with the mechanism and Indian examples, and suggest reform.
Perverse subsidies (Norman Myers and Jennifer Kent, 2001) are subsidies that harm both the economy and the environment: they lower the private cost of using a resource below its social cost, encouraging over-use and depletion.
Illustrations: (i) irrigation power and water: free or flat-rate electricity and canal water priced far below cost in India encourage over-pumping and water-intensive crops; groundwater tables have fallen sharply in Punjab and Haryana, and the zero marginal cost removes any incentive to save water; (ii) fertiliser: the much larger subsidy on urea than on phosphate and potash has distorted the N:P:K ratio, degrading soils and polluting water; (iii) fisheries: fuel and boat subsidies expand fleets beyond sustainable catch, which the WTO's 2022 Agreement on Fisheries Subsidies seeks to curb; (iv) fossil fuels: consumer subsidies on diesel, kerosene and LPG encourage consumption and emissions; (v) forests and minerals: royalties set below scarcity value and cheap leases accelerate extraction.
Diagram: a subsidy shifts the private cost of the resource down below marginal social cost, raising use from the efficient level to a higher level; the gap is over-exploitation.
Reform involves pricing resources closer to cost, replacing input subsidies with direct income support, metering power and water, and redirecting savings to conservation, as attempted through solar pumps under PM-KUSUM and Punjab's 'Paani Bachao, Paisa Kamao' pilot.
Q4(c) · Public Finance · 15 marks≈ 11 min
Public Expenditure: Growth Theories and Effects
Examine the effects of public expenditure on the development process of an economy.
हिंदी में प्रश्न
किसी अर्थव्यवस्था के विकास प्रक्रम में सार्वजनिक व्यय के प्रभावों का परीक्षण कीजिए।
Practise this question Public Finance notes
Model answer
Paper and question: Paper I, Q4(c)
Approach: Use Dalton's classification of the effects of public expenditure (on production, distribution and stability) and link each to the development process, with examples and limits.
Public expenditure is a key instrument of development in less developed countries, where markets fail to provide infrastructure, human capital and the 'big push'. Hugh Dalton classified its effects into effects on production, on distribution and on economic stability.
Effects on production: spending raises (i) the ability to work, save and invest, through health, education, housing and social security; (ii) the willingness to work and save, provided transfers do not blunt incentives; and (iii) the allocation of resources towards growth sectors, through infrastructure, irrigation, power, research and support to industry. Social overhead capital, as Hirschman argued, lowers costs for directly productive activities and crowds in private investment.
Effects on distribution: progressive spending on food security, public health, education and rural employment raises the real income of the poor and reduces inequality, which widens the domestic market and builds human capital.
Effects on stability and structure: counter-cyclical spending stabilises output and employment; public investment can also change the structure of the economy, as India's Second Five Year Plan (Mahalanobis model) built heavy industry through the public sector.
Limits: spending financed by large deficits can cause inflation and crowd out private investment; poor targeting, leakages and the dominance of salaries, subsidies and interest reduce its developmental impact. Hence the quality and composition of spending matter: capital and social spending have the largest effect on development.

Question 5 (50 marks)

Q5(a) · Theories of International Trade · 10 marks≈ 7 min
Product Cycle, New Trade Theory and Strategic Trade Policy
Differentiate between inter-industry and intra-industry trade. Can standard H-O model explain intra-industry trade? Discuss.
हिंदी में प्रश्न
अन्तर-उद्योग एवं आन्तरिक-उद्योग के बीच विभेदन कीजिए। क्या मानक हेक्शर-ओलिन मॉडल आन्तरिक-उद्योग की व्याख्या कर सकता है? चर्चा कीजिए।
Practise this question Theories of International Trade notes
Model answer
Paper and question: Paper I, Q5(a)
Approach: Define inter- and intra-industry trade (with the Grubel-Lloyd index), then explain why the standard H-O model cannot explain intra-industry trade and which theories do.
Inter-industry trade is the exchange of different products, reflecting comparative advantage. Intra-industry trade is the simultaneous export and import of products of the same industry, such as cars exported by Germany to France and imported from France. It is measured by the Grubel-Lloyd index (1975): IIT = 1 − |X − M|/(X + M), which equals 1 when exports and imports of an industry are equal.
The standard H-O model cannot explain it, because it assumes homogeneous goods, perfect competition and constant returns: a country exports goods intensive in its abundant factor and imports others, so it would not both export and import the same good. Similar countries, with similar endowments, should trade little, yet they trade most.
Intra-industry trade is explained by product differentiation, economies of scale and monopolistic competition (Krugman, 1979; Helpman and Krugman, 1985), by reciprocal dumping in oligopoly (Brander and Krugman, 1983), and partly by aggregation of different goods in one category.
Some variants allow H-O to explain 'vertical' intra-industry trade in different qualities.
Q5(b) · Economic Development · 10 marks≈ 7 min
Trade, Foreign Investment and Multinationals in Development
Explain Dunning's eclectic theory of FDI.
हिंदी में प्रश्न
विदेशी प्रत्यक्ष निवेश की डनिंग की संकलनवादी थियोरी की व्याख्या कीजिए।
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q5(b)
Approach: Explain Dunning's OLI paradigm: the three conditions (ownership, location, internalisation) and what each explains, with an example.
John Dunning's eclectic theory (1977) combines earlier theories to explain why, where and how firms undertake foreign direct investment. FDI occurs only when three conditions, the OLI advantages, are present together.
Ownership (O) advantages: firm-specific assets such as technology, patents, brands, management and scale that allow a foreign firm to compete with local firms abroad (the 'why'). Location (L) advantages: features of the host country such as cheap labour, resources, market size and tariffs that make it better to produce there rather than export (the 'where').
Internalisation (I) advantages: the gains from exploiting the ownership advantage within the firm rather than through licensing or contracts, because of imperfect markets for knowledge, risk of imitation and the need for quality control (the 'how').
If L is absent the firm exports, and if I is absent it licenses its advantage. For example, Suzuki invested in India in the 1980s because it had technology (O), India offered a large protected market (L), and it preferred to control production (I).
Q5(c) · Theories of International Trade · 10 marks≈ 7 min
Product Cycle, New Trade Theory and Strategic Trade Policy
Explain Brander-Krugman model of intra-industry trade in an oligopolistic market.
हिंदी में प्रश्न
अल्पाधिकारी बाज़ार में ब्रैंडर-क्रुगमैन के आन्तरिक-उद्योग मॉडल की व्याख्या कीजिए।
Practise this question Theories of International Trade notes
Model answer
Paper and question: Paper I, Q5(c)
Approach: Explain the Brander-Krugman reciprocal dumping model: Cournot duopoly in two markets, segmented markets, transport costs, why two-way trade in identical goods occurs, and its welfare effects.
James Brander and Paul Krugman ('A Reciprocal Dumping Model of International Trade', 1983) showed that oligopolistic rivalry alone can generate intra-industry trade in identical products.
Model: one firm in each of two countries produces the same good with the same constant marginal cost; markets are segmented, so each firm chooses separate quantities for the home and foreign markets; firms compete à la Cournot; exporting involves a transport cost.
Each firm earns a price above marginal cost in its rival's market, so even after paying transport costs it profits from selling a small quantity there. Because it ignores the effect of extra sales abroad on its home price, each firm sells abroad at a lower net price than at home, i.e. it 'dumps'. Both firms do this, so the same good is shipped in both directions: reciprocal dumping.
Welfare: trade increases competition, lowers prices and raises output; but transport costs are wasted on cross-hauling, so welfare may rise or fall, rising when transport costs are low.
Q5(d) · Economic Development · 10 marks≈ 7 min
Myrdal, Kuznets and Structural Change; Role of Agriculture
Explain Kuznets' inverted 'U' hypothesis. Is growth good for the poor? Explain.
हिंदी में प्रश्न
कुजनेट्स की व्युत्क्रमित 'यू' परिकल्पना को समझाइए। क्या संवृद्धि गरीबों के लिए हितकर होती है? बताइए।
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q5(d)
Approach: Explain the inverted U briefly, then answer whether growth is good for the poor using evidence (Dollar and Kraay) and the role of inequality and pattern of growth.
Kuznets's inverted U (1955) holds that inequality rises in the early stages of growth, as labour moves from a poor, equal rural sector to a richer, unequal urban sector, and falls later as most workers join the modern sector and education and redistribution spread.
Is growth good for the poor? Broadly yes. Dollar and Kraay ('Growth Is Good for the Poor', 2002) found that on average the incomes of the poorest 20% rise one-for-one with mean income. China and India cut extreme poverty sharply during fast growth.
But the effect depends on initial inequality and the pattern of growth: growth in labour-intensive sectors and agriculture reduces poverty more than capital-intensive or enclave growth, and high inequality lowers the poverty-reducing power of growth.
Hence growth is necessary for poverty reduction, and becomes 'pro-poor' when combined with human capital, jobs and social protection.
Q5(e) · Economic Development · 10 marks≈ 7 min
Myrdal, Kuznets and Structural Change; Role of Agriculture
Under what conditions economic growth reduces employment growth? Discuss.
हिंदी में प्रश्न
किन दशाओं में आर्थिक संवृद्धि, रोज़गार संवृद्धि को कम कर देती है? विवेचना कीजिए।
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q5(e)
Approach: Use the identity (employment growth = output growth − labour productivity growth) and list the conditions under which growth reduces employment growth, with Indian illustration.
Employment growth equals output growth minus the growth of labour productivity, and the ratio of the two growth rates is the employment elasticity of output. Growth reduces employment growth, giving 'jobless growth', when productivity rises faster than output.
Conditions: (i) capital-intensive or labour-saving technology, including automation; (ii) a shift in output composition towards capital- or skill-intensive sectors such as finance, IT and petrochemicals, and away from agriculture and labour-intensive manufacturing; (iii) relative factor prices biased against labour: subsidised credit and capital goods, or wage and labour-law rigidities that make hiring costly; (iv) restructuring after liberalisation, when firms shed surplus labour to compete; (v) growth led by a few large firms or enclaves with weak linkages.
India's employment elasticity fell in the 2000s, when GDP grew fast but organised manufacturing employment grew slowly.
Remedies include promoting labour-intensive sectors such as textiles, food processing and tourism, supporting MSMEs, and building skills.

Question 6 (50 marks)

Q6(a) · Theories of Growth · 20 marks≈ 14 min
Neo-classical (Solow) and Endogenous Growth: Human Capital and R&D
Describe the growth path, which once the economy attains it, will give a higher level of per capita consumption than any other growth path for all time.
हिंदी में प्रश्न
संवृद्धि के उस पथ का वर्णन कीजिए, जिसे अर्थव्यवस्था द्वारा एक बार प्राप्त कर लेने पर यह किसी अन्य संवृद्धि पथ के मुकाबले सदैव प्रति व्यक्ति उपभोग का उच्चतर स्तर प्राप्त करता है।
Practise this question Theories of Growth notes
Model answer
Paper and question: Paper I, Q6(a)
Approach: Identify the path as the golden rule of accumulation (Phelps, 1961), derive its condition in the Solow model, give the Cobb-Douglas saving rate, draw the diagram and discuss dynamic inefficiency and the transition.
The path described is the golden rule growth path, named by Edmund Phelps in 'The Golden Rule of Accumulation: A Fable for Growthmen' (1961): among all balanced growth paths, the one with the highest consumption per worker for all time. Each saving rate gives a different steady state in the Solow model, and the golden rule picks the best.
Model: y = f(k) with f′ greater than 0 and f″ less than 0; capital per worker evolves as k̇ = sf(k) − (n + δ)k; in the steady state sf(k*) = (n + δ)k*.
Derivation: steady-state consumption per worker is c* = (1 − s)f(k*) = f(k*) − (n + δ)k*. Maximising with respect to k* gives f′(k_gold) = n + δ; the second-order condition f″ less than 0 confirms a maximum. With labour-augmenting progress at rate g, the condition becomes f′(k) = n + g + δ. In words, the net marginal product of capital, f′ − δ, equals the natural growth rate.
Cobb-Douglas case: with y = k^α, the golden-rule saving rate equals the capital share: s_gold = α, so all profits are saved and all wages consumed, the 'neoclassical theorem' discussed by Phelps, Joan Robinson and von Weizsäcker.
Diagram: f(k) and the ray (n + δ)k against k; consumption per worker is the vertical distance between them; draw a tangent to f(k) parallel to the ray; the tangency point gives k_gold and the largest gap c_gold; the saving curve s_gold·f(k) cuts the ray at that k.
If the economy has more capital than k_gold it is dynamically inefficient: reducing saving raises consumption now and in every future period. If it has less, moving to the golden rule raises steady-state consumption but requires lower consumption during the transition, so a society that discounts the future (as in the Ramsey model's modified golden rule, f′(k) = n + δ + ρ) will choose slightly less capital. Abel, Mankiw, Summers and Zeckhauser (1989) found that the US economy was dynamically efficient.
Q6(b) · Theories of International Trade · 15 marks≈ 11 min
Comparative Advantage: Ricardo and Heckscher-Ohlin
"Technical progress in capital-intensive sector almost invariably reduces the real wage rate and increases the real return to capital. Technical progress in labour-intensive sector will lead to increase in real wage rate and decrease in the real return to capital." Explain.
हिंदी में प्रश्न
"पूँजीप्रधान क्षेत्रक में तकनीकी विकास लगभग सदैव ही वास्तविक मजदूरी दर में कमी और पूँजी के वास्तविक प्रतिफल में वृद्धि करता है। श्रमप्रधान क्षेत्रक में तकनीकी प्रगति वास्तविक मजदूरी दर में वृद्धि एवं वास्तविक पूँजी प्रतिफल में कमी करती है।" समझाइए।
Practise this question Theories of International Trade notes
Model answer
Paper and question: Paper I, Q6(b)
Approach: Use the 2×2 H-O model with given goods prices (small economy): explain via the zero-profit conditions (Findlay-Grubert) how neutral technical progress in one sector changes factor rewards, with the Lerner-Pearce or unit-cost diagram, and the role of bias.
This is the result of Findlay and Grubert (1959), derived in the two-good, two-factor model with given commodity prices (a small open economy) and perfect competition, where price equals unit cost in each sector.
Mechanism: technical progress in the capital-intensive sector lowers its unit cost, so at the given price it earns profits and expands, drawing resources from the labour-intensive sector. The capital-intensive sector demands relatively more capital and less labour than the labour-intensive sector releases, so the rental on capital rises and the wage falls until zero profits are restored in both sectors. As in the Stolper-Samuelson theorem, the effect is magnified: the factor used intensively in the progressing sector gains in real terms, the other loses. Symmetrically, progress in the labour-intensive sector raises the real wage and lowers the real return to capital.
Diagram: unit-cost curves in (w, r) space for the two sectors (the price-equals-cost loci); progress in sector X shifts its curve outwards; the intersection moves to a higher r and lower w when X is capital-intensive.
'Almost invariably' because the result holds for neutral and for labour-saving progress; if progress in the capital-intensive sector is strongly capital-saving, it reduces that sector's demand for capital and the outcome can be reversed. If goods prices change (a large country), the terms-of-trade effect also matters.
The result explains why productivity growth in sectors such as electronics benefits capital, while growth in labour-intensive sectors benefits workers.
Q6(c) · Trade Policy, Protection and the WTO · 15 marks≈ 11 min
GATT and WTO: Rounds, TRIMs, TRIPS and Domestic Measures
What is the stalemate in the WTO about subsidies in less-developed economies? Discuss.
हिंदी में प्रश्न
कम विकसित अर्थव्यवस्था में सब्सिडि के मुद्दे पर विश्व व्यापार संगठन में क्या गतिरोध है? विवेचना कीजिए।
Practise this question Trade Policy, Protection and the WTO notes
Model answer
Paper and question: Paper I, Q6(c)
Approach: Explain the Agreement on Agriculture's subsidy rules (boxes, AMS, de minimis), the conflict over public stockholding for food security and MSP (external reference price of 1986–88), the Bali peace clause and the stalemate, with India's position.
The WTO Agreement on Agriculture (1995) classifies domestic support into boxes: the Amber Box (trade-distorting support such as market price support and input subsidies, limited by the Aggregate Measurement of Support), the Green Box (minimally distorting support such as research, extension and decoupled income support, not limited) and the Blue Box (production-limiting payments). Developing countries may give Amber Box support up to a de minimis 10% of the value of production.
The stalemate: India and other developing countries buy food grains at administered minimum support prices for public stocks and distribution under the National Food Security Act, 2013. Under the rules, market price support is calculated as (administered price − fixed external reference price of 1986–88) × eligible production. Because the reference price is outdated and ignores inflation, support for rice and wheat can appear to exceed the 10% limit. Developing countries (the G-33) want public stockholding for food security exempted or the calculation updated; exporters fear that releases from such stocks distort trade.
Peace clause: the Bali Ministerial (2013) agreed an interim peace clause shielding such programmes from legal challenge until a permanent solution; in November 2014 the General Council made it indefinite. India became the first country to invoke it, for rice, in 2020 (for marketing year 2018–19). No permanent solution has been agreed at later ministerials.
The stalemate thus reflects a clash between food security and trade-distortion concerns.

Question 7 (50 marks)

Q7(a) · Theories of International Trade · 20 marks≈ 14 min
Trade as an Engine of Growth and Theories of Underdevelopment
"The argument that export-biased growth may turn the terms of trade unfavourable to the country and hence may not be beneficial, is applicable in the case of a large country and not a small country." Explain.
हिंदी में प्रश्न
"यह तर्क कि हो सकता है कि निर्यात-अभिनत संवृद्धि देश के व्यापार शर्तों को प्रतिकूल कर दे अतः देश के लिए हितकर नहीं है, बड़े देशों के संदर्भ में न कि छोटे देशों के संदर्भ में, लागू होता है।" स्पष्ट कीजिए।
Practise this question Theories of International Trade notes
Model answer
Paper and question: Paper I, Q7(a)
Approach: Explain the terms-of-trade effect of export-biased growth, show why a small country (price taker) always gains while a large country can lose (immiserising growth), with a diagram, and note qualifications.
Export-biased growth increases the output of a country's export good more than proportionately, so at constant prices its offer of exports and demand for imports rise. Whether this harms the country depends on whether it can affect world prices.
Small country: a small country is a price taker; its extra exports do not change world prices, so its terms of trade are unchanged. Growth shifts its PPF outward and, at the same world price line, it reaches a higher indifference curve. Growth is therefore always beneficial, whatever its bias.
Large country: a large country's extra exports lower the world price of its export good (and raise the price of imports), so its terms of trade deteriorate. If the deterioration is large enough, the loss can outweigh the gain from growth: Bhagwati's (1958) immiserising growth. This requires strongly export-biased growth, price-inelastic foreign demand for its exports and high dependence on trade. In Harry Johnson's classification, ultra-pro-trade-biased growth is the most likely to worsen the terms of trade.
Diagram: a PPF shifting out mainly along the export axis; for a small country the same price line touches the new PPF and gives consumption on a higher indifference curve; for a large country the price line becomes flatter, and consumption can fall to a lower indifference curve.
Thus the statement is correct: the terms-of-trade argument applies only to large countries. Qualifications: a group of small countries expanding the same export together (for example, many tropical producers of coffee or cocoa) can collectively act like a large country; and even a large country can avoid the loss through an optimal export tax or diversification.
Q7(b) · Balance of Payments and Exchange Rates · 20 marks≈ 14 min
Policy Mix: Swan Diagram, Mundell's Assignment and Mundell-Fleming
With the help of Salter-Swan diagram, define the zones of disequilibrium and assign policy prescriptions for the situations pertaining to unemployment and inflation vis-à-vis BOP deficit.
हिंदी में प्रश्न
साल्टर-स्वैन रेखाचित्र की सहायता से किसी अर्थव्यवस्था के असंतुलन के क्षेत्रों को परिभाषित कीजिए एवं भुगतान-संतुलन के घाटे के साथ-साथ मुद्रास्फीति एवं बेरोज़गारी के क्षेत्रों के संदर्भ में नीतिगत सुझाव दीजिए।
Practise this question Balance of Payments and Exchange Rates notes
Model answer
Paper and question: Paper I, Q7(b)
Approach: Draw the Swan diagram (domestic absorption versus real exchange rate; IB and EB curves), define the four zones, and assign expenditure-changing and expenditure-switching policies to each, especially unemployment with deficit and inflation with deficit.
The Salter-Swan diagram (W.E.G. Salter, 1959; Trevor Swan, 1955) shows how two targets, internal balance (full employment with price stability) and external balance (current account equilibrium), require two instruments: expenditure-changing policy (fiscal and monetary, which changes domestic absorption) and expenditure-switching policy (the real exchange rate).
Diagram: domestic absorption (real expenditure, A) on the horizontal axis and the real exchange rate e (price of foreign currency; higher e means depreciation) on the vertical. The EB curve slopes upward: more absorption raises imports, so a higher e is needed to keep the current account balanced; points above EB are surpluses, below are deficits. The IB curve slopes downward: a higher e raises net exports and demand, so less absorption is needed for full employment; points to the right of IB show inflation, to the left unemployment. The curves cross at the point of joint balance.
Zones: the two curves create four zones: I (above EB, right of IB): inflation and surplus; II (below EB, right of IB): inflation and deficit; III (below EB, left of IB): unemployment and deficit; IV (above EB, left of IB): unemployment and surplus.
Policy prescriptions: in unemployment with deficit (zone III), the currency is overvalued: the key remedy is depreciation (expenditure switching), which raises net exports and employment; absorption may need to rise or fall depending on the exact position (if the point lies below the joint-balance absorption level, raise absorption; if above, cut it). In inflation with deficit (zone II), excess absorption is the problem: the key remedy is expenditure reduction through fiscal and monetary tightening, combined with depreciation or appreciation depending on whether the point lies above or below the joint-balance exchange rate. Zones I and IV are the mirror images (appreciation with more absorption for unemployment-surplus, appreciation with less absorption for inflation-surplus).
The diagram shows that using one instrument alone, such as devaluation for a deficit, can worsen the other target. It underlies Tinbergen's rule and Mundell's assignment problem; India's 1991 package of devaluation plus fiscal correction applied this logic.
Q7(c) · Theories of Growth · 10 marks≈ 7 min
Balanced and Unbalanced Growth: Rosenstein-Rodan, Nurkse and Hirschman
To counteract under-development stagnation, discuss Leibenstein's critical minimum effort theory.
हिंदी में प्रश्न
अल्पविकास गतिहीनता के निराकरण हेतु लाइबेन्स्टीन के न्यूनतम क्रान्तिक प्रयास सिद्धान्त का विवेचन कीजिए।
Practise this question Theories of Growth notes
Model answer
Paper and question: Paper I, Q7(c)
Approach: Explain Leibenstein's theory: income-depressing versus income-raising forces, the quasi-stable low-level equilibrium, and why a minimum effort above a critical size is needed; mention the diagram.
Harvey Leibenstein (Economic Backwardness and Economic Growth, 1957) argued that backward economies are caught in a quasi-stable equilibrium of low per capita income, and that only a stimulus above a certain critical minimum effort can launch sustained growth.
Any rise in income triggers income-raising forces (more saving and investment, skills, entrepreneurship) and income-depressing forces (population growth, which rises with income up to a point, and consumption of the gains). A small effort is swamped by the depressing forces, especially faster population growth, and income falls back.
Diagram: per capita income on the axes with a curve of next-period income against current income; small displacements return to the low equilibrium, and only a jump beyond the critical point leads to self-sustaining growth.
Hence the initial effort must be large and concentrated, so that at every stage the income-raising forces outweigh the income-depressing ones. Critics note that population growth does not always rise with income and that the critical size cannot be measured; the theory is close to Rosenstein-Rodan's big push.

Question 8 (50 marks)

Q8(a) · Balance of Payments and Exchange Rates · 20 marks≈ 14 min
Balance of Payments Adjustment: Elasticity, Absorption and Monetary Approaches
What are the elasticity and absorption approaches to BOP adjustment? Discuss.
हिंदी में प्रश्न
भुगतान-संतुलन समायोजन के प्रत्यास्थता और अवशोषण उपागम क्या हैं? विवेचना कीजिए।
Practise this question Balance of Payments and Exchange Rates notes
Model answer
Paper and question: Paper I, Q8(a)
Approach: Explain the elasticity approach (Marshall-Lerner, J-curve, limitations) and the absorption approach (B = Y − A, income and absorption effects at less than and at full employment), then their synthesis.
The elasticity approach analyses how a devaluation improves the trade balance through relative price changes. Devaluation lowers the foreign-currency price of exports and raises the domestic-currency price of imports. By the Marshall-Lerner condition, starting from balanced trade with perfectly elastic supplies, the trade balance improves if |ex| + |em| is greater than one; the more general Bickerdike-Robinson-Metzler condition allows for finite supply elasticities.
Diagram: foreign-exchange market with demand (from imports) and supply (from exports) curves; devaluation raises the price of foreign currency; if demand and supply are elastic the gap between them (the deficit) narrows; with inelastic, backward-bending supply it may widen. A time diagram shows the J-curve, since elasticities are low in the short run.
Limitations: it is partial equilibrium, ignores the effect of devaluation on income, absorption and domestic prices, and assumes unemployed resources. Developing countries' elasticities may be low.
The absorption approach (Sidney Alexander, 1952) starts from B = Y − A, where absorption A = C + I + G. The trade balance improves only if income rises relative to absorption: ΔB = (1 − a)ΔY − ΔAd. With unemployment, devaluation raises net exports and income (the income or employment effect), and B improves if the propensity to absorb is below one. At full employment Y cannot rise, so devaluation must reduce absorption directly, through the real-balance effect (higher prices reduce real money holdings), redistribution towards profits and high savers, money illusion or higher taxes; otherwise it merely causes inflation.
Synthesis: the two approaches are complementary (Machlup; Tsiang): devaluation switches expenditure if elasticities are favourable, but sustained improvement requires that absorption falls relative to output, which is why devaluation is usually accompanied by expenditure-reducing fiscal and monetary policies.
Q8(b) · Economic Development · 15 marks≈ 11 min
Development and Environmental Sustainability
"Pollution-income progression of agrarian communities (clean) to industrial economies (pollution intensive) to service economies (cleaner) would appear to be false if pollution increases again at the end due to higher levels of income and consumption of the people at large." Discuss.
हिंदी में प्रश्न
"प्रदूषण-आय वर्धमानता कृषि समुदाय (स्वच्छ) से औद्योगिक अर्थव्यवस्था (प्रदूषण-गहन) से सेवा अर्थव्यवस्था (स्वच्छतर) की मान्यता तब धराशायी हो जाती है जब अधिकांश व्यक्तियों की ऊँची आय तथा उपभोग-स्तर अंत में पुनःप्रदूषण को बढ़ावा देने वाले बन जाते हैं।" विवेचना कीजिए।
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q8(b)
Approach: Explain the EKC (clean agrarian, dirty industrial, cleaner service stages), then show why it may be N-shaped (re-linking through rising consumption, scale effects, carbon, displacement of pollution), with evidence, and conclude.
The statement describes the environmental Kuznets curve (Grossman and Krueger, 1991): pollution rises as an agrarian economy industrialises, then falls as the economy shifts to services, adopts cleaner technology and demands environmental quality, giving an inverted U.
But the progression would be false if pollution rises again at high incomes, making the curve N-shaped. De Bruyn and Opschoor (1997) found such 're-linking' for several rich countries. Reasons: (i) once cheap technical improvements are exhausted, the scale effect of ever-higher output and consumption dominates again; (ii) the rebound effect: efficiency lowers costs and raises use, as with cars, air travel and electronics; (iii) services are not 'weightless': data centres, transport and tourism consume energy; (iv) consumption-based accounting shows rich countries outsourcing pollution to manufacturing exporters, so territorial declines overstate improvement; (v) global pollutants such as carbon dioxide and waste have never followed the inverted U.
Diagram: pollution against income per head: rising, falling after the first turning point, then rising again at very high incomes, an N shape.
Hence the clean-dirty-clean sequence is not automatic; sustained decline needs continuing policy, such as carbon pricing, efficiency standards and sustainable consumption, rather than reliance on income growth.
Q8(c) · Theories of Growth · 15 marks≈ 11 min
Lewis Model of Development with Surplus Labour (and Ranis-Fei)
Indicate the Ricardo legacy which is inherent in the Lewis model of economic development.
हिंदी में प्रश्न
ल्यूइस के आर्थिक विकास मॉडल में रिकार्डो की परम्परा का संकेत कीजिए।
Practise this question Theories of Growth notes
Model answer
Paper and question: Paper I, Q8(c)
Approach: Identify the classical (Ricardian) elements of the Lewis model: subsistence wage and unlimited labour, accumulation from profits, distribution as the engine of growth, and diminishing returns in agriculture and the terms-of-trade limit.
Lewis opened his 1954 paper by saying that he was returning to the classical economists' framework, which assumed an unlimited supply of labour at a subsistence wage, because it fits overpopulated poor countries better than the neoclassical one. Several elements are inherited from David Ricardo.
(i) Subsistence wage and elastic labour supply: as in Ricardo's 'natural price of labour', the wage in the modern sector is tied to a conventional subsistence level, and labour is available in any amount at that wage.
(ii) Accumulation from profits: for Ricardo, capitalists save and invest out of profits while workers consume their wages; Lewis likewise makes the reinvestment of the capitalist surplus the sole engine of growth.
(iii) Distribution drives growth: in both, the share of profits in national income determines the rate of accumulation; Lewis's central problem, raising saving from 5% to 12% of income, is a rise in the profit share.
(iv) Diminishing returns and food prices: Ricardo feared that diminishing returns on land would raise food prices, wages and rents and squeeze profits until accumulation stopped (the stationary state). Lewis similarly warned that if agriculture stagnates, the terms of trade turn against industry, the wage rises and expansion halts before surplus labour is exhausted; this is why agricultural productivity matters.
Thus the Lewis model is a classical growth model applied to dualism, with Ricardo's theory of distribution at its core.

UPSC Mains 2016 Economics Paper II