UPSC Mains 2019 Economics Optional Question Papers with Model Answers

All 56 questions of the 2019 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 2019 Economics Paper I

Question 1 (50 marks)

Q1(a) · Price Determination and Theories of Distribution · 10 marks≈ 7 min
Consumer, Production and Cost Theory: Foundations
Under competition, the cost function is given as C(y) = y² + 1, where y is output. Derive the inverse supply curve and show how the supply curve looks like.
हिंदी में प्रश्न
प्रतिस्पर्धा के अंतर्गत लागत फलन C(y) = y² + 1 है, जहाँ y उत्पादन है। प्रतिलोम पूर्ति वक्र व्युत्पन्न कीजिए और दर्शाइए कि पूर्ति वक्र कैसा दिखाई देता है।
Practise this question Price Determination and Theories of Distribution notes
Model answer
Paper and question: Paper I, Q1(a)
Approach: Find MC and AVC, apply the rule price = MC above minimum AVC (short run) and above minimum AC if the fixed cost of 1 is avoidable (long run), and sketch both supply curves.
A competitive firm takes price p as given and maximises profit π = p·y − C(y); it supplies the output at which p = MC, provided price covers average variable cost (or average cost when all costs are avoidable).
Step 1: C(y) = y² + 1, so marginal cost MC = dC/dy = 2y.
Step 2: variable cost is y², so AVC = y, whose minimum is 0 at y = 0; average cost AC = y + 1/y.
Step 3: minimum AC: d(AC)/dy = 1 − 1/y² = 0 gives y = 1, where AC = 2 and MC = 2·1 = 2 (MC cuts AC at its minimum).
Step 4: setting p = MC gives p = 2y, i.e. the inverse supply curve p = 2y, or supply y = p/2.
Short run (the 1 is a sunk fixed cost): since minimum AVC is 0, the firm produces y = p/2 at every positive price; the supply curve is the whole MC line, a straight line through the origin with slope 2.
Long run (the 1 is avoidable): the firm produces only if profit p²/4 − 1 is non-negative, i.e. p ≥ 2. Supply is y = 0 for p below 2 and y = p/2 for p ≥ 2, jumping from 0 to 1 unit at p = 2.
Diagram: y on the horizontal and p on the vertical axis; the line p = 2y through the origin (MC), the U-shaped AC = y + 1/y with minimum at (1, 2); the long-run supply curve is the vertical axis up to p = 2, then the MC line above the point (1, 2).
Thus the inverse supply curve is p = 2y: an upward-sloping straight line, truncated below p = 2 when the fixed cost can be avoided.
Q1(b) · Market Structures · 10 marks≈ 7 min
Perfect Competition and Monopoly: The Benchmarks
What determines the degree of price discrimination under monopoly market?
हिंदी में प्रश्न
एकाधिकार बाज़ार के अधीन कौन-सा कारक कीमत विभेद की कोटि को निर्धारित करता है?
Practise this question Market Structures notes
Model answer
Paper and question: Paper I, Q1(b)
Approach: Define the degrees of discrimination (Pigou), then list the factors that decide how far a monopolist can discriminate: elasticity differences, separability, information and resale costs.
Pigou (1920) classified price discrimination into three degrees: first degree (each unit sold at the buyer's maximum willingness to pay, capturing all consumer surplus), second degree (prices vary with the quantity bought, e.g. block tariffs) and third degree (different prices in separated markets).
Determinants of the degree: (i) information: first degree needs each buyer's reservation price, rarely known, so most firms use second or third degree; (ii) separation of markets: resale must be impossible or costly, as with services or distant markets; (iii) elasticity differences: since P₁/P₂ = (1 − 1/e₂)/(1 − 1/e₁), wider differences allow wider price gaps; (iv) monopoly power: close substitutes or entry limit high prices; (v) cost of segmentation must be below the extra revenue; (vi) legal and social limits such as competition law.
Diagram: a downward demand curve with MC; under perfect discrimination output extends to where D cuts MC and the whole area under D above MC becomes profit; under simple monopoly output is where MR = MC.
Thus the degree depends on how well the seller can identify and separate buyers with different elasticities; digital platforms using data on users are moving closer to first-degree discrimination.
Q1(c) · Economic Development · 10 marks≈ 7 min
Development and Environmental Sustainability
How does 'carbon trading' help in reducing environment degradation?
हिंदी में प्रश्न
पर्यावरण निम्नीकरण को कम करने में 'कार्बन ट्रेडिंग' किस प्रकार मदद करता है?
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q1(c)
Approach: Define cap and trade, explain the two channels (fixed cap; least-cost abatement through trading) and the innovation incentive, with examples and limits.
Carbon trading is a market-based instrument in which the regulator fixes the total permissible emissions (the cap), distributes or auctions tradable permits equal to it, and lets firms trade them. It applies Coase's insight that well-defined, transferable rights can internalise an externality.
How it helps: the cap guarantees the quantity of emissions; trading shifts abatement to firms that can cut emissions most cheaply, so the target is met at minimum total cost, since every firm abates until its marginal abatement cost equals the permit price; and the permit price rewards innovation and fuel switching, because each tonne saved can be sold.
International versions include the Kyoto Protocol's Clean Development Mechanism, under which Indian projects earned certified emission reductions, and the EU Emissions Trading System (2005). India's Perform, Achieve and Trade scheme (2012) trades energy-saving certificates.
Its success depends on a tight cap, accurate monitoring and stable prices.
Q1(d) · Economic Development · 10 marks≈ 7 min
Measuring Development: Human Development Indices and the Basic Needs Approach
How is Human Development Index calculated by UNDP? Can there be a better method of assigning weights to various indicators?
हिंदी में प्रश्न
यू०एन०डी०पी० द्वारा मानव विकास सूचकांक का परिकलन किस प्रकार किया जाता है? क्या विभिन्न संकेतकों का भार नियत करने की इससे बेहतर विधि हो सकती है?
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q1(d)
Approach: Give the HDI calculation (indicators, goalposts, dimension indices, geometric mean), then discuss whether better weighting methods exist (statistical, participatory, data-driven) and their limits.
Calculation: UNDP's HDI has three dimensions. Health: life expectancy at birth (goalposts 20 and 85). Education: mean years of schooling (maximum 15) and expected years of schooling (maximum 18), averaged. Income: log of GNI per head in PPP dollars (goalposts 100 and 75,000). Each dimension index = (actual − min)/(max − min), and HDI = (I_health × I_education × I_income)^(1/3), so each dimension implicitly gets equal weight.
Better weights? Equal weights are simple but arbitrary. Alternatives: (i) statistical weights from principal component analysis (Noorbakhsh, 1998); (ii) 'benefit of the doubt' weights from data envelopment analysis, letting each country be judged by its best dimension; (iii) participatory weights from surveys of people's priorities; (iv) weights based on the shadow prices or trade-offs society accepts, prompted by Ravallion's (2012) critique.
Since 2010 the geometric mean also penalises uneven achievement across dimensions, which partly answers the weighting criticism.
Each alternative has its own arbitrariness and makes the index harder to understand, so UNDP retains equal weights for transparency and tests the robustness of rankings.
Q1(e) · Theories of Employment, Income and Interest · 10 marks≈ 7 min
Keynesian Theory of Income and Employment
Show that in a simple Keynesian model, equal expansion in tax and government expenditure does not always lead to balanced budget theorem.
हिंदी में प्रश्न
दर्शाइए कि सरल कींसवादी मॉडल में, कर और सरकारी व्यय में बराबर के विस्तार से सदैव संतुलित बजट प्रमेय नहीं उत्पन्न होता है।
Practise this question Theories of Employment, Income and Interest notes
Model answer
Paper and question: Paper I, Q1(e)
Approach: Derive the unit balanced-budget multiplier under lump-sum taxes, then show with a proportional income tax and with imports that equal changes in G and T do not raise income by the same amount.
The balanced budget multiplier theorem (Haavelmo, 1945) states that an equal increase in government spending and taxes raises income by the same amount, i.e. the multiplier is 1.
Lump-sum case: with C = a + c(Y − T), ΔY = ΔG/(1 − c) − c·ΔT/(1 − c). Setting ΔG = ΔT gives ΔY = ΔG(1 − c)/(1 − c) = ΔG: multiplier 1.
Proportional tax: with T = tY, Y(1 − c + ct) = A + G. If G rises by ΔG and the tax rate by Δt so that revenue at the initial income rises by Y·Δt = ΔG, then ΔY = ΔG(1 − c)/(1 − c + ct), less than ΔG; with c = 0.8 and t = 0.25, ΔY = 0.5·ΔG.
Open economy: with imports M = mY, ΔY = ΔG(1 − c)/(1 − c + m), which is less than ΔG; with c = 0.8 and m = 0.2 the balanced-budget multiplier is 0.2/0.4 = 0.5.

Question 2 (50 marks)

Q2(a) · Economic Development · 15 marks≈ 11 min
Development and Environmental Sustainability
'Tragedy of the commons' leads to over-exploitation of resources. Analyze.
हिंदी में प्रश्न
'कॉमन्स की त्रासदी' संसाधनों के अतिशोषण की ओर ले जाती है। विश्लेषण कीजिए।
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q2(a)
Approach: Explain Hardin's tragedy of the commons (rivalry plus non-excludability), show over-exploitation with the open-access fishery model and diagram, give examples, then remedies including Ostrom's critique.
Garrett Hardin ('The Tragedy of the Commons', 1968) argued that when a resource is rival in use but non-excludable, each user captures the full benefit of extra use but bears only a fraction of the cost of depletion, so rational individuals together destroy the resource. His example was herders adding cattle to a common pasture.
Mechanism: under open access, users enter until average revenue equals marginal cost, ignoring the stock externality they impose on others. Each user's extra catch reduces the stock and so raises everyone else's cost of fishing. H. Scott Gordon (1954) showed for fisheries that rent is fully dissipated.
Diagram: fishing effort on the horizontal axis; total revenue as an inverted U (from the biological yield curve) and total cost as a straight line from the origin; the efficient effort is where the slopes are equal (maximum rent); open access pushes effort to where TR = TC, beyond the efficient level and often beyond maximum sustainable yield.
Illustrations: collapse of the Newfoundland cod fishery (1992), groundwater depletion in north-west India, overgrazing of village commons, and the atmosphere as a free dump for greenhouse gases.
Remedies: private or state property rights, quotas and tradable permits (individual transferable quotas), taxes and licences. Elinor Ostrom (Governing the Commons, 1990; Nobel 2009) showed that communities often manage commons sustainably through local rules, monitoring and sanctions, as with Joint Forest Management in India; the tragedy is of open access, not of common property.
Q2(b) · Theories of Employment, Income and Interest · 15 marks≈ 11 min
IS-LM Model and the Neo-classical Synthesis
The following data are given for an economy:
Consumption function, C = 250 + 0.5 (Y − T) − 500r
Investment function, I = 250 − 500r
Real money demand function, L/P = 0.5Y − 500r
Nominal money supply, M = 7650
Price level, P = 17
Tax = T = Government expenditure = G = 200
Here Y = Real income, r = Real rate of interest, L = Nominal money demand, P = Price level.
(i) Find the equations for IS and LM curves, and solve for Y and r.
(ii) Find out the multiplier formula for money supply change and then calculate the change in output if money supply changes by 510. (7+8=15)
हिंदी में प्रश्न
एक अर्थव्यवस्था के लिए निम्नलिखित डाटा दिया जाता है:
उपभोग फलन, C = 250 + 0.5 (Y − T) − 500r
निवेश फलन, I = 250 − 500r
वास्तविक मुद्रा माँग फलन, L/P = 0.5Y − 500r
नियत मुद्रा पूर्ति, M = 7650
कीमत स्तर, P = 17
कर = T = सरकारी व्यय = G = 200
यहाँ Y = वास्तविक आय, r = वास्तविक ब्याज दर, L = नियत मुद्रा माँग, P = कीमत स्तर।
(i) IS और LM वक्रों के लिए समीकरण ज्ञात कीजिए और Y एवं r का हल निकालिए।
(ii) मुद्रा पूर्ति परिवर्तन के लिए गुणक फॉर्मूला ज्ञात कीजिए और उसके बाद अगर मुद्रा पूर्ति में परिवर्तन 510 द्वारा हो, तो उत्पादन में परिवर्तन का परिकलन कीजिए। (7+8=15)
Practise this question Theories of Employment, Income and Interest notes
Model answer
Paper and question: Paper I, Q2(b)
Approach: Substitute the functions to get IS and LM (with M/P = 450), solve for Y and r, then derive the money-supply multiplier by eliminating r and apply it to ΔM = 510.
Income and the interest rate are determined where the goods market (IS) and the money market (LM) clear together. Note that both consumption and investment depend on the real interest rate.
Step 1 (IS): Y = 250 + 0.5(Y − 200) − 500r + 250 − 500r + 200 = 600 + 0.5Y − 1000r, so 0.5Y = 600 − 1000r and IS: Y = 1200 − 2000r.
Step 2 (LM): real money supply M/P = 7650/17 = 450; 450 = 0.5Y − 500r, so LM: Y = 900 + 1000r.
Step 3: 1200 − 2000r = 900 + 1000r gives r = 0.1 (10 per cent) and Y = 1000.
Multiplier: from IS, r = (1200 − Y)/2000. Substituting in LM: 0.5Y − 0.25(1200 − Y) = M/P, so 0.75Y = M/P + 300 and Y = (M/P + 300)/0.75. Hence dY/d(M/P) = 1/0.75 = 4/3. In general form, dY/d(M/P) = (b/h)/[(1 − c) + bk/h] = (1000/500)/[0.5 + 1] = 4/3, where b = 1000 is the total interest sensitivity of spending, h = 500, k = 0.5 and c = 0.5.
Step 5: ΔM = 510 with P = 17 gives Δ(M/P) = 30, so ΔY = (4/3) × 30 = 40; equivalently dY/dM = 4/51 per rupee of nominal money.
Results: IS is Y = 1200 − 2000r, LM is Y = 900 + 1000r; equilibrium income is 1000 at a real interest rate of 10 per cent; a rise of 510 in the nominal money supply raises output by 40 (to 1040), and the interest rate falls to 0.08.
Interpretation: extra real balances lower the interest rate, which raises both investment and consumption; the multiplier is smaller than 1/k = 2 because part of the money is absorbed by higher interest-sensitive money demand as r falls.
Q2(c) · Trade Policy, Protection and the WTO · 20 marks≈ 14 min
Trade Policy and Developing Countries
How can controls on foreign trade contribute to the development of developing countries?
हिंदी में प्रश्न
विदेश व्यापार पर नियंत्रण, विकासशील देशों के विकास में किस प्रकार योगदान कर सकते हैं?
Practise this question Trade Policy, Protection and the WTO notes
Model answer
Paper and question: Paper I, Q2(c)
Approach: Explain the developmental arguments for trade controls (infant industry, foreign-exchange and BoP, terms of trade, revenue, industrialisation and employment, protection against dumping and volatility), with Indian and East Asian examples, then the costs and conditions for success.
Controls on foreign trade include tariffs, quotas, import licensing, exchange controls, export duties and subsidies. Although free trade maximises static efficiency, developing countries have used controls to promote development.
Contributions: (i) infant-industry protection (Hamilton, List): temporary protection lets new industries gain scale and experience until they can compete, as with Korea's steel and shipbuilding and India's early automobile and pharmaceutical industries; (ii) balance of payments: import and exchange controls conserve scarce foreign exchange for capital goods and essentials, as in India's planning era; (iii) industrialisation and diversification away from primary exports facing declining terms of trade (Prebisch-Singer), reducing vulnerability to commodity price swings; (iv) revenue: customs duties are easy to collect where income taxes are hard to administer; (v) terms of trade: export taxes or restraints by large suppliers can raise export prices; (vi) employment and protection of vulnerable sectors such as small farmers against subsidised imports; (vii) protection against dumping through anti-dumping and safeguard duties; (viii) strategic and security goals, such as food and defence self-reliance.
Conditions and costs: controls help only when temporary, selective and tied to performance; East Asian countries used protection with export targets and competition, whereas long-lasting, indiscriminate controls in India and Latin America created high-cost industries, rent-seeking under the licence raj (Krueger, 1974), anti-export bias and slow growth. Controls also invite retaliation and are limited by WTO rules.
Current practice: India's tariff increases on electronics and solar equipment since 2018, combined with production-linked incentives from 2020, aim to build domestic capacity within value chains.
Hence trade controls can contribute to development as a temporary, targeted tool within an outward-oriented strategy, but become a drag when used as a permanent substitute for competitiveness.

Question 3 (50 marks)

Q3(a) · Public Finance · 15 marks≈ 11 min
Taxation: Sources of Revenue, Forms, Incidence and Effects
The role of income and substitution effect is crucial in producing backward bending labour supply curve when a tax is imposed on wages. Do you agree?
हिंदी में प्रश्न
जब मजदूरियों पर कर आरोपित किया जाता है, तब पीछे की ओर झुकने वाले श्रम पूर्ति वक्र को उत्पन्न करने में आय और प्रतिस्थापन प्रभाव की भूमिका निर्णायक होती है। क्या आप सहमत हैं?
Practise this question Public Finance notes
Model answer
Paper and question: Paper I, Q3(a)
Approach: Agree, with qualification: use the income-leisure diagram to show that a wage tax has opposite substitution and income effects, and that a backward-bending supply arises when the income effect dominates.
Yes. A tax on wages lowers the net wage, and its effect on hours worked depends on two opposing forces, the substitution effect and the income effect, as in Hicks's analysis of labour supply.
The substitution effect: leisure becomes cheaper because an hour of leisure now costs less forgone net income, so the worker substitutes leisure for work and supplies fewer hours.
The income effect: the tax makes the worker poorer; since leisure is a normal good, he consumes less leisure and works more to maintain his income.
Diagram: leisure on the horizontal axis (maximum 24 hours) and income on the vertical axis; the budget line pivots down from the 24-hour point when the net wage falls; the worker moves from E₀ on IC₀ to E₁ on a lower curve; a compensated budget line parallel to the new one and tangent to IC₀ splits the move into the substitution effect (more leisure) and the income effect (less leisure).
If the substitution effect dominates, the tax reduces hours; if the income effect dominates, as at high wages or for target earners who must meet fixed commitments, the tax increases hours. Tracing hours against the net wage gives a labour supply curve that slopes upward at low wages and bends backward at high wages, where the income effect dominates.
Hence the backward-bending supply curve is purely a result of the relative strength of the two effects, which is why the effect of a wage tax on work effort is ambiguous in theory and an empirical question. Evidence suggests that prime-age men's hours respond little, while second earners respond more.
Q3(b) · Balance of Payments and Exchange Rates · 15 marks≈ 11 min
Policy Mix: Swan Diagram, Mundell's Assignment and Mundell-Fleming
In case of perfect capital mobility, explain the difference of the impact of an increase in money supply on GDP under two alternative exchange rate regimes—one fixed and the other flexible.
हिंदी में प्रश्न
पूर्ण पूँजी गतिशीलता के मामले में, दो वैकल्पिक विनिमय दर व्यवस्थाओं—एक नियत और दूसरी नम्य—के अधीन मुद्रा पूर्ति में वृद्धि के जी०डी०पी० पर होने वाले प्रभाव में अंतर को स्पष्ट कीजिए।
Practise this question Balance of Payments and Exchange Rates notes
Model answer
Paper and question: Paper I, Q3(b)
Approach: Compare the effect of a money supply increase under fixed and flexible rates with perfect capital mobility in the Mundell-Fleming model, with diagrams and the mechanism (reserve loss versus depreciation).
With perfect capital mobility, the domestic interest rate must equal the world rate r*, so in the Mundell-Fleming model the BP curve is horizontal at r*. An increase in the money supply shifts LM right and tends to lower r below r*.
Fixed exchange rate: the incipient fall in r causes capital outflows and pressure for depreciation. To maintain the peg, the central bank sells foreign exchange and absorbs domestic currency, so the money supply falls back and LM returns to its original position. GDP is unchanged; the only result is a loss of reserves matched by a rise in domestic credit. Monetary policy is ineffective.
Flexible exchange rate: the outflow of capital makes the currency depreciate; depreciation raises net exports and shifts IS right until it intersects the new LM at r*. GDP rises from Y1 to Y2, with the whole effect working through net exports. Monetary policy is fully effective.
Diagram: two panels with IS, LM and a horizontal BP at r*; in the fixed-rate panel LM shifts right and back; in the flexible panel LM shifts right and IS follows it, giving higher Y at r*.
The difference arises because under a fixed rate the money supply is not under the central bank's control, while under a flexible rate it is, illustrating the impossible trinity.
Q3(c) · Market Structures · 20 marks≈ 14 min
Monopolistic Competition (Chamberlin and Robinson)
Reflect on the inefficiency and socially undesirable aspects of monopolistic competition market situation vis-à-vis the perfect competition, both in the short and in the long run.
हिंदी में प्रश्न
पूर्ण प्रतियोगिता बाज़ार की तुलना में एकाधिकारात्मक प्रतियोगिता वाले बाज़ार के अल्पकाल और दीर्घकाल दोनों में अदक्षता और सामाजिक दृष्टि से अवांछनीय पक्षों पर अपने विचार प्रकट कीजिए।
Practise this question Market Structures notes
Model answer
Paper and question: Paper I, Q3(c)
Approach: Compare monopolistic competition with perfect competition in the short and long run on price, output, efficiency (allocative, productive), selling costs and welfare, with the tangency diagram, then give the counter-arguments.
Under perfect competition long-run equilibrium satisfies P = MC = minimum LAC: output is produced at the lowest cost (productive efficiency) and in the quantity consumers value at its marginal cost (allocative efficiency). Monopolistic competition (Chamberlin, 1933; Joan Robinson, 1933) departs from this in several ways.
Short run: each firm faces a downward-sloping demand curve and produces where MR = MC, so P exceeds MC: output is restricted and there is a deadweight loss, as under monopoly though smaller because demand is elastic. Firms may earn supernormal profits that are not competed away immediately.
Long run: free entry removes supernormal profit, but the tangency of AR with LAC occurs on the falling part of LAC. Hence (i) excess capacity: output is below minimum-cost output, so productive efficiency fails; (ii) P = LAC is above minimum LAC, so consumers pay more than under competition; (iii) P exceeds MC, so allocative efficiency fails and a deadweight loss persists.
Other undesirable aspects: (i) selling costs (advertising) raise costs and may be wasteful or manipulative; (ii) too many firms and brands duplicate fixed costs; (iii) product differentiation may be artificial; (iv) consumer ignorance can be exploited.
Diagram: two panels: perfect competition with a horizontal AR tangent to LAC at its minimum (Qc, Pc); monopolistic competition with a downward AR tangent to LAC at E (Qm less than Qc, Pm greater than Pc) and MR = LMC below E; shade the deadweight loss between AR and LMC.
Counter-arguments: Chamberlin held that the competitive benchmark is not 'ideal' because consumers value variety; Dixit and Stiglitz (1977) showed the market may produce too few or too many varieties. Advertising can also inform consumers and lower search costs.
Monopolistic competition is therefore inefficient by the standard of perfect competition in both runs, but the welfare loss is partly the price of diversity, and in many markets it is small.

Question 4 (50 marks)

Q4(a) · Market Structures · 15 marks≈ 11 min
Duopoly Models: Cournot, Bertrand, Stackelberg and Edgeworth
What is the follower's problem in a duopoly model and how does it differ from the leader's problem?
हिंदी में प्रश्न
द्वि-अधिकार मॉडल में अनुयायी की क्या समस्या होती है और यह अग्रणी की समस्या से किस प्रकार भिन्न होती है?
Practise this question Market Structures notes
Model answer
Paper and question: Paper I, Q4(a)
Approach: Explain the Stackelberg follower's problem (maximise profit taking the leader's output as given, yielding a reaction function) and the leader's problem (maximise profit subject to the follower's reaction function), with an illustration and diagram.
In the Stackelberg model (1934) one firm, the leader, chooses output first and commits to it; the other, the follower, observes this and then chooses its output. The two firms therefore solve different problems.
Follower's problem: maximise π₂ = P(q₁ + q₂)q₂ − C₂(q₂), taking the leader's output q₁ as given. The first-order condition yields the follower's reaction function q₂ = R₂(q₁), exactly as in Cournot: the follower behaves passively, with zero conjectural variation.
Leader's problem: maximise π₁ = P(q₁ + R₂(q₁))q₁ − C₁(q₁), i.e. maximise profit subject to the follower's reaction function. The leader is sophisticated: it knows that a larger q₁ will induce a smaller q₂ (its conjectural variation equals the slope of R₂), and exploits this.
Illustration: with P = a − bQ and cost c for both, R₂: q₂ = (a − c)/2b − q₁/2. Substituting, the leader produces (a − c)/2b, the follower (a − c)/4b, and the leader's profit exceeds its Cournot profit.
Differences: the follower moves second and optimises given an output; the leader knows the follower's reaction function and optimises along it, gaining a first-mover advantage; total output exceeds the Cournot level.
Diagram: q₁ and q₂ axes; follower's reaction line R₂; leader's isoprofit curves; the Stackelberg point S where the leader's lowest attainable isoprofit curve (highest profit) is tangent to R₂, to the right of the Cournot point C.
If both firms try to lead, a 'Stackelberg disequilibrium' or price war results, so the model needs a natural leader.
Q4(b) · Economic Development · 15 marks≈ 11 min
Planning, Tinbergen, Market versus Planning and Public-Private Partnership
Can public-private partnership function effectively in the area of physical infrastructure?
हिंदी में प्रश्न
क्या सार्वजनिक-निजी साझेदारी, भौतिक आधारिक संरचना के क्षेत्र में प्रभावशाली रूप से कार्य कर सकती है?
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q4(b)
Approach: Answer yes, conditionally: explain why physical infrastructure suits PPP, review Indian experience (successes and problems), and state the conditions under which PPP functions effectively.
Yes, but only under the right conditions. Physical infrastructure (roads, ports, airports, power, urban transport) suits PPP because outputs are measurable, user charges can generate revenue, and private firms can bring finance, construction efficiency and better maintenance.
Successes in India: modernisation of the Delhi and Mumbai airports (2006) and the greenfield Hyderabad and Bengaluru airports; private ports such as Mundra; national highways under BOT and, since 2016, the Hybrid Annuity Model; and private participation in power generation and transmission.
Problems: after 2011 many highway and power PPPs stalled because of aggressive bidding, delays in land acquisition and clearances, over-optimistic traffic forecasts, weak dispute resolution and stressed balance sheets of developers and banks (the twin balance sheet problem). The Delhi Airport Metro Express line was handed back in 2013.
Conditions for effectiveness: (i) allocation of each risk to the party best able to manage it, with land and clearances provided upfront by government; (ii) realistic project preparation and transparent bidding; (iii) independent regulation of tariffs and quality; (iv) a fair renegotiation and dispute-resolution framework, as the Kelkar Committee (2015) recommended; (v) long-term finance through infrastructure debt funds, viability gap funding and InvITs; (vi) shifting to annuity or hybrid models where demand risk is high.
Hence PPP can function effectively in physical infrastructure if contracts are well designed and governments retain strong regulatory capacity.
Q4(c) · Theories of International Trade · 20 marks≈ 14 min
Product Cycle, New Trade Theory and Strategic Trade Policy
What are the features based on which the new trade theories are built that are distinctly different from the old theories?
हिंदी में प्रश्न
वे कौन-से अभिलक्षण हैं, जिन पर आधारित ऐसी नई व्यापार थियोरियों का निर्माण किया जाता है, जो पुरानी थियोरियों से सुस्पष्ट रूप से भिन्न होती हैं?
Practise this question Theories of International Trade notes
Model answer
Paper and question: Paper I, Q4(c)
Approach: List and explain the features on which new trade theories rest (increasing returns, imperfect competition, product differentiation and love of variety, intra-industry trade, firm heterogeneity, geography and history, strategic policy), contrasting each with the old theory.
Old theories (Ricardo, Heckscher-Ohlin) explain trade by differences in technology or endowments under perfect competition and constant returns. From the late 1970s, Paul Krugman, Elhanan Helpman, Avinash Dixit, James Brander and Barbara Spencer built new trade theories on distinctly different features.
(i) Increasing returns to scale: internal or external economies of scale make specialisation profitable even between identical countries, whereas old theories assume constant returns. (ii) Imperfect competition: monopolistic competition (Krugman, 1979, 1980) or oligopoly (Brander, 1981; Brander and Krugman, 1983) replaces perfect competition, so prices exceed marginal cost and trade has pro-competitive effects. (iii) Product differentiation and love of variety (Dixit-Stiglitz, 1977): consumers gain from more varieties, a source of gains absent in old theory. (iv) Intra-industry trade: two-way trade in similar products between similar countries, measured by the Grubel-Lloyd index, which old theory cannot explain.
(v) History, geography and the home-market effect: with scale economies and transport costs, the location of industry depends on market size and on who started first (Krugman, 1991, new economic geography); old theory gives a determinate pattern from endowments. (vi) Strategic interaction and policy: in oligopolistic industries, export subsidies can shift profits to domestic firms (Brander and Spencer, 1985), whereas old theory makes free trade optimal for a small country. (vii) Firm heterogeneity (Melitz, 2003): only the most productive firms export, and trade raises industry productivity by reallocating output to them.
Examples include aircraft (Boeing and Airbus), cars and electronics trade among rich countries.
These features explain why most trade is among similar high-income countries and why trade liberalisation brings gains through scale, variety and productivity rather than only through comparative advantage.

Question 5 (50 marks)

Q5(a) · Money and Monetary Management · 10 marks≈ 7 min
Supply of Money and the Money Multiplier
Explain how money multiplier will be affected if there happens to be partial hoarding by public in each round as well as excess cash reserve holding by banks over the minimum required.
हिंदी में प्रश्न
स्पष्ट कीजिए कि यदि प्रत्येक फेरे में जनता द्वारा आंशिक जमाखोरी की जाय और साथ-ही-साथ बैंकों के द्वारा आवश्यक न्यूनतम के ऊपर फालतू नकदी आरक्षित की जाय, तो मुद्रा गुणक पर इसका किस प्रकार प्रभाव पड़ेगा।
Practise this question Money and Monetary Management notes
Model answer
Paper and question: Paper I, Q5(a)
Approach: Derive the multiplier with a currency drain c and excess reserves e: m = (1 + c)/(c + r + e); show each leakage lowers m, with a numerical comparison.
Partial hoarding by the public: in each round of lending, the public keeps a fraction of the new money as currency, so that currency C = cD. This cash does not return to banks as reserves, so it is a leakage from the credit-creation process.
Excess reserves: banks keep reserves above the minimum, in proportion e of deposits, because of uncertainty or lack of creditworthy borrowers. Total reserves R = (r + e)D.
Derivation: H = C + R = (c + r + e)D and M = C + D = (1 + c)D, so m = M/H = (1 + c)/(c + r + e). Both c and e appear in the denominator, so each lowers m (since r + e is less than 1, a higher c also lowers m).
Illustration: with r = 0.1 alone, the deposit multiplier is 10; adding c = 0.2 gives 1.2/0.3 = 4; adding e = 0.05 as well gives 1.2/0.35 ≈ 3.43.
Q5(b) · Money and Monetary Management · 10 marks≈ 7 min
Quantity Theories of Money: Fisher, Cambridge (Pigou) and Friedman
In what sense is Friedman's quantity theory said to be a 'restatement' of Fisher's theory? Explain.
हिंदी में प्रश्न
किन मायनों में फ्रीडमैन की परिमाण थियोरी को फिशर की थियोरी का 'पुनःकथन' कहा जाता है? स्पष्ट कीजिए।
Practise this question Money and Monetary Management notes
Model answer
Paper and question: Paper I, Q5(b)
Approach: Explain what Friedman retained from the quantity theory (stable velocity, money drives nominal income, long-run neutrality) and what he changed (a theory of money demand as an asset, variable but predictable velocity, short-run real effects).
Friedman called his 1956 essay 'The Quantity Theory of Money: A Restatement' because it re-expresses the old theory in modern terms while keeping its central message.
What is restated (retained): (i) the core proposition that changes in the money supply are the main cause of changes in nominal income and, in the long run, of the price level ('inflation is always and everywhere a monetary phenomenon', Friedman, 1970); (ii) the stability of the relation between money and income, now expressed as a stable demand for money and hence a predictable velocity; (iii) long-run neutrality of money.
What is new: (i) the theory becomes a theory of the demand for money, derived from portfolio choice: M/P = f(yₚ, w, r_b, r_e, πᵉ, u); (ii) velocity is not a constant fixed by institutions, as in Fisher, but a stable function of permanent income and yields;
(iii) it applies to the short run too, allowing money to affect output as well as prices; (iv) interest rates and expected inflation enter explicitly.
Q5(c) · Welfare Economics · 10 marks≈ 7 min
Pareto Optimality and the Fundamental Theorems of Welfare Economics
What criteria will have to be satisfied to obtain a Pareto efficient allocation?
हिंदी में प्रश्न
पैरेटो दक्ष नियतन को प्राप्त करने के लिए कौन-कौन से मानदंडों को संतुष्ट करना पड़ेगा?
Practise this question Welfare Economics notes
Model answer
Paper and question: Paper I, Q5(c)
Approach: List the three marginal conditions (exchange, production, product mix) with the second-order and institutional conditions, briefly, with the Edgeworth box.
An allocation is Pareto efficient (Pareto, 1906) if no reallocation can make someone better off without making someone else worse off. In a 2 goods × 2 consumers × 2 factors economy it requires:
1. Efficiency in exchange: MRSᴬₓᵧ = MRSᴮₓᵧ; goods are distributed so that consumers' indifference curves are tangent (exchange contract curve).
2. Efficiency in production: MRTSˣₗₖ = MRTSʸₗₖ; factors are allocated so that the producers' isoquants are tangent (production contract curve), placing the economy on its production possibility curve.
3. Efficiency in product mix: MRSₓᵧ = MRTₓᵧ; the rate at which consumers are willing to substitute goods equals the rate at which the economy can transform one into the other.
Other criteria: second-order conditions (convex indifference curves and isoquants, a concave PPC) and the absence of externalities, public goods and monopoly; otherwise private marginal rates diverge from social ones.
Diagram: an Edgeworth box with consumers' indifference curves tangent along the contract curve; points off the curve allow a mutually beneficial trade.
Perfect competition satisfies all three because everyone faces the same prices.
Q5(d) · Public Finance · 10 marks≈ 7 min
Role of Government in a Market Economy: Allocation, Distribution, Stabilisation and Development
Automatic stabilizers are supposed to mitigate cyclical fluctuations, but there exist limitations which dampen the effect of these stabilizers. Analyze.
हिंदी में प्रश्न
माना जाता है कि स्वचालित स्थिरीकारी, चक्रीय उच्चावचनों की तीव्रता को कम कर देते हैं, लेकिन कुछ सीमाएँ भी हैं, जो इन स्थिरीकारियों के प्रभाव को घटा देती हैं। विश्लेषण कीजिए।
Practise this question Public Finance notes
Model answer
Paper and question: Paper I, Q5(d)
Approach: Define automatic stabilisers and show how they work, then analyse the limitations that weaken them, especially in developing economies.
Automatic (built-in) stabilisers are budget features, such as progressive income tax and unemployment benefits, that change revenue and spending with the cycle without any new decision. In a recession revenue falls and transfers rise, so disposable income falls less than national income.
They lower the multiplier: with a proportional tax rate t, the multiplier becomes 1/[1 − c(1 − t)], smaller than 1/(1 − c), so a given shock moves output less.
Limitations: (i) they only dampen fluctuations and cannot restore full employment after a deep shock; (ii) they cause fiscal drag, as rising revenue slows the recovery; (iii) their strength depends on the size of government and the progressivity of taxes, and in India the income tax base is narrow, indirect taxes dominate and unemployment insurance is largely absent; (iv) the large informal sector lies outside the tax and transfer system.
Thus automatic stabilisers are a useful first line of defence, but they must be supplemented by discretionary fiscal and monetary policy.
Q5(e) · Balance of Payments and Exchange Rates · 10 marks≈ 7 min
Capital Mobility, Speculation and International Policy Coordination
What are the obstacles to international macro-economic policy coordination? Discuss.
हिंदी में प्रश्न
अंतर्राष्ट्रीय समष्टि-अर्थशास्त्रीय नीति समन्वय के सामने क्या-क्या बाधाएँ हैं? चर्चा कीजिए।
Practise this question Balance of Payments and Exchange Rates notes
Model answer
Paper and question: Paper I, Q5(e)
Approach: Define international macroeconomic policy coordination and its rationale (spillovers), then list the obstacles (divergent objectives, model uncertainty, information, free-riding and credibility, domestic politics and sovereignty, asymmetric power), with examples.
International policy coordination means countries adjusting their monetary, fiscal and exchange-rate policies jointly, recognising that one country's policies spill over to others through trade, capital flows and exchange rates. Examples are the Plaza Accord (1985), the Louvre Accord (1987) and the G-20 stimulus of 2009.
Obstacles: (i) different objectives and priorities: one country fears inflation, another unemployment; (ii) model uncertainty: governments disagree about how the economy works, and Frankel and Rockett (1988) showed that coordination based on the wrong model can make countries worse off; (iii) information problems about others' situations and intentions; (iv) free-riding and credibility: each country gains by deviating once others have committed, and agreements are hard to enforce.
(v) Domestic politics and sovereignty: legislatures, electoral cycles and independent central banks limit governments' ability to commit; (vi) asymmetric power: large economies dominate, and developing countries fear their interests will be ignored.
Hence coordination occurs mainly in crises, while in normal times countries rely on information exchange through the IMF and G-20.

Question 6 (50 marks)

Q6(a) · Price Determination and Theories of Distribution · 15 marks≈ 11 min
Marshallian and Walrasian Approaches to Price Determination
How is the Marshallian equilibrium different from Walrasian equilibrium?
हिंदी में प्रश्न
मार्शली संतुलन, वालरसी संतुलन से किस प्रकार भिन्न है?
Practise this question Price Determination and Theories of Distribution notes
Model answer
Paper and question: Paper I, Q6(a)
Approach: Contrast the two notions of equilibrium (partial versus general, quantity versus price adjustment, assumptions) and then their stability conditions, with one diagram.
Marshallian equilibrium (Marshall, Principles of Economics, 1890) is a partial equilibrium: one market is studied under ceteris paribus, with other prices, incomes and the marginal utility of money constant; equilibrium is where demand price equals supply price.
Walrasian equilibrium (Walras, Éléments d'économie politique pure, 1874) is a general equilibrium: every market's demand and supply depend on all prices, and equilibrium is a price vector at which excess demand is zero in all n markets simultaneously. By Walras' Law the value of excess demands sums to zero, so only n − 1 equations are independent and one good serves as numeraire; only relative prices are determined.
Differences: (i) scope: one market versus the whole economy with interdependence; (ii) adjusting variable: quantity (producers respond to price gaps) versus price (tâtonnement by an auctioneer responding to quantity gaps); (iii) time: Marshall distinguishes market, short and long periods, Walras has a timeless simultaneous system; (iv) the existence of Walrasian equilibrium was later proved by Arrow and Debreu (1954).
Stability: Marshall requires Pd′(Q) less than Ps′(Q); Walras requires D′(P) less than S′(P). They coincide for normal curves but conflict when demand and supply slope the same way, as with backward-bending supply or Giffen demand.
Diagram: (P, Q) space with normal DD and SS crossing at E; at P1 above P* mark the horizontal gap (excess supply, Walras) and at Q1 below Q* the vertical gap (demand price above supply price, Marshall); both arrows point back to E.
Conclusion: Marshall's method is simpler for applied work on one industry; Walras captures interdependence, which matters when a change is large.
Q6(b) · Theories of Growth · 15 marks≈ 11 min
Neo-classical (Solow) and Endogenous Growth: Human Capital and R&D
Discuss the essential features of the growth models which incorporate research and development.
हिंदी में प्रश्न
संवृद्धि मॉडलों के उन अत्यावश्यक अभिलक्षणों पर चर्चा कीजिए, जिनमें अनुसंधान और विकास समाविष्ट किया हुआ होता है।
Practise this question Theories of Growth notes
Model answer
Paper and question: Paper I, Q6(b)
Approach: List and explain the common features of R&D-based growth models (Romer 1990, Grossman-Helpman, Aghion-Howitt, Jones) with the key equation and implications.
R&D-based models, pioneered by Paul Romer (1990), Grossman and Helpman (1991) and Aghion and Howitt (1992), make technical progress the outcome of purposeful investment in research. Their essential features are as follows.
(i) Endogenous technology: the stock of knowledge A grows through an idea production function, typically Ȧ = δ·L_A·A (Romer) or Ȧ = δL_A^λA^φ (Jones, 1995), so growth depends on resources in research and their productivity. (ii) Non-rival, partly excludable ideas: ideas can be used by all at once, giving increasing returns, but patents allow temporary exclusion. (iii) Imperfect competition: innovators earn monopoly rents (monopolistic competition among intermediate-goods producers in Romer; creative destruction in Aghion-Howitt, where each new quality displaces the old monopolist), which finance the fixed cost of research.
(iv) Knowledge spillovers: researchers 'stand on the shoulders of giants', as past ideas raise the productivity of current research, so returns do not diminish. (v) Market failure: because of spillovers, mark-ups and business-stealing, the market rate of R&D differs from the social optimum, usually being too low. (vi) Scale effects: in first-generation models larger economies or more researchers mean faster growth, a prediction that Jones's semi-endogenous model corrected.
Implications: policy can raise long-run growth through research subsidies, patent design, education of scientists, competition policy and openness to knowledge flows; international trade enlarges markets and speeds diffusion.
These models thus explain persistent growth and the role of innovation.
Q6(c) · Economic Development · 20 marks≈ 14 min
Myrdal, Kuznets and Structural Change; Role of Agriculture
In the contemporary world, many countries are not following Kuznets' pattern of structural change. Give reasons.
हिंदी में प्रश्न
समकालीन संसार में अनेक देश कुज़नेट्स के संरचनात्मक परिवर्तन के पैटर्न का अनुसरण नहीं कर रहे हैं। कारण बताइए।
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q6(c)
Approach: State Kuznets's pattern of structural change, then give the reasons many developing countries depart from it (premature deindustrialisation, services-led growth, technology, global value chains, China, informality), with India as an example.
Kuznets's pattern (Modern Economic Growth, 1966), building on Fisher and Clark, is that as income rises the shares of agriculture in output and employment fall, the share of industry, especially manufacturing, rises to a peak, and services expand later. Today's advanced economies and East Asia followed this sequence.
Many developing countries are not following it: (i) premature deindustrialisation: Dani Rodrik (2016) showed that manufacturing's share of employment now peaks at much lower levels of income and at lower shares than in early industrialisers, so economies move from agriculture to services directly; (ii) labour-saving technology: automation and capital-intensive techniques reduce the jobs created per unit of manufacturing output; (iii) global competition: China's scale in labour-intensive manufacturing since the 1990s has made it hard for others to enter, and falling relative prices of manufactures reduce their share in nominal output; (iv) global value chains: countries specialise in tasks rather than whole industries; (v) services revolution: information technology and tradable services allow services-led growth, as in India's IT and business services; (vi) domestic constraints: poor infrastructure, rigid labour and land laws, small firms and weak skills hold back manufacturing; (vii) informality: workers leaving agriculture move into low-productivity informal services and construction.
India illustrates this: agriculture's share in GVA fell to about 18% but it still employed about 46% of workers in PLFS 2023–24, while manufacturing's share in GVA has stayed around 15–17% for decades and services provide over half of GVA.
Diagram: sector shares against income per head: agriculture falling, services rising steadily, and manufacturing an inverted U whose peak is lower and occurs at lower income for late developers.
The departure matters because manufacturing has unconditional productivity convergence and absorbs low-skilled labour; hence policies such as Make in India (2014) and the production-linked incentive schemes (2020) aim to revive it, while services-led growth must be made more employment-intensive.

Question 7 (50 marks)

Q7(a) · Trade Policy, Protection and the WTO · 15 marks≈ 11 min
Tariffs and Quotas: Effects and Comparison
In what way does the concept of a positive optimal tariff apply to only large countries and not to small countries? Explain.
हिंदी में प्रश्न
सकारात्मक इष्टतम शुल्क की संकल्पना किस प्रकार केवल बड़े देशों पर लागू है न कि छोटे देशों पर? स्पष्ट कीजिए।
Practise this question Trade Policy, Protection and the WTO notes
Model answer
Paper and question: Paper I, Q7(a)
Approach: Define the optimal tariff, derive t* = 1/(e* − 1), show why it is zero for a small country (infinitely elastic foreign supply) and positive for a large one, with the welfare diagram, and note retaliation.
The optimal tariff is the tariff that maximises a country's national welfare by balancing the terms-of-trade gain against the efficiency loss. Its formula is t* = 1/(e* − 1), where e* is the elasticity of the foreign export supply (or of the foreign offer curve).
Small country: it is a price taker; foreign supply is perfectly elastic (e* infinite), so t* = 0. A tariff cannot lower the world price; the whole tariff falls on domestic consumers, and the only effect is the deadweight loss (b + d). Free trade is optimal.
Large country: its imports are a significant share of world demand, so a tariff reduces world demand and lowers the price foreign exporters receive; part of the tariff is borne by foreigners. The terms-of-trade gain (e) rises with the tariff at first while the deadweight loss rises with its square; the optimal tariff is where the marginal gain equals the marginal loss. Since e* is finite, t* is positive; the less elastic the foreign supply, the higher t*.
Diagram: net welfare against the tariff rate is an inverted U, zero at free trade, rising to a maximum at t*, falling and becoming negative at higher rates up to the prohibitive tariff; in offer-curve terms, the optimal tariff makes the tariff-ridden home offer curve cut the foreign offer curve where it is tangent to the highest home trade indifference curve.
The gain is at the expense of trading partners, so world welfare falls, and partners may retaliate, leaving both worse off (a tariff war); this is why the WTO binds tariffs.
Q7(b) · Money and Monetary Management · 15 marks≈ 11 min
Keynes and Post-Keynesian Theories of Demand for Money
Keynesian demand for money is one of the key concepts of Keynesian theory of unemployment. Illustrate.
हिंदी में प्रश्न
मुद्रा के लिए कींसवादी माँग, बेरोज़गारी की कींसवादी थियोरी की कुंजी संकल्पनाओं में से एक है। उदाहरण देते हुए स्पष्ट कीजिए।
Practise this question Money and Monetary Management notes
Model answer
Paper and question: Paper I, Q7(b)
Approach: Set out Keynes' three motives and L = L₁(Y) + L₂(r), then show how liquidity preference fixes the interest rate, links money to investment and income, and through the liquidity trap can prevent full employment.
In the General Theory (1936), Keynes made the demand for money, which he called liquidity preference, a central element of his theory of employment, replacing the classical view that the interest rate equates saving and investment.
Demand for money: people hold money for (i) transactions and (ii) precautionary motives, both depending on income, L₁(Y); and (iii) the speculative motive, holding money in place of bonds when they expect interest rates to rise, which depends inversely on the interest rate, L₂(r). Total demand L = L₁(Y) + L₂(r).
Role in the theory of unemployment: (i) the interest rate is determined by liquidity preference and the money supply, not by thrift; (ii) investment depends on the interest rate relative to the marginal efficiency of capital, and income depends on investment through the multiplier; so money affects employment only indirectly, through the rate of interest. (iii) When unemployment lowers wages and prices, real balances rise and the interest rate should fall, stimulating investment (the Keynes effect). But if speculative demand is highly elastic, the interest rate falls little, and in the liquidity trap not at all, so investment cannot rise enough and an underemployment equilibrium persists. (iv) Shifts in liquidity preference caused by uncertainty can raise interest rates and depress investment in a slump.
Diagram: left panel, money demand curve with a flat section at r_min and money supply lines; right panel, IS-LM with a flat LM cutting IS below full-employment income.
Q7(c) · Economic Development · 20 marks≈ 14 min
Trade, Foreign Investment and Multinationals in Development
Can multinational investment defeat the objective of inclusive growth? Give reasons for your answer.
हिंदी में प्रश्न
क्या बहुराष्ट्रीय निवेश, समावेशी संवृद्धि के उद्देश्य को विफल कर सकता है? अपने उत्तर के पक्ष में कारण प्रस्तुत कीजिए।
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q7(c)
Approach: Define inclusive growth, then argue both ways: how MNC investment can undermine inclusion (capital intensity, crowding out, regional and skill bias, profit outflow, tax avoidance) and how it can support it; conclude that outcomes depend on policy.
Inclusive growth means growth that is broad-based across sectors, regions and social groups, creates productive employment and reduces poverty and inequality; India's Eleventh Plan (2007–12) made it the central objective.
Yes, MNC investment can defeat it: (i) MNCs often use capital- and skill-intensive technology, creating few jobs for the unskilled and raising the skill premium; (ii) they may crowd out small domestic firms and artisans through superior brands and finance, as feared in retail; (iii) investment concentrates in a few states and cities with good infrastructure, widening regional disparities; (iv) profit repatriation, royalties and transfer pricing drain resources, and tax avoidance erodes the revenue needed for social spending; (v) in extractive sectors, displacement of tribal communities and environmental damage hurt the poor; (vi) market power can raise prices, as with some patented medicines.
But MNCs can also support inclusion: they create direct and indirect jobs (India's automobile and electronics assembly, IT services), bring technology and skills that spill over to local suppliers, integrate local firms into global value chains and pay taxes. Their effect depends on linkages with domestic firms and the host country's absorptive capacity.
Policy matters: directing FDI to labour-intensive manufacturing and backward regions, building supplier linkages and skills, enforcing competition and tax law (including the global minimum tax), and protecting land rights and the environment.
Hence multinational investment does not by itself guarantee or defeat inclusive growth; it can defeat it where it is enclave-type and capital-intensive, and promote it where policy ensures linkages, jobs and fair taxation.

Question 8 (50 marks)

Q8(a) · Theories of Employment, Income and Interest · 15 marks≈ 11 min
IS-LM Model and the Neo-classical Synthesis
What makes monetary policy ineffective even in the short run? Explain.
हिंदी में प्रश्न
मौद्रिक नीति, अल्पकाल में भी, किस कारण निष्फल हो जाती है? स्पष्ट कीजिए।
Practise this question Theories of Employment, Income and Interest notes
Model answer
Paper and question: Paper I, Q8(a)
Approach: List the conditions under which an expansionary monetary policy fails to raise output even in the short run (liquidity trap, interest-inelastic investment, broken transmission, open-economy and expectations channels), each with its IS-LM logic and an example.
Monetary policy normally works by lowering interest rates and raising credit, investment and output. In several situations this chain breaks even in the short run.
1. Liquidity trap: when interest rates are already very low (or at the zero lower bound), extra money is hoarded; the LM curve is flat and an increase in M does not lower r (Keynes, 1936; Japan in the 1990s, the US and Europe after 2008).
2. Interest-inelastic investment: in a deep slump, with excess capacity and pessimistic expectations, investment does not respond to lower rates; the IS curve is steep or vertical, so a falling r leaves output unchanged.
3. Weak transmission through banks: if banks carry large bad loans or face weak demand, they do not pass on rate cuts or expand credit (a credit crunch); in India, high NPAs around 2016–19 weakened transmission of repo rate cuts, which led RBI to mandate external-benchmark lending rates from October 2019.
4. Open economy with fixed exchange rates and capital mobility: in the Mundell-Fleming model, a monetary expansion causes capital outflows; to defend the peg the central bank must reverse it, so policy is ineffective.
5. Rational expectations: new classical economists (Sargent and Wallace, 1975) argue that fully anticipated monetary changes raise only prices, since wages and prices adjust immediately.
Diagram: IS-LM with a flat LM segment where LM₁ to LM₂ leaves equilibrium unchanged, and a vertical IS where an LM shift lowers r but not Y.
In such conditions fiscal policy, credit guarantees or balance-sheet repair are needed alongside monetary easing.
Q8(b) · Theories of International Trade · 20 marks≈ 14 min
Trade as an Engine of Growth and Theories of Underdevelopment
Trade can be growth-promoting or growth-inhibiting. Argue in terms of the established theories.
हिंदी में प्रश्न
व्यापार संवृद्धि-उन्नायक या संवृद्धि-निरोधक हो सकता है। संस्थापित थियोरियों की दृष्टि से तर्क कीजिए।
Practise this question Theories of International Trade notes
Model answer
Paper and question: Paper I, Q8(b)
Approach: Present growth-promoting theories (classical gains, vent for surplus, engine of growth, new trade and endogenous growth, export-led evidence) and growth-inhibiting theories (Prebisch-Singer, Myrdal's backwash, dependency, immiserising growth, Dutch disease), then conclude on conditions.
Whether trade promotes or inhibits growth depends on what a country trades and on its domestic conditions; established theories support both views.
Growth-promoting: (i) Ricardo and Heckscher-Ohlin: specialisation by comparative advantage raises real income; (ii) Adam Smith's and Hla Myint's (1958) vent for surplus: exports mobilise idle land and labour; (iii) Robertson's engine of growth: demand from industrial centres pulled nineteenth-century settlement economies; (iv) dynamic gains: larger markets and scale economies, imports of capital goods and technology, learning by doing, FDI and competition; (v) endogenous growth theory (Grossman and Helpman, 1991): trade spreads knowledge and raises the returns to innovation. Evidence: export-led growth of Japan, Korea, Taiwan and China; India's acceleration after 1991.
Growth-inhibiting: (i) the Prebisch-Singer thesis (1950): developing countries specialising in primary goods face secular decline in their terms of trade, because of low income elasticity of demand and market power in industrial countries; (ii) Myrdal's backwash effects (1957): trade concentrates gains in rich centres; (iii) dependency theory (Frank; Emmanuel's unequal exchange): trade locks the periphery into underdevelopment; (iv) Bhagwati's immiserising growth (1958): export-biased growth with inelastic demand can lower welfare; (v) Dutch disease and the resource curse: commodity booms appreciate the currency and crowd out manufacturing; (vi) Nurkse's export pessimism and the volatility of primary-product prices.
Reconciliation: trade has promoted growth where countries diversified into manufactures and services with rising demand, invested in skills and infrastructure and managed exchange rates, as East Asia did; it has inhibited growth where countries remained dependent on a few primary commodities with weak institutions.
Hence trade is not automatically good or bad: Kravis's view of trade as a 'handmaiden' of growth, effective when domestic policies are sound, best summarises the evidence.
Q8(c) · Economic Development · 15 marks≈ 11 min
Myrdal, Kuznets and Structural Change; Role of Agriculture
What are the causes of market failure in agriculture? How may government intervention mitigate this?
हिंदी में प्रश्न
कृषि में बाज़ार विफलता के क्या-क्या कारण हैं? सरकारी मध्यस्थता इसकी तीव्रता को किस प्रकार कम कर सकती है?
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q8(c)
Approach: List the sources of market failure in agriculture (price instability, risk and missing markets, information, externalities, public goods, market power), then match each with government interventions, noting the risk of government failure.
Market failure occurs when free markets do not allocate resources efficiently. Agriculture is especially prone to it because of its biological, seasonal and dispersed nature.
Causes: (i) price instability: inelastic demand and supply that responds to past prices create cobweb cycles and sharp price swings; (ii) risk and missing markets: weather and pest shocks, with poorly developed insurance and futures markets; (iii) imperfect credit markets: lack of collateral and information leads to rationing and dependence on moneylenders; (iv) information asymmetry about input quality (spurious seeds) and prices; (v) externalities: groundwater depletion, chemical run-off and stubble burning; (vi) public goods: research, extension and irrigation are under-supplied privately; (vii) market power: traders and commission agents in thin local markets can exploit dispersed small farmers.
Interventions: price support and procurement (MSP) and buffer stocks to stabilise prices; crop insurance (PMFBY, 2016) and weather insurance; priority-sector lending, Kisan Credit Cards and NABARD refinance; seed certification, soil health cards and market information through e-NAM (2016); regulation and pricing of water and power, and subsidies for crop-residue machinery; public research (ICAR) and extension; and farmer producer organisations to countervail market power.
But intervention can fail too: MSP and power subsidies have encouraged rice and wheat over-production and groundwater depletion. Interventions should therefore correct specific failures at least cost.

UPSC Mains 2019 Economics Paper II