UPSC Mains 2025 Economics Optional Question Papers with Model Answers

All 56 questions of the 2025 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 2025 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
Show that when prices and income increase in the same proportion, there will be no change in quantity demanded for a commodity in Marshallian approach.
हिंदी में प्रश्न
दर्शाइए कि जब कीमतें और आय समान अनुपात में बढ़ती हैं, तो मार्शेलियन दृष्टिकोण में, किसी वस्तु की माँग की मात्रा में कोई परिवर्तन नहीं होगा।
Practise this question Price Determination and Theories of Distribution notes
Model answer
Paper and question: Paper I, Q1(a)
Approach: Write the Marshallian demand function and budget constraint, show that multiplying all prices and income by λ leaves the budget set and the optimum unchanged, and state the elasticity implication.
The Marshallian (ordinary) demand for good x is the solution of: maximise U(x, y) subject to px·x + py·y = M, giving x* = x(px, py, M).
Step 1: multiply both prices and income by the same λ greater than 0: the constraint becomes λpx·x + λpy·y = λM.
Step 2: dividing through by λ returns px·x + py·y = M; the budget line has the same intercepts M/px and M/py and the same slope −px/py.
Step 3: since preferences (the indifference map) are unchanged, the same bundle maximises utility, so x(λpx, λpy, λM) = x(px, py, M).
Result: Marshallian demand is homogeneous of degree zero in prices and income: the consumer has no money illusion and responds only to relative prices and real income.
Implication: by Euler's theorem, the own-price elasticity, the cross-price elasticity and the income elasticity sum to zero: eₓₓ + eₓᵧ + eₓM = 0. For example, if the own-price elasticity is −1.2 and the income elasticity is 1.0, the cross elasticity must be 0.2.
Diagram: x on the horizontal and y on the vertical axis; the budget line AB with tangency to indifference curve IC at E; after the proportional rise the budget line is still AB, so E is unchanged.
The result fails if consumers suffer money illusion, or if income is held in assets whose real value changes with prices, which is why the property is a test of rational choice.
Q1(b) · Theories of Employment, Income and Interest · 10 marks≈ 7 min
IS-LM Model and the Neo-classical Synthesis
Interpret the slope of the IS curve. Why is IS curve normally negatively sloped?
हिंदी में प्रश्न
IS वक्र की ढलान की व्याख्या कीजिए। IS वक्र सामान्यतः ऋणात्मक ढलान वाला क्यों होता है?
Practise this question Theories of Employment, Income and Interest notes
Model answer
Paper and question: Paper I, Q1(b)
Approach: Derive the slope of IS, dr/dY = −[1 − c(1 − t)]/b, explain the economic logic of the negative slope, and state what makes it steep or flat.
The IS curve (Hicks, 1937) is the locus of combinations of income Y and interest rate r at which the goods market is in equilibrium: planned investment equals planned saving (I = S, or Y = C + I + G).
Slope: with C = a + c(1 − t)Y and I = I₀ − br, equilibrium gives Y = [a + I₀ + G − br]/[1 − c(1 − t)]. Hence dr/dY = −[1 − c(1 − t)]/b. The slope shows how much the interest rate must fall to support one more unit of income in goods-market equilibrium.
Why negative: a lower interest rate lowers the cost of borrowing, so investment rises; through the multiplier, income rises until the extra saving equals the extra investment. So lower r goes with higher Y.
Steepness: IS is flatter when investment is more interest-sensitive (large b) and the multiplier is larger (high c, low t); it is steep or vertical when investment is interest-inelastic, as in a deep slump.
Diagram: r on the vertical and Y on the horizontal axis; a downward IS; points r₁ and r₂ (lower) correspond to Y₁ and Y₂ (higher).
Q1(c) · Theories of Employment, Income and Interest · 10 marks≈ 7 min
Classical Theory of Employment and Output
What is classical dichotomy? Is it the same as neutrality of money? Explain.
हिंदी में प्रश्न
प्रतिष्ठित द्विभाजन क्या है? क्या यह मुद्रा की तटस्थता के समान है? समझाइए।
Practise this question Theories of Employment, Income and Interest notes
Model answer
Paper and question: Paper I, Q1(c)
Approach: Define the classical dichotomy and neutrality of money, show how the dichotomy implies neutrality, then explain why they are not the same (Patinkin's invalid dichotomy; neutrality without dichotomy).
The classical dichotomy is the separation of the economy into a real sector and a monetary sector: relative prices, output, employment, real wages and the real interest rate are determined by real forces (tastes, technology, resources) in the goods and labour markets, while money determines only the absolute price level through the quantity theory.
Neutrality of money means that a change in the money supply changes nominal variables (prices, money wages) proportionately and leaves real variables unchanged.
Relation: the dichotomy implies neutrality: if real variables are determined without reference to money, a change in money can affect only nominal ones.
Not the same: the dichotomy is a property of a model's structure, neutrality a comparative-static result. Patinkin (Money, Interest and Prices, 1956) showed the classical dichotomy is invalid, since the price level is determinate only if real balances M/P enter real demand; yet money remains neutral in his model, because doubling M doubles P. Neutrality can thus hold without a dichotomy.
Q1(d) · Welfare Economics · 10 marks≈ 7 min
Market Failure: Externalities, Public Goods and Asymmetric Information
What are the major reasons for market failure? Explain the role of the government in this context.
हिंदी में प्रश्न
बाज़ार की विफलता के प्रमुख कारण क्या हैं? इस संदर्भ में सरकार की भूमिका की व्याख्या कीजिए।
Practise this question Welfare Economics notes
Model answer
Paper and question: Paper I, Q1(d)
Approach: List the main sources of market failure (public goods, externalities, asymmetric information, market power, incomplete markets) with one line each, then the corresponding government roles with Indian examples.
Market failure occurs when a free market fails to allocate resources efficiently, i.e. the outcome is not Pareto optimal (Francis Bator, 'The Anatomy of Market Failure', 1958).
Reasons: (i) public goods, non-rival and non-excludable, are under-provided because of free riding; (ii) externalities: when private and social costs or benefits differ, as with pollution or vaccination, output is too high or too low; (iii) asymmetric information causes adverse selection and moral hazard (Akerlof, 1970); (iv) market power (monopoly) restricts output and sets price above marginal cost; (v) incomplete markets, e.g. for long-term credit or insurance for small farmers.
Role of government: (i) direct provision of public goods financed by taxes; (ii) Pigouvian taxes, subsidies, standards or tradable permits for externalities, e.g. India's Carbon Credit Trading Scheme (2023); (iii) disclosure rules and regulators for information problems (SEBI, IRDAI); (iv) competition law (Competition Act, 2002) and regulation of natural monopolies; (v) institutions that fill missing markets, such as crop insurance.
Government action must weigh government failure (rent-seeking, poor information) against market failure.
Q1(e) · Money and Monetary Management · 10 marks≈ 7 min
Quantity Theories of Money: Fisher, Cambridge (Pigou) and Friedman
What are the determinants of velocity of money in Fisher's equation? How does it differ from the Cambridge version of velocity of money?
हिंदी में प्रश्न
फिशर के समीकरण में मुद्रा संचलन-वेग के निर्धारक क्या हैं? यह कैम्ब्रिज दृष्टिकोण के मुद्रा संचलन-वेग से किस प्रकार भिन्न है?
Practise this question Money and Monetary Management notes
Model answer
Paper and question: Paper I, Q1(e)
Approach: List the institutional determinants of V in Fisher's MV = PT, then contrast with the Cambridge k (= 1/V) as a behavioural choice about holding money.
In Irving Fisher's equation of exchange (The Purchasing Power of Money, 1911), MV + M′V′ = PT, V is the transactions velocity: the average number of times a unit of money changes hands in a period.
Determinants of V: payment habits and the frequency of income receipts (weekly wages raise V); the development of banking and credit, which economises on cash; the degree of vertical integration of firms; density of population and speed of transport and communication; and expectations of price changes.
Since these change slowly, Fisher treated V as constant in the short run.
Cambridge version (Marshall; Pigou, 1917): M = kPY, where k is the share of income people wish to hold as money, so k = 1/V. But Fisher's V is a mechanical, institutional turnover rate applied to all transactions T, while k is a behavioural demand for money relative to final income, depending on wealth, interest rates and expectations, and stresses money as a store of value.

Question 2 (50 marks)

Q2(a) · Price Determination and Theories of Distribution · 20 marks≈ 14 min
Consumer, Production and Cost Theory: Foundations
Derive Marshallian demand curve for an inferior good in a two-commodity framework by using income and substitution effects. Is this demand curve always negatively sloped? Explain.
हिंदी में प्रश्न
आय और प्रतिस्थापन प्रभाव का उपयोग करते हुए दो-वस्तु ढाँचे (फ्रेमवर्क) में एक निम्न वस्तु के लिए मार्शेलियन माँग वक्र व्युत्पन्न कीजिए। क्या यह माँग वक्र हमेशा ऋणात्मक ढलान वाला होता है? समझाइए।
Practise this question Price Determination and Theories of Distribution notes
Model answer
Paper and question: Paper I, Q2(a)
Approach: Use the indifference-curve diagram for a fall in the price of the inferior good, split the movement into substitution and income effects (Hicks), derive the demand curve, and show it slopes upward only in the Giffen case, using the Slutsky equation.
An inferior good has a negative income effect, e.g. coarse grains for poor households. The Marshallian demand curve shows the total effect of a price change, which Hicks (Value and Capital, 1939) split into substitution and income effects.
Derivation: with two goods X (inferior) and Y, the consumer is initially at E1 where budget line AB touches indifference curve IC1. Let the price of X fall: the budget line pivots outward to AB′ and the new optimum is E2 on IC2.
Substitution effect: draw a compensating budget line parallel to AB′ tangent to the old curve IC1 at E3. The move E1 to E3 is always an increase in X, since X is now relatively cheaper and indifference curves are convex: the substitution effect is negative (quantity moves opposite to price).
Income effect: the move E3 to E2 reflects the rise in real income. For an inferior good it reduces the quantity of X, so it works against the substitution effect.
Diagram: X on the horizontal and Y on the vertical axis; budget lines AB and AB′, compensating line CD parallel to AB′; tangencies E1 (IC1), E3 (IC1) and E2 (IC2); E2 lies to the right of E1 but to the left of E3; below, plot the prices of X against the quantities at E1 and E2 to obtain a downward-sloping demand curve.
Is it always negatively sloped? No. By the Slutsky equation, ∂x/∂px = ∂h/∂px − x·∂x/∂M, the substitution term is always negative, while for an inferior good the income term −x·∂x/∂M is positive. If the substitution effect dominates, demand still slopes down; if the income effect dominates, it slopes up: a Giffen good.
Giffen conditions: the good must be strongly inferior, take a large budget share and have few substitutes; Jensen and Miller (2008) found such behaviour for rice among very poor households in Hunan, China.
Thus every Giffen good is inferior, but not every inferior good is Giffen; the law of demand holds for normal goods and for most inferior goods.
Q2(b) · Market Structures · 15 marks≈ 11 min
Duopoly Models: Cournot, Bertrand, Stackelberg and Edgeworth
Consider a firm in a Duopoly market with product differentiation in which, Duopolist I faces a demand function given by:
p₁ = 200 − 4q₁ − 2q₂
The cost function of Duopolist I is:
c₁ = 5q₁²
Assume that Duopolist II has 1/3rd share of the whole market.
Find out optimal price, output and profit for Duopolist I. Also find out the output of Duopolist II.
हिंदी में प्रश्न
उत्पाद विभेदन के साथ एक द्वैध (डुओपोली) बाज़ार में एक फर्म पर विचार कीजिए, जिसमें द्वैधवादी I को निम्न द्वारा दिए गए माँग फलन का सामना करना पड़ता है :
p₁ = 200 − 4q₁ − 2q₂
द्वैधवादी I का लागत फलन है :
c₁ = 5q₁²
मान लीजिए कि द्वैधवादी II के पास पूरे बाज़ार का 1/3 हिस्सा है।
द्वैधवादी (डुओपोलिस्ट) I के लिए इष्टतम मूल्य, उत्पादन और लाभ का पता लगाइए। द्वैधवादी II का उत्पादन (आउटपुट) भी पता लगाइए।
Practise this question Market Structures notes
Model answer
Paper and question: Paper I, Q2(b)
Approach: Interpret 'one-third share' as Duopolist II keeping q₂ = q₁/2, substitute into Duopolist I's demand, set MR = MC, and compute price, outputs and profit; check the second-order condition.
With differentiated products, Duopolist I's price depends on both outputs. The problem states that Duopolist II holds one-third of the whole market; the natural reading is a constant market-share conjecture (as in Chamberlin's share-of-the-market demand): Duopolist I expects II to keep its share, so q₂ always adjusts to one-third of total output.
Step 1: q₂ = (1/3)(q₁ + q₂) gives 3q₂ = q₁ + q₂, so q₂ = q₁/2.
Step 2: substitute into the demand: p₁ = 200 − 4q₁ − 2(q₁/2) = 200 − 5q₁.
Step 3: total revenue TR₁ = 200q₁ − 5q₁², so MR₁ = 200 − 10q₁; marginal cost MC₁ = dc₁/dq₁ = 10q₁.
Step 4: MR₁ = MC₁ gives 200 − 10q₁ = 10q₁, so q₁ = 10. Second-order condition: slope of MR (−10) is less than slope of MC (+10), so this is a maximum.
Step 5: p₁ = 200 − 5(10) = 150. Check with the original demand: 200 − 4(10) − 2(5) = 150.
Step 6: profit π₁ = TR − TC = 150 × 10 − 5(10)² = 1,500 − 500 = 1,000; output of Duopolist II, q₂ = 10/2 = 5.
Result: Duopolist I maximises profit at an output of 10 units and a price of 150, earning a profit of 1,000, while Duopolist II produces 5 units, one-third of the total market output of 15 units.
Interpretation: because Duopolist I expects its rival to expand in step with it, its perceived demand (slope −5) is steeper than its demand with q₂ fixed (slope −4), so it restricts output more than a Cournot firm would; this is why the share assumption matters. If q₂ were instead fixed at 5 (Cournot conjecture), MR₁ = 190 − 8q₁ = 10q₁ would give q₁ = 10.56, showing that the conjecture changes the result. The rising marginal cost (c₁ = 5q₁²) also limits the firm's output, and the high price relative to marginal cost (150 against 100) reflects the market power that product differentiation gives.
Q2(c) · Welfare Economics · 15 marks≈ 11 min
Compensation Criteria: Kaldor, Hicks, Scitovsky and Little
What is Scitovsky Paradox? Explain it in the context of Kaldor-Hicks compensation test.
हिंदी में प्रश्न
स्किटोव्स्की विरोधाभास क्या है? इसे काल्डोर-हिक्स क्षतिपूर्ति परीक्षण के संदर्भ में समझाइए।
Practise this question Welfare Economics notes
Model answer
Paper and question: Paper I, Q2(c)
Approach: State the Kaldor-Hicks test, show with crossing utility possibility curves how it can approve a move from A to B and also the reverse move, and give Scitovsky's double criterion as the remedy.
Kaldor-Hicks test: Kaldor (1939) and Hicks (1939) held that a move from A to B is an improvement if the gainers could compensate the losers and still be better off, even if compensation is not paid.
Scitovsky paradox (Tibor Scitovsky, 'A Note on Welfare Propositions in Economics', Review of Economic Studies, 1941): the test can give contradictory verdicts. A move from A to B may pass the test, and the reverse move from B back to A may also pass it, so each state is judged better than the other.
Reason: a change in policy also changes the bundle of goods produced and its distribution, so each state has its own utility possibility curve (UPC). If the UPCs through A and B intersect, then from B redistribution along UPC_B can reach a point that dominates A, while from A redistribution along UPC_A can reach a point that dominates B.
Diagram: UA on the horizontal and UB on the vertical axis; two intersecting UPCs, UPC_A through A and UPC_B through B; B′ on UPC_B lies north-east of A, so B passes Kaldor-Hicks against A; A′ on UPC_A lies north-east of B, so A passes against B.
Scitovsky double criterion: B is better than A only if (i) the gainers could compensate the losers in moving to B (Kaldor-Hicks) and (ii) the losers could not bribe the gainers to oppose the move (the reversal test fails). This removes the contradiction.
Limits: even the double criterion ignores distribution and can be intransitive across three states (Gorman, 1955); Little (1950) added a distributional test.

Question 3 (50 marks)

Q3(a) · Theories of Employment, Income and Interest · 20 marks≈ 14 min
IS-LM Model and the Neo-classical Synthesis
Define liquidity trap. Show that fiscal policy is fully effective in the horizontal part while the monetary policy is fully effective in the vertical part of the LM curve. Illustrate your answer graphically with economic reasons.
हिंदी में प्रश्न
तरलता जाल को परिभाषित कीजिए। दर्शाइए कि राजकोषीय नीति LM वक्र के क्षैतिज भाग में पूरी तरह से प्रभावी है जबकि मौद्रिक नीति ऊर्ध्वाधर भाग में पूरी तरह से प्रभावी है। आर्थिक कारण देते हुए अपने उत्तर को आलेख द्वारा समझाइए।
Practise this question Theories of Employment, Income and Interest notes
Model answer
Paper and question: Paper I, Q3(a)
Approach: Define the liquidity trap, divide the LM curve into Keynesian (flat), intermediate and classical (vertical) ranges, and show with shifts of IS and LM why fiscal policy works fully in the flat range and monetary policy in the vertical range.
A liquidity trap (Keynes, 1936; the term is due to Dennis Robertson) is a situation in which the interest rate is so low that everyone expects it to rise and bond prices to fall, so the speculative demand for money becomes perfectly elastic: any additional money is held idle and the interest rate cannot fall further.
Shape of LM: the LM curve has slope k/h. In the trap h is infinite, so LM is horizontal at the minimum rate (Keynesian range). At high interest rates speculative balances are zero and money demand depends only on income (h = 0), so LM is vertical (classical range). In between it slopes upward.
Fiscal policy in the horizontal range: a rise in G shifts IS to the right. Extra income raises the transactions demand for money, but this is met from idle speculative balances without any rise in the interest rate. Investment is not crowded out, so income rises by the full Keynesian multiplier ΔG/(1 − c). Monetary policy here is useless: an increase in M only adds to idle balances, and LM does not shift in the flat part.
Monetary policy in the vertical range: all money is held for transactions, so an increase in M must be spent: people buy bonds, the interest rate falls, investment rises and income rises by the full amount ΔY = ΔM/k, as in the quantity theory. Fiscal policy here is useless: a rise in G raises the interest rate until private investment falls by exactly ΔG (complete crowding out), because income cannot rise without more money.
Diagram: r on the vertical and Y on the horizontal axis; an LM curve flat at r_min, then rising, then vertical at Y_c; IS₁ to IS₂ in the flat range raises Y at the same r; IS₃ to IS₄ in the vertical range raises only r; LM₁ to LM₂ (rightward in the vertical part) raises Y where IS cuts the vertical part, but leaves the flat part unchanged.
Q3(b) · Theories of Employment, Income and Interest · 15 marks≈ 11 min
Theories of Interest Rate Determination and the Term Structure
How does the loanable fund theory become superior to the classical theory of interest?
हिंदी में प्रश्न
ऋणयोग्य निधि (लोनेबिल फंड) सिद्धांत, ब्याज के प्रतिष्ठित सिद्धांत से किस प्रकार श्रेष्ठ होता है?
Practise this question Theories of Employment, Income and Interest notes
Model answer
Paper and question: Paper I, Q3(b)
Approach: Summarise the classical (real) theory and its defects, set out the loanable funds theory (Wicksell, Robertson, Ohlin) with its demand and supply components, show why it is superior with a diagram, and note its own limitations.
The classical theory (Marshall, Pigou, Fisher) holds that the rate of interest is determined by the real forces of thrift and productivity: it equates the supply of savings with the demand for investment. It is a purely real theory, ignores money and assumes full employment.
The loanable funds theory (neo-classical theory), associated with Wicksell, Robertson, Ohlin and Viner, holds that the interest rate is the price that equates the demand for and supply of loanable funds, which include monetary as well as real elements.
Supply of loanable funds: (i) saving S; (ii) dishoarding of past idle cash balances (DH); (iii) net new bank credit or money creation (ΔM); (iv) disinvestment (DI). Demand: (i) investment I; (ii) hoarding of money as idle balances (H); (iii) dissaving or consumption borrowing (DS).
Why superior: (i) it is a monetary as well as real theory: bank credit and hoarding influence the interest rate, consistent with the observation that central-bank actions affect rates; (ii) it allows saving and investment to differ in the short run, with the gap filled by credit creation and dishoarding (Robertson's period analysis); (iii) it recognises the demand for money for holding, anticipating Keynes's liquidity preference; (iv) it explains why the market rate can diverge from the 'natural' rate (Wicksell), causing cumulative inflation or deflation; (v) it is closer to how financial markets actually work.
Diagram: interest rate on the vertical axis and loanable funds on the horizontal; S and S + DH + ΔM curves rising; I and I + H curves falling; the classical rate where S = I is higher than the loanable funds rate where (S + DH + ΔM) = (I + H) when new credit exceeds hoarding.
Q3(c) · Theories of Employment, Income and Interest · 15 marks≈ 11 min
Keynesian Theory of Income and Employment
"The failure of classical full employment equilibrium paved the way for Keynes' theory of underemployment equilibrium." Discuss critically.
हिंदी में प्रश्न
"प्रतिष्ठित पूर्ण रोजगार संतुलन की विफलता ने कीन्स के अल्परोजगार संतुलन के सिद्धांत का मार्ग प्रशस्त किया।" आलोचनात्मक विवेचना कीजिए।
Practise this question Theories of Employment, Income and Interest notes
Model answer
Paper and question: Paper I, Q3(c)
Approach: Explain how the Great Depression exposed the classical mechanisms, set out Keynes' alternative (effective demand, underemployment equilibrium), and then critically assess it (Pigou effect, neoclassical synthesis, role of rigidities).
Classical failure: the classical model predicted that flexible wages, Say's law and the interest rate would keep the economy at full employment. The Great Depression (1929–33), when US unemployment reached about a quarter of the labour force and money wages and prices fell sharply without restoring employment, contradicted this.
Keynes' theory (General Theory, 1936): (i) employment depends on effective demand, the point where aggregate demand equals aggregate supply; (ii) saving and investment are equated by changes in income, not by the interest rate, so an excess of planned saving lowers income; (iii) the interest rate is set by liquidity preference and money supply, and investment depends on volatile expectations (marginal efficiency of capital); (iv) wage cuts lower incomes and demand, so they need not cure unemployment. Equilibrium can thus persist below full employment, with involuntary unemployment.
Diagram: Keynesian cross with income on the horizontal axis and expenditure on the vertical; C + I + G cutting the 45-degree line at Ye, left of full-employment output Yf; the vertical gap at Yf is the deflationary gap.
Critical assessment: Pigou (1943) and Patinkin (1956) argued that falling prices raise real balances and consumption (the real balance effect), so with full flexibility unemployment is not a true equilibrium; Keynes' result rests on rigid wages, a liquidity trap or interest-inelastic investment, which is how the neoclassical synthesis (Hicks, 1937; Modigliani, 1944) read him. Yet the real balance effect is weak, and deflation raises the real burden of debt (Fisher, 1933), so Keynes' case for active demand management remains valid, as the responses of 2008 and 2020 show.

Question 4 (50 marks)

Q4(a) · Public Finance · 20 marks≈ 14 min
Public Expenditure: Growth Theories and Effects
(i) Explain the effects of public spending on national income, if it is financed through government borrowings.
(ii) Why do some believe that it is important to restrict the growth of public expenditure? Suggest how public expenditure might be controlled.
हिंदी में प्रश्न
(i) राष्ट्रीय आय पर सार्वजनिक व्यय के प्रभावों की व्याख्या कीजिए, यदि इसे सरकारी उधार के माध्यम से वित्तपोषित किया जाता है।
(ii) कुछ लोग क्यों मानते हैं कि सार्वजनिक व्यय की वृद्धि को सीमित करना महत्त्वपूर्ण है? सुझाव दीजिए कि सार्वजनिक व्यय को कैसे नियंत्रित किया जा सकता है।
Practise this question Public Finance notes
Model answer
Paper and question: Paper I, Q4(a)
Approach: (i) Trace the effect of borrowing-financed spending through the multiplier, interest rates and crowding out (IS-LM), including the source of borrowing; (ii) give the arguments for restricting public expenditure growth (Wagner, Peacock-Wiseman, public choice) and methods of control.
(i) Debt-financed public spending raises aggregate demand without cutting disposable income, so in the Keynesian model income rises by the full multiplier, ΔY = ΔG/(1 − c), larger than the balanced-budget multiplier of 1. The final effect depends on how the borrowing is financed.
Borrowing from the public raises interest rates and causes partial crowding out of private investment; the effect is small in a recession with idle saving and large near full employment. Borrowing from the central bank (monetisation) expands the money supply, so interest rates need not rise and output rises more, but at full employment it causes inflation. Under Ricardian equivalence (Barro, 1974) households save in anticipation of future taxes, weakening the effect.
Diagram: IS shifts right from IS1 to IS2; with bond finance LM stays put, so r rises and Y rises from Y₀ to Y₁, less than the horizontal shift; with money finance LM also shifts right and Y rises further, to Y₂.
(ii) Many argue for restraint because public spending tends to grow faster than income, as observed by Adolph Wagner (law of increasing state activity) and by Peacock and Wiseman (1961), who found that spending rises in steps during wars and crises and does not return to the old level (the displacement effect). Public choice theorists (Buchanan, Niskanen) add that bureaucrats maximise budgets and politicians prefer spending to taxes, so spending exceeds the efficient level. Excessive spending raises deficits and debt, crowds out private investment, raises future taxes and may be inefficient.
Methods of control: fiscal rules (India's FRBM Act, 2003, with its targets for deficits and debt); expenditure ceilings and medium-term expenditure frameworks; zero-based budgeting and outcome budgeting (India's Outcome Budget from 2005); rationalising subsidies through direct benefit transfer; reforms suggested by the Expenditure Management Commission (2014, chaired by Bimal Jalan); and independent audit by the CAG and parliamentary committees.
Restraint should target unproductive spending, not capital or social spending that raises growth.
Q4(b) · Public Finance · 15 marks≈ 11 min
Taxation: Sources of Revenue, Forms, Incidence and Effects
(i) Suppose that the market demand and supply functions are given by:
Qd = −500P + 5000
and Qs = 400P − 400
Find out the effects of imposition of specific sales tax of 18% on equilibrium price and quantity.
(ii) In a monopoly market, the demand and cost curves are given by:
p = 200 − 8q
and c = 25 + 10q
Suppose that the government imposes a tax of ₹10 per unit. How will equilibrium price and quantity be affected?
हिंदी में प्रश्न
(i) मान लीजिए कि बाज़ार की माँग और आपूर्ति फलन इस प्रकार दिए गए हैं :
Qd = −500P + 5000
एवं Qs = 400P − 400
18% के विशिष्ट बिक्री कर के लागू होने से, संतुलन मूल्य एवं मात्रा पर पड़ने वाले प्रभावों का पता लगाइए।
(ii) एकाधिकार बाज़ार में, माँग और लागत वक्र इस प्रकार दिए गए हैं :
p = 200 − 8q
एवं c = 25 + 10q
मान लीजिए कि सरकार ₹10 प्रति इकाई का कर लगाती है। संतुलन मूल्य एवं मात्रा पर इसका क्या प्रभाव पड़ेगा?
Practise this question Public Finance notes
Model answer
Paper and question: Paper I, Q4(b)
Approach: Solve both parts step by step: (i) find the pre-tax equilibrium, insert the tax as a wedge between the buyer's and the seller's price and compare; (ii) equate MR with MC before and after the per-unit tax.
(i) A sales tax drives a wedge between the price paid by buyers (P) and the price received by sellers (Ps); quantity is read from demand at P and from supply at Ps.
Step 1 (pre-tax): −500P + 5000 = 400P − 400, so 900P = 5400, P = ₹6 and Q = 5000 − 3000 = 2000 units.
Step 2 (tax of 18% on the seller's price, as with GST): P = 1.18 Ps. Then 5000 − 500P = 400(P/1.18) − 400, i.e. 5400 = P(500 + 338.98), so P = 6372/990 = ₹6.44 (approx.), Ps = 6.44/1.18 = ₹5.45, and Q = 5000 − 500 × 6.436 = 1782 units (approx.). Tax per unit = ₹0.98: buyers bear ₹0.44 and sellers ₹0.55.
Step 3 (if the 18% is read as a specific tax equal to 18% of the original price, t = ₹1.08 per unit): 5000 − 500P = 400(P − 1.08) − 400, so 900P = 5832, P = ₹6.48, Ps = ₹5.40 and Q = 1760 units.
In words: under either reading the price paid rises, the price received falls and quantity falls; the burden is split 4 : 5 between buyers and sellers because the burden ratio equals the ratio of the supply slope to the demand slope (400 : 500), i.e. the side with the less elastic curve bears more.
(ii) TR = 200q − 8q², so MR = 200 − 16q; MC = 10 because TC = 25 + 10q.
Step 4 (before tax): 200 − 16q = 10, so q = 11.875 and p = 200 − 8(11.875) = ₹105; profit = 1246.875 − 143.75 = ₹1103.1.
Step 5 (tax of ₹10 per unit): MC becomes 20, so 200 − 16q = 20, q = 11.25 and p = 200 − 90 = ₹110; tax revenue = ₹112.5 and profit falls to 1237.5 − 250 = ₹987.5.
In words: the monopolist's output falls from 11.875 to 11.25 and price rises by ₹5, exactly half the tax, which is the standard result for linear demand and constant marginal cost; the other half is borne by the monopolist. Unlike a competitive industry, the monopolist cannot pass on the whole tax because raising price further would reduce profit.
Q4(c) · Money and Monetary Management · 15 marks≈ 11 min
Supply of Money and the Money Multiplier
Define money multiplier and discuss its determinants. Explain in terms of money multiplier, how the banking system of an economy can control money supply.
हिंदी में प्रश्न
मुद्रा गुणक को परिभाषित कीजिए एवं इसके निर्धारकों की विवेचना कीजिए। मुद्रा गुणक के संदर्भ में समझाइए कि अर्थव्यवस्था की बैंकिंग व्यवस्था मुद्रा आपूर्ति को कैसे नियंत्रित कर सकती है।
Practise this question Money and Monetary Management notes
Model answer
Paper and question: Paper I, Q4(c)
Approach: Define m = M/H and derive m = (1 + c)/(c + r), discuss the determinants (public's currency ratio, required and excess reserves), then explain how the central bank controls M through H and the reserve ratio.
The money multiplier m is the ratio of the money stock to high-powered money (the monetary base): m = M/H. It shows how many rupees of money are supported by each rupee of reserve money.
Derivation: M = C + D (currency with the public plus deposits) and H = C + R (currency plus bank reserves). With c = C/D and r = R/D, M/H = (C + D)/(C + R) = (c + 1)/(c + r).
Determinants: (i) the currency-deposit ratio c, set by the public's payment habits, banking access, interest on deposits and confidence in banks; a higher c lowers m. (ii) The reserve ratio r, made up of the required ratio (CRR) set by the central bank and excess reserves held by banks, which depend on interest rates, lending opportunities and uncertainty; a higher r lowers m. (iii) Indirectly, the interest rate, which lowers both c and excess reserves.
Control of money supply: since M = m·H, the central bank controls money through (i) H: open market operations, repo lending to banks and foreign exchange operations change the monetary base; (ii) r: changing the CRR changes the multiplier; RBI cut the CRR from 4 per cent to 3 per cent in stages during 2025 to release liquidity. Commercial banks influence M through credit creation and excess reserves; the public through c.

Question 5 (50 marks)

Q5(a) · Theories of International Trade · 10 marks≈ 7 min
Terms of Trade and Offer Curves
Define offer curve and explain its slope.
हिंदी में प्रश्न
प्रस्ताव वक्र को परिभाषित कीजिए और इसकी ढलान को समझाइए।
Practise this question Theories of International Trade notes
Model answer
Paper and question: Paper I, Q5(a)
Approach: Define the offer curve (Marshall-Edgeworth), explain how it is derived and what its slope shows (terms of trade along rays; elastic, unit-elastic and inelastic segments), with a diagram.
An offer curve (reciprocal demand curve), developed by Alfred Marshall and F.Y. Edgeworth from J.S. Mill's reciprocal demand, shows the quantities of exports a country is willing to offer for different quantities of imports at all possible terms of trade. It combines its demand for imports and its supply of exports, and is derived from its PPF and indifference curves (trade triangles) as the terms of trade change.
Slope: the terms of trade at any point are shown by the slope of the ray from the origin to that point. As the terms of trade improve (steeper ray for the country), it offers more exports for more imports, so the curve bends towards its import axis. Along its rising part the country's demand for imports is elastic; where it becomes vertical (or horizontal) demand is unit-elastic; and if it bends backwards, demand is inelastic, the country offering fewer exports for more imports.
Diagram: country A's exports X on the horizontal axis and imports Y on the vertical; A's offer curve rises from the origin, bending towards the Y axis; rays from the origin show different terms of trade.
The intersection with the partner's offer curve fixes the equilibrium terms of trade.
Q5(b) · Balance of Payments and Exchange Rates · 10 marks≈ 7 min
Balance of Payments Adjustment: Elasticity, Absorption and Monetary Approaches
What is J-curve effect? Explain it graphically.
हिंदी में प्रश्न
J-वक्र प्रभाव क्या है? इसे चित्र द्वारा समझाइए।
Practise this question Balance of Payments and Exchange Rates notes
Model answer
Paper and question: Paper I, Q5(b)
Approach: Define the J-curve, explain why the trade balance first worsens and then improves after depreciation (short-run inelasticity, contracts, lags), and draw it.
The J-curve effect describes the time path of a country's trade balance after a depreciation or devaluation: it first worsens and only later improves, tracing a J shape.
Reasons: immediately after depreciation, import and export quantities are fixed by existing contracts and habits, so in the short run demand is inelastic and the Marshall-Lerner condition does not hold. The domestic-currency cost of imports rises at once, while export volumes respond slowly, so the trade balance in domestic currency deteriorates. Over time, as contracts expire, buyers switch to cheaper home goods, and exporters expand capacity and markets, elasticities rise; once the sum of the import demand elasticities exceeds one, the trade balance improves.
Diagram: time on the horizontal axis and the trade balance on the vertical; at the moment of depreciation the curve dips below its initial level, reaches a trough, then rises above the initial level, like the letter J.
Example: the US trade deficit kept widening for about two years after the dollar's depreciation following the Plaza Accord (1985). The J-curve warns that the benefits of depreciation take time and that short-run deterioration should not be mistaken for failure.
Q5(c) · Theories of International Trade · 10 marks≈ 7 min
Comparative Advantage: Ricardo and Heckscher-Ohlin
State Heckscher-Ohlin theory. Explain the Leontief Paradox in this context.
हिंदी में प्रश्न
हेक्स्चर-ओहलिन सिद्धांत बताइए। इस संदर्भ में लियोन्टीफ विरोधाभास की व्याख्या कीजिए।
Practise this question Theories of International Trade notes
Model answer
Paper and question: Paper I, Q5(c)
Approach: State the H-O theorem with its assumptions, then explain Leontief's test and finding and the main explanations of the paradox.
Heckscher-Ohlin theorem (Heckscher, 1919; Ohlin, 1933): a country exports the good that uses intensively its relatively abundant factor and imports the good that uses intensively its scarce factor. It assumes two countries, two goods and two factors, identical technology and tastes, constant returns, perfect competition, and no factor intensity reversal.
Leontief Paradox: Wassily Leontief (1953), using the US input-output table for 1947, compared the capital per worker needed to produce US exports with that needed for import substitutes. Although the US was the most capital-abundant country, its import-competing goods were about 30% more capital-intensive than its exports, the opposite of the H-O prediction.
Explanations: (i) US labour was more productive (Leontief himself suggested about three times), so the US was really labour-abundant in efficiency units; (ii) human capital: US exports were skill-intensive (Kenen, Keesing); (iii) natural resources omitted from the two-factor test; (iv) US tariffs protected labour-intensive industries; (v) factor intensity reversal (Minhas, 1962); (vi) demand biased towards capital-intensive goods.
Later multi-factor tests (Leamer, 1980) reconciled much of the paradox.
Q5(d) · Theories of Growth · 10 marks≈ 7 min
Harrod-Domar Model
Write down the implications of knife-edge problem in Harrod's model of growth.
हिंदी में प्रश्न
हैरोड के संवृद्धि मॉडल में चाकू-धार समस्या के निहितार्थों को लिखिए।
Practise this question Theories of Growth notes
Model answer
Paper and question: Paper I, Q5(d)
Approach: State the knife-edge (instability of the warranted path) briefly and then list its implications for the economy and for policy.
In Harrod's model (1939) steady growth requires the actual rate G to equal the warranted rate Gw = s/Cr. Any deviation is self-reinforcing: if G exceeds Gw, the actual capital-output ratio is below the required Cr, firms invest more and G rises further; if G is below Gw, excess capacity cuts investment and G falls further. This is the knife-edge.
Implications: (i) steady growth is a matter of chance, since the economy is unlikely to stay on the warranted path; (ii) capitalist economies are inherently unstable and prone to cumulative booms and slumps; (iii) a rise in thrift raises Gw and, if G does not follow, leads to depression, a growth version of Keynes's paradox of thrift.
(iv) Because Gw also rarely equals the natural rate Gn, full-employment growth is unlikely without policy, so government must use fiscal and monetary policy to keep G close to Gw.
The knife-edge stimulated later models: Solow (1956) removed it with a variable capital-output ratio, and Kaldor with a variable saving ratio.
Q5(e) · Economic Development · 10 marks≈ 7 min
Measuring Development: Human Development Indices and the Basic Needs Approach
Write down the major limitations of HDI developed by the UNDP.
हिंदी में प्रश्न
यू.एन.डी.पी. द्वारा विकसित एच.डी.आई. की प्रमुख सीमाओं को लिखिए।
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q5(e)
Approach: State the HDI briefly and list its major limitations (coverage, weights and substitutability, inequality, data, sustainability, ranking sensitivity).
The UNDP's Human Development Index (since 1990) is the geometric mean of normalised indices of health (life expectancy), education (mean and expected years of schooling) and income (log of GNI per head, PPP).
Limitations: (i) narrow coverage: it omits freedom, security, employment, gender equality and environment, so it captures only a few capabilities; (ii) averages hide inequality between groups and regions, which is why the inequality-adjusted IHDI was added in 2010; (iii) arbitrary weights and goalposts: equal weights and the chosen minimum and maximum values are not derived from any theory, and they imply trade-offs between longevity and income that Ravallion (2012) found troubling;
(iv) quantity over quality: years of schooling ignore learning, and life expectancy ignores health quality; (v) data problems: outdated or imputed data and PPP revisions change rankings; (vi) no sustainability: high HDI may rest on unsustainable resource use, which the planetary pressures-adjusted HDI (2020) tries to address.
Despite these limits, the HDI remains a useful corrective to GDP.

Question 6 (50 marks)

Q6(a) · Trade Policy, Protection and the WTO · 20 marks≈ 14 min
Tariffs and Quotas: Effects and Comparison
Explain the price effect, protective effect, consumption effect, revenue effect and distributive effect of tariff in partial equilibrium framework.
हिंदी में प्रश्न
आंशिक संतुलन ढाँचे में सीमा-शुल्क (टैरिफ) के मूल्य प्रभाव, संरक्षणात्मक प्रभाव, उपभोग प्रभाव, राजस्व प्रभाव एवं वितरण प्रभाव की व्याख्या कीजिए।
Practise this question Trade Policy, Protection and the WTO notes
Model answer
Paper and question: Paper I, Q6(a)
Approach: Use the partial-equilibrium tariff diagram with labelled areas and explain each effect (price, protective/production, consumption, revenue, redistribution), with the net welfare effect and the role of elasticities.
Consider a small importing country facing a perfectly elastic world supply at price Pw. Under free trade it consumes D₁, produces S₁ and imports D₁ − S₁. An import tariff t is imposed.
Diagram: domestic demand D and supply S; horizontal lines at Pw and Pw + t; production rises from S₁ to S₂ and consumption falls from D₁ to D₂; label area a (between the two price lines left of S₁ above supply), triangle b (S₁ to S₂), rectangle c (S₂ to D₂, the revenue) and triangle d (D₂ to D₁).
Price effect: the domestic price rises from Pw to Pw + t; for a small country by the full tariff, for a large country by less, since the world price falls. Protective (production) effect: domestic output rises from S₁ to S₂, as high-cost domestic producers replace imports; the extra resource cost is triangle b. Consumption effect: consumption falls from D₁ to D₂, causing the loss d. Revenue effect: the government collects t × (D₂ − S₂), area c. Redistributive effect: consumer surplus falls by a + b + c + d, of which a is transferred to producers (higher producer surplus, or economic rent) and c to the government.
Net welfare effect: −(b + d), the deadweight loss. For a large country, the terms-of-trade gain e must be added, so the net effect is e − (b + d).
The size of each effect depends on elasticities: the more elastic is supply, the larger the protective effect and b; the more elastic is demand, the larger the consumption effect and d; with inelastic demand and supply, the revenue effect dominates and the deadweight loss is small. Imports also fall (the trade effect), and if imports fall to zero the tariff becomes prohibitive and no revenue is earned.
Q6(b) · Trade Policy, Protection and the WTO · 15 marks≈ 11 min
Trade Blocs, Customs Unions and Monetary Unions
Define the concepts of trade creation and trade diversion. Explain their role in the context of gains from trade bloc.
हिंदी में प्रश्न
व्यापार सृजन और व्यापार विचलन की अवधारणाओं को परिभाषित कीजिए। व्यापार समूह (ट्रेड ब्लॉक) से व्युत्पन्न लाभ के संदर्भ में उनकी भूमिका की व्याख्या कीजिए।
Practise this question Trade Policy, Protection and the WTO notes
Model answer
Paper and question: Paper I, Q6(b)
Approach: Define trade creation and trade diversion (Viner, 1950) with a numerical or diagrammatic illustration, then explain how their balance determines the gains from a bloc and the conditions favouring trade creation.
Jacob Viner (The Customs Union Issue, 1950) showed that a customs union, which removes tariffs among members but keeps a common external tariff, is not necessarily a move towards free trade.
Trade creation occurs when high-cost domestic production is replaced by cheaper imports from a partner after internal tariffs are removed. Trade diversion occurs when imports from a low-cost outside country are replaced by imports from a higher-cost partner, because the partner no longer pays the tariff.
Illustration: suppose India produces a good at ₹100, country A (a partner) at ₹90 and country B (outside) at ₹80, and India's tariff is 50%. Before the union India imports from B at ₹120. After forming a union with A, A's good costs ₹90 while B's still costs ₹120, so India switches to A: consumers gain, but the country now pays ₹90 instead of ₹80 for each unit, and loses revenue of ₹40 per unit, a diversion loss.
Gains from a bloc depend on whether trade creation outweighs trade diversion. Creation is more likely when members' economies are competitive (similar products) but with different costs, when pre-union tariffs were high and the common external tariff is low. Dynamic gains (scale, competition, investment) add to the static ones.
Thus a bloc raises welfare only if trade creation dominates.
Q6(c) · Balance of Payments and Exchange Rates · 15 marks≈ 11 min
Policy Mix: Swan Diagram, Mundell's Assignment and Mundell-Fleming
Do you think that perfect capital mobility under fixed exchange rate improves the effectiveness of fiscal and monetary policies? Explain.
हिंदी में प्रश्न
क्या आपको लगता है कि स्थिर विनिमय दर के अन्तर्गत पूर्ण पूँजी गतिशीलता, राजकोषीय और मौद्रिक नीतियों की प्रभावशीलता में सुधार करती है? समझाइए।
Practise this question Balance of Payments and Exchange Rates notes
Model answer
Paper and question: Paper I, Q6(c)
Approach: Use the Mundell-Fleming model with a horizontal BP curve under a fixed rate: show that fiscal policy becomes fully effective and monetary policy ineffective, with the diagram, so the answer is 'yes for fiscal, no for monetary'.
In the Mundell-Fleming model with perfect capital mobility, the domestic interest rate cannot differ from the world rate r*, so the BP curve is horizontal at r*. Under a fixed exchange rate the central bank must buy or sell foreign exchange to hold the peg, so the money supply becomes endogenous.
Fiscal policy is more effective: a rise in G shifts IS right, pushing r above r*. Capital flows in, creating pressure for appreciation; to defend the peg the central bank buys foreign currency, expanding the money supply, so LM shifts right until r returns to r*. Income rises by the full closed-economy multiplier with no crowding out.
Monetary policy is ineffective: an expansion shifts LM right and lowers r below r*; capital flows out and the currency tends to depreciate; the central bank sells reserves, the money supply contracts and LM shifts back. Output is unchanged; only reserves fall (sterilisation cannot work for long).
Diagram: IS, LM and a horizontal BP at r*; fiscal case: IS1 to IS2, then LM1 to LM2, income rises from Y1 to Y2 at r*; monetary case: LM shifts right and returns to LM1.
Hence perfect capital mobility under a fixed rate improves the effectiveness of fiscal policy but makes monetary policy powerless, the basis of the 'impossible trinity'.

Question 7 (50 marks)

Q7(a) · Theories of Growth · 20 marks≈ 14 min
Neo-classical (Solow) and Endogenous Growth: Human Capital and R&D
Analyse critically the role of human capital and Research and Development (R&D) expenditure on economic growth in the framework of endogenous growth model.
हिंदी में प्रश्न
अन्तर्जात संवृद्धि मॉडल के ढाँचे में आर्थिक विकास पर मानव पूँजी और अनुसंधान एवं विकास (R&D) व्यय की भूमिका का आलोचनात्मक विश्लेषण कीजिए।
Practise this question Theories of Growth notes
Model answer
Paper and question: Paper I, Q7(a)
Approach: Set out why endogenous growth theory was needed, then the human-capital channel (Lucas) and the R&D channel (Romer) with their equations, and critically assess (scale effects, Jones's critique, evidence, policy).
In the Solow model long-run growth of income per head equals the exogenous rate of technical progress, and diminishing returns to capital stop growth from saving. Endogenous growth theory explains growth from within the model by finding inputs that do not suffer diminishing returns.
Human capital (Lucas, 1988): output is Y = K^β(u·h·L)^(1−β)·hₐ^γ, where u is the share of time spent working and hₐ the average skill level (an externality). Human capital accumulates as ḣ = δ(1 − u)h, linear in h, so it grows at a constant rate δ(1 − u) without diminishing returns. Long-run growth therefore depends on the time devoted to learning, and the externality means the market under-invests in education.
R&D (Romer, 1990): new designs are produced by researchers using the existing stock of knowledge, Ȧ = δ·H_A·A, so g_A = δH_A. Because ideas are non-rival, output has increasing returns overall; firms do research to earn monopoly rents from patents. The growth rate rises with the human capital allocated to research and its productivity.
Critical assessment: (i) Charles Jones (1995) noted the scale effect: in Romer's model growth should rise with the number of researchers, yet the US research workforce rose several-fold since 1950 without faster growth; his semi-endogenous model (Ȧ = δL_A^λA^φ, φ less than 1) makes long-run growth depend on population growth. (ii) Linear accumulation (the knife-edge assumption of exactly constant returns) is arbitrary. (iii) Empirically, education's effect on growth is weaker than micro returns suggest when quality is poor (Pritchett, 2001, 'Where Has All the Education Gone?'). (iv) R&D's benefits depend on institutions, patents and absorptive capacity; developing countries gain more from imitation than frontier research.
Still, the models justify public support for education and research, since spillovers make private investment too low.
Q7(b) · Economic Development · 15 marks≈ 11 min
Trade, Foreign Investment and Multinationals in Development
"Increasing role of multinationals has reduced the significance of foreign aid during post-World Trade Organization (WTO) regime." Do you agree with this statement? Explain.
हिंदी में प्रश्न
"बहुराष्ट्रीय कंपनियों की बढ़ती भूमिका ने विश्व व्यापार संगठन (WTO) के बाद की व्यवस्था में, विदेशी सहायता के महत्त्व को कम कर दिया है।" क्या आप इस कथन से सहमत हैं? स्पष्ट कीजिए।
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q7(b)
Approach: Take a qualified position: show with data how FDI and MNC flows have overtaken aid, explain why, then argue that aid retains a distinct role (LDCs, social sectors, global public goods, crises) and conclude.
I agree only partly. Since the WTO came into being in 1995, private capital flows led by multinationals have far exceeded official aid. Global FDI flows were about 1.5 trillion US dollars in 2024 (UNCTAD, World Investment Report 2025), while official development assistance from OECD donors was about 212 billion dollars (OECD preliminary data for 2024).
Why MNCs have gained importance: liberalisation of trade and investment under the WTO (TRIMs, GATS) and unilateral reforms; the rise of global value chains; and the advantages of FDI over aid: it brings technology, management and market access, is non-debt-creating, carries no political conditionality and is tied to performance.
Why aid remains significant: (i) FDI is concentrated in a few large emerging economies and in profitable sectors, while least developed countries, especially in sub-Saharan Africa, receive little and still depend on aid; (ii) aid finances public goods MNCs will not provide: primary health, education, sanitation and humanitarian relief; (iii) global public goods such as climate finance and pandemic response rely on official flows; (iv) concessional lending by the World Bank's IDA and multilateral banks supports countries in crisis when private capital flees; (v) aid can build the institutions and infrastructure that attract FDI.
Hence multinationals have reduced aid's relative importance as a source of capital, but not its significance for the poorest countries and for public goods; the two are complements.
Q7(c) · Theories of Growth · 15 marks≈ 11 min
Harrod-Domar Model
Define the concept of natural growth in Harrod's model. What are the implications of deviation of actual growth from natural growth?
हिंदी में प्रश्न
हैरोड के मॉडल में प्राकृतिक वृद्धि की अवधारणा को परिभाषित कीजिए। प्राकृतिक वृद्धि से वास्तविक वृद्धि के विचलन के क्या निहितार्थ हैं?
Practise this question Theories of Growth notes
Model answer
Paper and question: Paper I, Q7(c)
Approach: Define Gn with its determinants, then explain the two cases of deviation (actual or warranted growth above and below Gn) and their consequences, with the policy implication.
In Harrod's model the natural rate of growth Gn is the maximum long-run rate permitted by the growth of the labour force and labour-augmenting technical progress: Gn = n + λ, where n is population (labour force) growth and λ the rate of technical progress. It is the rate that maintains full employment.
Gn is a ceiling: actual growth can exceed Gn only temporarily, by absorbing unemployed labour, after which it is pulled back to Gn.
Case 1, G (and Gw) above Gn: output cannot grow faster than labour and technology allow for long. When G is pulled down to Gn it falls below Gw, firms find excess capacity, cut investment, and the economy tends to secular stagnation. This fits mature high-saving economies; the remedy is to lower s or raise public investment.
Case 2, G (and Gw) below Gn: capital grows too slowly to employ the growing labour force, so there is chronic structural unemployment of labour together with a tendency for G to exceed Gw, i.e. inflationary pressure and booms. This fits developing countries with high population growth and low saving; the remedy is to raise s through saving mobilisation.
Thus full-employment steady growth requires G = Gw = Gn, which Joan Robinson called a 'golden age', a mythical state, since s, Cr and n are determined independently. Solow and Kaldor later showed how Gw could adjust towards Gn.

Question 8 (50 marks)

Q8(a) · Trade Policy, Protection and the WTO · 20 marks≈ 14 min
GATT and WTO: Rounds, TRIMs, TRIPS and Domestic Measures
Explain the role of World Trade Organization (WTO) in the present context. Discuss the merits and demerits of TRIMs and TRIPs.
हिंदी में प्रश्न
वर्तमान परिप्रेक्ष्य में विश्व व्यापार संगठन (WTO) की भूमिका की व्याख्या कीजिए। ट्रिम्स (TRIMs) और ट्रिप्स (TRIPs) के गुण और दोषों की विवेचना कीजिए।
Practise this question Trade Policy, Protection and the WTO notes
Model answer
Paper and question: Paper I, Q8(a)
Approach: Explain the WTO's functions and its present-day role and challenges (dispute settlement crisis, stalled negotiations, rising protectionism, new issues), then the merits and demerits of TRIMs and TRIPS, with India's experience.
The World Trade Organization, set up on 1 January 1995 after the Uruguay Round, administers trade agreements, provides a forum for negotiations, settles disputes, monitors trade policies and helps developing countries. It rests on non-discrimination (most-favoured-nation and national treatment), binding tariffs, transparency and special and differential treatment.
Present role and challenges: it still provides the rules for most world trade and a stable baseline of bound tariffs, but (i) its Appellate Body has been unable to function since December 2019, when the US blocked appointments, weakening enforcement; (ii) the Doha Round has stalled, with only partial outcomes such as the Trade Facilitation Agreement (2013, in force 2017) and the fisheries subsidies agreement (2022); (iii) unilateral tariffs, US-China trade conflict and industrial subsidies test its rules. Its role today is to preserve a rules-based system and reform itself.
TRIMs, merits: by banning investment measures inconsistent with national treatment and the prohibition of quantitative restrictions (local content, trade-balancing and foreign-exchange balancing requirements), it reduces distortions and makes FDI regimes more predictable. Demerits: it removes tools developing countries used to build linkages and domestic industry; India had to drop such conditions in its automobile policy after a WTO ruling in 2001.
TRIPS, merits: minimum standards for patents (20 years), copyrights and trademarks encourage innovation and technology transfer through FDI. Demerits: stronger patents raise prices of medicines and seeds in poor countries, favour rich-country right-holders and may slow imitation-based learning; flexibilities such as compulsory licensing (India's Natco case, 2012), the Doha Declaration (2001) and section 3(d) of India's Patents Act limit these costs.
Hence the WTO remains essential, but needs dispute-settlement reform and a fairer balance between innovation and development in TRIMs and TRIPS.
Q8(b) · Economic Development · 15 marks≈ 11 min
Development and Environmental Sustainability
Do you think that economic growth and sustainable development are contrary to each other? Justify your answer.
हिंदी में प्रश्न
क्या आप मानते हैं कि आर्थिक संवृद्धि एवं संपोषित विकास एक-दूसरे के विपरीत हैं? अपने उत्तर को न्यायसंगत ठहराइए।
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q8(b)
Approach: Argue that they are not inherently contrary: present the conflict view (limits to growth, rebound), then the complementarity view (EKC, decoupling, green growth, growth financing sustainability), and conclude with conditions.
Sustainable development (Brundtland, 1987) is development that meets present needs without compromising future generations. Whether it conflicts with economic growth depends on the kind of growth.
The conflict view: the Club of Rome's The Limits to Growth (Meadows et al., 1972) and Herman Daly's steady-state economics argue that on a finite planet continuous growth in output must exhaust resources and sinks; global emissions and material use have risen with world GDP, and efficiency gains are partly offset by higher consumption (the Jevons or rebound effect).
The complementarity view: (i) growth that changes composition and technique can reduce pollution per unit of output: the environmental Kuznets curve; (ii) several advanced economies, such as the UK, have cut territorial carbon emissions while growing, showing decoupling; (iii) growth provides resources for clean technology, and poverty itself degrades the environment through fuelwood use and soil mining; (iv) clean energy, efficiency and the circular economy create new industries, the idea of green growth.
In India, rising GDP has gone with a fall in emissions intensity of GDP and non-fossil sources reaching about half of installed power capacity in 2025, though absolute emissions still rise.
Hence growth and sustainable development are not inherently contrary; they conflict only when growth is resource-intensive and externalities are unpriced. Pricing carbon, investing in renewables and protecting natural capital make them compatible.
Q8(c) · Economic Development · 15 marks≈ 11 min
Planning, Tinbergen, Market versus Planning and Public-Private Partnership
Explain the role of planning in the development process in the context of increasing significance of market economy.
हिंदी में प्रश्न
बाज़ार अर्थव्यवस्था के बढ़ते महत्त्व के संदर्भ में विकास प्रक्रिया में नियोजन की भूमिका की व्याख्या कीजिए।
Practise this question Economic Development notes
Model answer
Paper and question: Paper I, Q8(c)
Approach: Show why planning still matters in a market economy (market failures, coordination, long-term investment, equity, sustainability), how its form has changed (indicative, Tinbergen's targets and instruments, PPP), with India's experience.
Even as markets have become the main allocators of resources, planning, meaning the conscious coordination of economic decisions towards chosen goals, remains important in development; what has changed is its form.
Why planning remains relevant: (i) market failures: public goods, externalities, information gaps and missing markets for long-term finance; (ii) coordination failures: Rosenstein-Rodan's big push shows that complementary investments may not happen without coordination, especially in infrastructure; (iii) long horizons: markets under-invest in projects with long gestation, such as power, railways, research and human capital; (iv) equity and regional balance, which markets do not ensure; (v) sustainability, such as energy transition, which requires long-term targets.
Changed role: planning is now indicative and strategic. Following Tinbergen, the planner fixes targets (growth, employment, emissions) and assigns instruments (public investment, taxes, regulation), and coordinates with the private sector through incentives, PPP and stable policy rather than licences and quantitative controls. East Asian states combined markets with strategic planning, the 'developmental state'.
In India the Planning Commission's Five Year Plans ended with the Twelfth Plan (2012–17); NITI Aayog (2015) prepares strategies and visions, monitors outcomes (SDG India Index, Aspirational Districts Programme from 2018) and promotes cooperative federalism, while the National Infrastructure Pipeline (2019) and PM Gati Shakti (2021) coordinate infrastructure.
Hence, in a market economy, planning complements markets by setting direction, coordinating investment and correcting failures.

UPSC Mains 2025 Economics Paper II