MEC 106 Solved Guess Paper 2026 for Public Economics IGNOU MA Economics Second Year

Sample 1 of 5 · Q1 · Externalities and Their Solutions · 20 Marks · Block 2 Unit 5

Last appeared: June 2025, Dec 2024, June 2024, June 2023 · Priority: High

Question: Explain the meaning and types of externalities. What are the consequences of negative externalities? Describe the major policy instruments available as "solutions" to the issue of externalities.

"Externalities are the costs borne by (or benefits accrued to) third parties who are neither producers nor consumers."

Most economic activities also touch people who are not part of the deal. A paper mill sells paper and earns money. Buyers use the paper. But the smoke and dirty water hurt other people nearby. These other people are the third party. So the social cost of making a good is often higher than the private cost. Firms ignore this extra cost while fixing output. This gap is the externality. In marginal terms the book writes it as MSC = MPC + MEC and MSB = MPB + MEB.

Types of Externalities

The book divides externalities in a four fold way. The first cut is by effect, good or bad. The second cut is by the activity, production or consumption.

1. Negative Production Externality. The harm comes from making a good. Pollution and soil degradation are the examples. The book calls this the most common type.
2. Positive Production Externality. The gain comes from making a good. Bee keeping is the example.
3. Negative Consumption Externality. The harm comes from using a good. Passive smoking is the example.
4. Positive Consumption Externality. The gain comes from using a good. Vaccination is the example.

Consequences of Negative Externalities

1. Over production. The market settles at output QM, but the socially right output is only QS.
2. Price is too low. Buyers pay PM, which sits below the correct price PS. The full cost is not in the price.
3. Deadweight loss. Welfare equal to the area of triangle ABC is lost. Resources go to the wrong place.
4. Cost falls on innocent people. People who neither made nor bought the good pay through bad health, lost fishing and boating and swimming, or spending on repellents and treatment.
5. Market fails on its own. Even a perfectly competitive market cannot fix this, so the government must step in.

Internalisation of Externalities

1. Corrective tax, the Pigovian tax. Arthur Pigou suggested a tax T exactly equal to MEC. Then MPB = MSB = MSC = MPC + T. Output falls to the right level and the government earns revenue. This is the polluter pays principle. When the good is an intoxicant the same tax is called a sin tax.
2. Property rights, the Coase Theorem. Ronald Coase said the government should clearly assign property rights and cut transaction costs. The two sides then bargain and reach an efficient answer. It does not matter who gets the right, which is called the invariance principle. It works only if transaction cost is zero.
3. Corrective subsidy. For a good with positive externality a subsidy equal to MEB is paid. Then MPB + S = MSB = MSC and output rises from QM to QS. Governments use this for primary education and similar services.

Policy Instruments

1. Command and control. The government simply fixes standards. India imposed Bharat IV standards on all engines in 2010. Such standards may still be inefficient, because plants differ in technology and size.
2. Capping and trading of pollution rights. A fixed number of permits is issued, which is capping. Firms that pollute less may sell spare permits to firms that need more, which is trading. The EPA in the United States used this in 1995 to cut sulphur dioxide from power plants and halve acid rain from its 1980 level.

Conclusion. Externalities make even a perfectly competitive market inefficient. Taxes, subsidies and clear property rights bring the external cost or benefit inside the private calculation. Newer policy now prefers cap and trade permits.

Sample 2 of 5 · Q3 · Market Failure and Government Failure · 20 Marks · Block 1 Unit 2

Last appeared: Dec 2025, Dec 2024, June 2024 · Priority: High

Question: What are the symptoms of market failure? Discuss how such failure can be overcome. Also explain why government intervention itself may end in government failure.

"Market Failure: A situation where optimal level of production is not produced due to violation of one or the other factors of perfect competitive market."

Efficiency is judged by welfare. Welfare is the difference between what members of a society are willing to pay for a given quantity and what it costs society to produce that quantity. It is also the sum of consumers surplus and producers surplus. A perfectly competitive market is assumed to maximise welfare. When its strict assumptions break, the market fails.

Symptoms of Market Failure

1. Externality. Under a negative production externality the social marginal cost lies above the private marginal cost, so too much is produced and welfare falls by the area RST.
2. Imperfect competition. Monopoly is the limiting case. The monopolist produces where MC = MR at Q*, not at the welfare maximising Qe where MC = WTP. Welfare equal to area TSR is lost.
3. Public goods. Pure public goods are non rival and non excludable. Because people under report willingness to pay, the market may not produce anything at all.
4. Asymmetric information. One side knows more than the other. The two main types are moral hazard, also called hidden action or the principal agent problem, and adverse selection.

Measures to Overcome Market Failure

A Pigouvian tax equal to marginal damage shifts the producer's MC curve up to the SMC curve, so the market produces Qe. Regulation may cap the price at Pe or cap the quantity. A subsidy equal to marginal benefit pushes demand up to the MBS curve, which is why governments subsidise primary education, primary health, immunisation, renewable energy, sanitation and rainwater harvesting.

Beyond these, the book lists anti monopoly laws to promote competition, price controls on monopolies, State owned enterprises for natural monopolies, public funding of defence and law and order and fire services out of the exchequer, and government appointed regulators to close information gaps.

Government Failure

"Government Failure: A situation where intervention of government is inefficient owing to factors like corruption and bureaucratic inefficiency."

Earlier economists treated the State as a black box: put in market failure, get out efficiency. Later study asked how government actually works. Politicians and bureaucrats are no different from other economic agents, because they too follow self interest.

1. Direct democracy fails. With more than two projects, majority voting can give no rational decision. Arrow (1951) proved that a reasonable result under any voting system may not be possible. Black (1948) showed a consistent outcome is possible if preferences are all single peaked, but even then the decision need not be welfare maximising.
2. Representative democracy fails. As Downs (1957) pointed out, parties formulate policies in order to win elections rather than win elections to formulate policies. Election money gives rich business houses leverage, which can degenerate into crony capitalism.
3. Bureaucracy is inefficient. Niskanen's Economic Theory of Bureaucracy shows the bureaucrat is a budget maximising agent. The bureau pushes output to where MSB equals average cost, producing QB instead of Qe and losing welfare equal to TSR.
4. Regulatory capture and rent seeking. A regulator facing a strong case from operators and a weak case from scattered consumers is likely to rule for the firms. Restrictive laws create rents, and firms spend on lobbying to capture them.

Conclusion. Markets fail because of externality, imperfect competition, public goods and asymmetric information. Government should correct these, but government is itself made of self seeking agents, so it too fails. India therefore enacted the Fiscal Reforms and Budget Management Act mainly to put speed breakers on the expansion of government.

Sample 3 of 5 · Q6 · Arrow's Impossibility Theorem · 12 Marks · Block 3 Unit 7

Last appeared: June 2025, June 2024, June 2023 · Priority: High

Question: State Arrow's Impossibility Theorem along with its conditions. Write an analytical note on it.

"While adhering to mandatory principles of fair voting procedures (where a society has at least two individuals and at least three options), it is impossible to have a clear social order of preferences from the individual orders of preferences of social states."

Arrow calls it the general possibility theorem. Like Hicks he accepts ordinal utility, and like Pareto he rejects inter personal comparison. He sought a democratic rule building a social order from individual orders while obeying plausible conditions, called axioms, stated in Social Choice and Individual Values (1951). The axioms, numbered five, are clubbed into three conditions.

The Three Conditions

1. Unanimity or weak Pareto efficiency. If x is strictly preferred over y by every individual, then x must be preferred over y in the social ordering. So unanimity implies non imposition.
2. Non dictatorship. There is no individual whose strict preference always prevails.
3. Independence of irrelevant alternatives. The social ranking of x and y must depend only on how people rank x and y. Bringing in or dropping a third option must not change it.

The Element of Impossibility

Take individuals A, B, C and states x, y, z. A prefers x to y and y to z. B prefers y to z and z to x. C prefers z to x and x to y. Majority counting gives x over y, y over z, and z over x. Transitivity on the first two gives x over z, contradicting z over x. So for some profiles, majority rule may not yield a consistent social choice. This is the voting paradox.

An option that beats every other in pair wise voting is the Condorcet winner. Arrow showed that with two or more voters and three or more alternatives, a Condorcet winner is obtained only if restrictions are placed on individual preferences.

Way Out and Meaning

Black (1948) showed that if preferences are all single peaked, a consistent outcome is possible, and this leads to the Median Voter Theorem. But multi peaked preferences cannot be ruled out. Arrow does not say rules always fail, only that they can fail. No rule is foolproof if the axioms must be adhered to.

Conclusion. Arrow's theorem is the central negative result of social choice theory. It warns that no voting rule can always turn honest individual rankings into a fair and consistent social ranking, unless we accept restrictions such as single peaked preferences.

Sample 4 of 5 · Q10 · Marginal Cost Pricing and Peak Load Pricing · 12 Marks · Block 6 Unit 16

Last appeared: Dec 2025, June 2025, Dec 2024, Dec 2023 · Priority: High

Question: Discuss how "marginal cost pricing" results in an economic loss to a private producer. Explain the concepts of multi part tariff and peak load pricing.

"The optimum of the general welfare corresponds to the sale of everything at marginal cost." — Harold Hotelling (1938)

Public utilities such as electricity, natural gas, water supply, sewerage, telephone and transportation are run or closely regulated by government. Many are natural monopolies with large fixed cost and low variable cost, so they operate along a long stretch of decreasing marginal and average cost.

Why It Causes a Loss

A profit maximising monopoly produces where MR = MC and sells OQM at the high price PM. Government does not permit this. Under the P = MC rule output is largest and price smallest. But average cost still lies above marginal cost in this falling cost range, so price falls below average cost and the monopoly incurs a loss on every unit sold.

Methods to Off Set the Loss

1. Subsidy from general revenues. Hotelling argued the loss should be covered by general government revenues providing for the fixed costs of power plants, waterworks and railroads. The firm earns normal, not super normal, profit.
2. Discrimination by elasticity. Consumers are separated by elasticity, as railways and aviation do through class division.
3. Other rules. Multi part pricing by slabs, full cost pricing, a fixed rate of return, or a mark up over cost.

Multi Part Tariff

Coase suggested the two part tariff: an access charge for the right to use the service plus a usage charge per unit. The access charge behaves like a fixed cost, borne whatever the quantity. Since consumer surplus exists and the producer has none, the regulator lets him extract part of it. Usage rates may be progressive or regressive, the latter as in telephony and internet usage.

Peak Load Pricing

"Peak-Load Pricing: Is a pricing strategy that adopts two (or more) rates for two different periods viz. peak demand period and off-peak demand period."

Demand for utilities is not constant across the day, week or season, and the marginal cost of serving a few more consumers is almost nil in non peak hours. Two prices even out the load: a work traveller will not shift, but a social caller will. Proposed by Peter Steiner in 1956-57, it was adopted from the 1970s for car parking, public transport, water supply and telephony.

Conclusion. Marginal cost pricing gives the most output at the lowest price but leaves a private producer in loss. Two part tariffs recover it through an access charge, while peak load pricing cuts congestion and uses spare capacity.

Sample 5 of 5 · Q13 · Median Voter Theorem and Rent Seeking · 12 Marks · Block 3 Unit 8

Last appeared: June 2025, Dec 2024, Dec 2023 · Priority: High

Question: What is the median voter problem? How does the opinion of the median voter prevail? Distinguish between the concepts of profit seeking and rent seeking.

Public choice theory emerged from the study of taxation and public spending. It developed in the fifties and drew wide attention in 1986 when James Buchanan won the Nobel Prize in economics. Gordon Tullock was another leading architect. Voters, politicians, lobbyists and bureaucrats all put self interest first.

"A 'majority rule voting' system will select the outcome most preferred by the median voter under two assumptions."

1. One dimensional spectrum. All alternatives can be placed along a single line.
2. Single peaked preferences. Voters favour one alternative more than any other.

In the bus stop example, consumers live at equally spaced points along a road and each wants the stop as close as possible. With an odd number of voters, voting over every pair ends at the middle location, which at least half the population also supports. The median voter's choice is the Condorcet winner. Another version uses the single crossing assumption: half the voters lie left of the median voter and half right.

Drawbacks

The theorem needs an odd number of voters, else the two central voters tie and it is silent. Its most significant drawback is that it applies only to a single dimensional decision. In practice the political spectrum has many dimensions with multiple peaks, so results rest on a few voters in the middle who hold the decisive balance.

Conclusion. Under single peaked preferences the median voter decides, which is why parties gravitate to the middle. Self interest also breeds rent seeking, where effort goes into capturing income rather than creating it, a central cause of government failure.