ECON4045 Public Economics Degree Exam 2021
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Degree Exam
Public Economics, ECON4045
2021
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For both Section A and Section B:
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Section A
You must answer ONE question, using a separate document for each sub question (the weighting per sub question is noted against the sub question).
Question 1
Consider an economy populated with individuals who derive utility from consumption and leisure.
1.1 Assume that an individual chooses labour supply to maximise their utility, subject to a constant income tax rate. Using diagrams, analyse how the constant income tax rate affects labour supply and welfare of an individual in this economy. Explain the importance of the participation decision in determining effects on labour supply.
[25%]
1.2 Explain how and why you need to modify the assumptions of the model economy in 1.1, and which additional assumptions you need to add, to examine optimal income taxes in the Mirrleesian framework.
[25%] [Maximum word limit: 1500]
Question 2
Consider the properties of optimal income taxes as derived from the numerical application of the Mirrleesian framework in Hindriks and Myles (2013) (the relevant tables, Tables 16.2 and 16.3, are also attached with the exam).
2.1 Explain whether these properties, obtained numerically, are consistent with the properties of optimal income taxes in the Mirrleesian framework that are derived theoretically (i.e. using diagrams) in Hindriks and Myles (2013).
[15%]
2.2 Describe and explain the properties of optimal income taxes seen in the tables associated with the numerical application that are in addition to those derived from the theoretical analysis.
[15%]
2.3 Explain why increased equity may increase social welfare under a utilitarian social welfare function. Explain how this is manifested in the numerical results in Hindriks and Myles (2013) associated with the numerical application. Discuss how the results in these tables in Hindriks and Myles (2013) demonstrate the importance that social preferences for equity have for optimal income taxation.
[20%] [Maximum word limit: 1500]
Section B
You must answer 1 question, using a separate document for each sub question (the weighting per sub question is noted against the sub question).
Question 3
Consider a model economy with a public good.
3.1 Assume that the economy consists of two individuals who choose their contribution to the public good. Explain, using diagrams, how to obtain the equilibrium quantity of the public good in the market economy.
[20%]
3.2 Assume now that the model economy has instead the following characteristics. The economy consists of many individuals, who may differ in their income. The government provides the public good using a constant income tax rate to finance the required expenditure. Assume that the quantity of the public good is decided by majority voting. Show mathematically how income inequality is linked to the quantity of the public good provided by the government. Explain all steps of your analysis, making clear how they use model assumptions, and provide intuition for the result.
[30%] [Maximum word limit: 1500]
Question 4
Consider a model economy with a public good.
4.1 Assume that the economy consists of two individuals who choose their contribution to the public good. Compare the market equilibrium with the socially efficient equilibrium. Explain whether the public good is under-provided or over-provided in the market equilibrium.
[20%]
4.2 Assume now that the model economy has instead the following characteristics. The public good is provided by a bureaucrat who works for the government. The bureaucrat aims to maximise the size of their bureau, which depends on the quantity of the public good they provide. The government cannot observe the cost for providing the public good. Show mathematically the implications of this model regarding the optimal quantity of the public good. Explain all steps of your analysis making clear how they use model assumptions, and provide intuition for the result.
[30%] [Maximum word limit: 1500]
2022-04-18