Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Economics, 2006. / Page 157 blank. / Includes bibliographical references. / Chapter 1 analyzes the theoretical and quantitative implications of optimal fiscal policy in a business cycle model with incomplete markets. I first consider the problem of a government facing expenditure shocks in an economy where the only asset is a real risk-free bond. The model features a representative-agent economy with proportional taxes on labor and capital. Taxes on capital must be set one period in advance, reflecting inertia in tax codes. This rules out replication of the complete markets allocation. In the model, capital taxation and capital ownership provide a state contingent source of revenues - creating a new potential role for capital taxation and ownership as risk sharing instruments between the government and private agents. For a baseline case, I show that the optimal policy features a zero tax on capital. Numerical simulations show that the baseline case provides an excellent benchmark: the average tax on capital, while not theoretically zero, turns out to be small. The volatility of capital taxes decreases sharply as the period length is increased. I then allow the government to hold a non trivial position in capital. Capital ownership allows the government to realize about 90% of the welfare gains from moving to complete markets. / (cont.) Large positions are typically required for optimality. But smaller positions achieve substantial benefits. In a business-cycle simulation, I show that a 15% short equity position achieves over 40% of the welfare gains from completing markets. Chapter 2 is the product of joint work with Ivan Werning and analyzes how estate taxes should optimally be set.For an economy with altruistic parents facing productivity shocks, the optimal estate taxation is progressive: fortunate parents should face lower net returns on their inheritances. This progressivity reflects optimal mean reversion in consumption, which ensures that a long-run steady state exists with bounded inequality-avoiding immiseration. Chapter 3 is the product of joint work with Stavros Panageas. We study optimal consumption and portfolio choice in a framework where investors save for early retirement and assume that agents can adjust their labor supply only through an irreversible choice of their retirement time. We obtain closed form solutions and analyze the joint behavior of retirement time, portfolio choice, and consumption. Investing for early retirement tends to increase savings and stock market exposure, and reduce the marginal propensity to consume out of accumulated personal wealth. / (cont.) Contrary to common intuition, prior to retirement an investor might find it optimal to increase the proportion of financial wealth held in stocks as she ages, even when she receives a constant income stream and the investment opportunity set is also constant. This is particularly true when the wealth of the investor increases rapidly due to strong stock market performance, as was the case in the late 1990's. We also show that the model can potentially provide a rational explanation for the paradoxical fact that some investors saving for retirement chose to increase their allocation to stocks as the market was booming and reduce it thereafter. / by Emmanuel Farhi. / Ph.D.
| Identifer | oai:union.ndltd.org:MIT/oai:dspace.mit.edu:1721.1/37412 |
| Date | January 2006 |
| Creators | Farhi, Emmanuel |
| Contributors | Ricardo Caballero and Iván Werning., Massachusetts Institute of Technology. Dept. of Economics., Massachusetts Institute of Technology. Dept. of Economics. |
| Publisher | Massachusetts Institute of Technology |
| Source Sets | M.I.T. Theses and Dissertation |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | 157 p., application/pdf |
| Rights | M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission., http://dspace.mit.edu/handle/1721.1/7582 |
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