Essays in dynamic contract theory

This thesis contains three essays in dynamic contract theory and dynamic public finance. The first essay introduces history-dependent preferences into the repeated moral hazard framework. The second essay analyzes the first-order approach to moral hazard problems with hidden saving. The third essay studies optimal income taxation with asset accumulation

Optimal capital taxation for time-nonseparable preferences

This paper studies the effect of habit formation on optimal capital taxes in a dynamic Mirrleesian model. We make three distinct contributions. First, we decompose intertemporal wedges (implicit capital taxes) for general time-nonseparable preferences into a wealth effect, a complementarity effect, and a future incentive effect. Second, we provide conditions under which intertemporal wedges are positive. Third, we derive a recursive formulation of constrained efficient allocations and evaluate the quantitative impact of habit formation. In a model parameterized to the U.S. economy, habit formation reduces average intertemporal wedges by about 40 percent compared to the time-separable case. Moreover, intertemporal wedges are close to zero for the largest part of the working life

Optimal capital taxation for time-nonseparable preferences

This paper studies the effect of habit formation on optimal capital taxes in a dynamic Mirrleesian model. We make three distinct contributions. First, we decompose intertemporal wedges (implicit capital taxes) for general time-nonseparable preferences into a wealth effect, a complementarity effect, and a future incentive effect. Second, we provide conditions under which intertemporal wedges are positive. Third, we derive a recursive formulation of constrained efficient allocations and evaluate the quantitative impact of habit formation. In a model parameterized to the U.S. economy, habit formation reduces average intertemporal wedges by about 40 percent compared to the time-separable case. Moreover, intertemporal wedges are close to zero for the largest part of the working life

Should unemployment insurance be asset-tested?

A series of empirical studies has documented that job search behavior depends on the financial situation of the unemployed. Starting from this observation, we ask how unemployment insurance policy should take the individual financial situation into account. We use a quantitative model with a realistically calibrated unemployment insurance system, individual consumption-saving decision and moral hazard during job search to answer this question. We find that the optimal policy provides unemployment benefits that increase with individual assets. By implicitly raising interest rates, asset-increasing benefits encourage self-insurance, which facilitates consumption smoothing during unemployment but does not exacerbate moral hazard for job search. Asset-increasing benefits also have desirable properties from a dynamic perspective, because they emulate key features of the dynamics of constrained efficient allocations. We find welfare gains from introducing asset-increasing benets that are substantial and amount to 1.5% of consumption when comparing steady states and 0.8% of consumption when taking transition costs into account. More generous replacement rates or benefits targeted to asset-poor households, by contrast, have a negative effect on welfare

Should unemployment insurance be asset-tested?

A series of empirical studies has documented that job search behavior depends on the financial situation of the unemployed. Starting from this observation, we ask how unemployment insurance policy should optimally take the individual financial situation into account. Using a quantitative model with a realistically calibrated unemployment insurance system, individual consumption-saving decision and moral hazard during job search, we find that the optimal policy provides unemployment benefits that increase with individual assets. By implicitly raising interest rates, asset-increasing benefits encourage self-insurance, which facilitates consumption smoothing during unemployment, but does not exacerbate moral hazard for job search. Asset-increasing benefits also have desirable properties from a dynamic perspective, because they emulate key features of the dynamics of constrained efficient allocations. We find welfare gains from introducing asset-increasing benefits that are substantial and amount to 1.5% of consumption when comparing steady states and 0.8% of consumption when taking transition costs into account. More generous replacement rates or benefits targeted to asset-poor households, by contrast, have a negative effect on welfare

Should unemployment insurance be asset-tested?

A series of empirical studies has documented that job search behavior depends on the financial situation of the unemployed. Starting from this observation, we ask how unemployment insurance policy should take the individual financial situation into account. We use a quantitative model with a realistically calibrated unemployment insurance system, individual consumption-saving decision and moral hazard during job search to answer this question. We find that the optimal policy provides unemployment benefits that increase with individual assets. By implicitly raising interest rates, asset-increasing benefits encourage self-insurance, which facilitates consumption smoothing during unemployment but does not exacerbate moral hazard for job search. Asset-increasing benefits also have desirable properties from a dynamic perspective, because they emulate key features of the dynamics of constrained efficient allocations. We find welfare gains from introducing asset-increasing benets that are substantial and amount to 1.5% of consumption when comparing steady states and 0.8% of consumption when taking transition costs into account. More generous replacement rates or benefits targeted to asset-poor households, by contrast, have a negative effect on welfare

Should unemployment insurance be asset-tested?

A series of empirical studies has documented that job search behavior depends on the financial situation of the unemployed. Starting from this observation, we ask how unemployment insurance policy should take the individual financial situation into account. We use a quantitative model with a realistically calibrated unemployment insurance system, individual consumption-saving decision and moral hazard during job search to answer this question. We find that the optimal policy provides unemployment benefits that increase with individual assets. By implicitly raising interest rates, asset-increasing benefits encourage self-insurance, which facilitates consumption smoothing during unemployment but does not exacerbate moral hazard for job search. Asset-increasing benefits also have desirable properties from a dynamic perspective, because they emulate key features of the dynamics of constrained efficient allocations. We find welfare gains from introducing asset-increasing benets that are substantial and amount to 1.5% of consumption when comparing steady states and 0.8% of consumption when taking transition costs into account. More generous replacement rates or benefits targeted to asset-poor households, by contrast, have a negative effect on welfare

Optimal income taxation with asset accumulation

Several frictions restrict the government's ability to tax assets. First of all, it is very costly to monitor trades on international asset markets. Moreover, agents can resort to non-observable low-return assets such as cash, gold or foreign currencies if taxes on observable assets become too high. This paper shows that limitations in asset observability have important consequences for the taxation of labor income. Using a dynamic moral hazard model of social insurance, we �find that optimal labor income taxes typically become less progressive when assets are imperfectly observed. We evaluate the effect quantitatively in a model calibrated to U.S. data

Optimal income taxation with asset accumulation

Several frictions restrict the government's ability to tax assets. First of all, it is very costly to monitor trades on international asset markets. Moreover, agents can resort to non-observable low-return assets such as cash, gold or foreign currencies if taxes on observable assets become too high. This paper shows that limitations in asset observability have important consequences for the taxation of labor income. Using a dynamic moral hazard model of social insurance, we �find that optimal labor income taxes typically become less progressive when assets are imperfectly observed. We evaluate the effect quantitatively in a model calibrated to U.S. data