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Working Paper
Bank Liquidity and Capital Regulation in General Equilibrium
We develop a nonlinear dynamic general equilibrium model with a banking sector and use it to study the macroeconomic impact of introducing a minimum liquidity standard for banks on top of existing capital adequacy requirements. The model generates a distribution of bank sizes arising from differences in banks' ability to generate revenue from loans and from occasionally binding capital and liquidity constraints. Under our baseline calibration, imposing a liquidity requirement would lead to a steady-state decrease of about 3 percent in the amount of loans made, an increase in banks' holdings ...
Working Paper
Human Capital Risk, Contract Enforcement, and the Macroeconomy
We use data from the Survey of Consumer Finance and Survey of Income Program Participation to show that young households with children are under-insured against the risk that an adult member of the household dies. We develop a tractable macroeconomic model with human capital risk, age-dependent returns to human capital investment, and endogenous borrowing constraints due to the limited pledgeability of human capital (limited contract enforcement). We show analytically that, consistent with the life insurance data, in equilibrium young households are borrowing constrained and under-insured ...
Working Paper
Mobility
This paper studies short-run wealth mobility in a heterogeneous agents, incomplete-markets model. Wealth mobility has a ?hump-shaped? relationship with the persistence of the stochastic process governing labor income: low when shocks are close to i.i.d. or close to a random walk, and higher in between. The standard incomplete markets framework features less wealth mobility than found in the PSID wealth supplements. We include features commonly used in the literature to capture wealth inequality and find that they do little to improve the model?s performance for wealth mobility. Finally, we ...
Working Paper
A Comment on 'Wealth Inequality and Endogenous Growth' by Byoungchan Lee
How does wealth inequality affect economic growth? Byoungchan Lee answers this question by developing a heterogeneous-agent model and augmenting it with endogenous firm innovation. The novel channel is that rising wealth concentration reduces aggregate demand, which gives firms a disincentive to spend on R&D and therefore leads to slower productivity growth. In this discussion, we first explain the difference in calibration strategy between Lee’s approach and the common approach in the literature, and then discuss its quantitative implications for the effect of rising inequality on ...
Working Paper
Enduring Relationships in an Economy with Capital and Private Information
We study efficient risk sharing in a model where agents operate linear production technologies with private information about idiosyncratic productivity. Capital is the sole factor of production, and accumulable. We establish a time-invariant, one-to-one mapping between the capital allocated to an agent and his lifetime utility entitlement. The mapping implies properties that are distinct from those in models with private information about endowments. In contrast to the latter, the value of the risk-sharing arrangement in our model always remains above the autarky value. There is no need for ...
Working Paper
Optimal Time-Consistent Taxation with Default
We study optimal time-consistent distortionary taxation when the repayment of government debt is not enforceable. The government taxes labor income or issues noncontingent debt in order to finance an exogenous stream of stochastic government expenditures. The government can repudiate its debt subject to some default costs, thereby introducing some state-contingency to debt. We are motivated by the fact that domestic sovereign default is an empirically relevant phenomenon, as Reinhart and Rogoff (2011) demonstrated. Optimal policy is characterized by two opposing incentives: an incentive to ...
Working Paper
Credit Default Swaps in General Equilibrium: Spillovers, Credit Spreads, and Endogenous Default
This paper highlights two new effects of credit default swap markets (CDS) in a general equilibrium setting. First, when firms' cash flows are correlated, CDSs impact the cost of capital{credit spreads{and investment for all firms, even those that are not CDS reference entities. Second, when firms internalize the credit spread changes, the incentive to issue safe rather than risky bonds is fundamentally altered. Issuing safe debt requires a transfer of profits from good states to bad states to ensure full repayment. Alternatively, issuing risky bonds maximizes profits in good states at the ...
Working Paper
Income Differences and Health Disparities: Roles of Preventive vs. Curative Medicine
Using data from the Medical Expenditure Panel Survey (MEPS) I find that early in life the rich spend significantly more on health care, whereas from middle to very old age the poor outspend the rich by 25% in the US. Furthermore, while low-income individuals are less likely to incur medical expenses, they are more prone to experiencing extreme expenses when they do seek care. To account for these facts, I develop and estimate a life-cycle model of two types of health capital: physical and preventive. Physical health capital determines survival probabilities, whereas preventive health capital ...
Working Paper
Constrained inefficiency and optimal taxation with uninsurable risks
When individuals' labor and capital income are subject to uninsurable idiosyncratic risks, should capital and labor be taxed, and if so, how? In a two-period general equilibrium model with production, we derive a decomposition formula of the welfare effects of these taxes into insurance and distribution effects. This method allows us to determine how the sign of the optimal taxes on capital and labor depends on the nature of the shocks, the degree of heterogeneity among consumers' income, and the way in which the tax revenue is used to provide lump sum transfers to consumers. When shocks ...
Working Paper
Occupation-level income shocks and asset returns: their covariance and implications for portfolio choice
This paper develops and applies a simple graphical approach to portfolio selection that accounts for covariance between asset returns and an investor's labor income. Our graphical approach easily handles income shocks that are partly hedgeable, multiple risky assets, multiple risky assets, many periods, and life cycle considerations.