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Working Paper
Optimal taxation and debt with uninsurable risks to human capital accumulation
We consider an economy where individuals face uninsurable risks to their human capital accumulation and study the problem of determining the optimal level of linear taxes on capital and labor income together with the optimal path of the debt level. We show both analytically and numerically that in the presence of such risks it is beneficial to tax both labor and capital income and to have positive government debt.
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 private-information endowment models. In contrast to the endowment model, the value of the risk-sharing arrangement in our model always remains above autarky value, so there is no need for ...
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
How Important Is Health Inequality for Lifetime Earnings Inequality?
Using a dynamic panel approach, we provide empirical evidence that negative health shocks reduce earnings. The effect is primarily driven by the participation margin and is concentrated in less educated individuals and those with poor health. We build a dynamic, general equilibrium, life cycle model that is consistent with these findings. In the model, individuals whose health is risky and heterogeneous choose to either work, or not work and apply for social security disability insurance (SSDI). Health affects individuals’ productivity, SSDI access, disutility from work, mortality, and ...
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
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
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
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 ...
Report
Appendix for Financial Frictions and Fluctuations in Volatility
This appendix contains five sections. Section 1 provides details for the comparative statics exercise performed in the simple example. Section 2 discusses extending the model to allow firms to default on the wages for managers. Section 3 describes the firm-level and aggregate data. Section 4 contains the details of the computational algorithm. Finally, Section 5 reports the results for our model with a lower labor elasticity.
Working Paper
The Politics of Flat Taxes
We study the political determination of flat tax systems using a workhorse macroeconomic model of inequality. There is significant variation in preferred tax policy across the wealth and income distribution. The majority voting outcome features (i) zero labor income taxation, (ii) simultaneous use of capital income and consumption taxation, and (iii) essentially zero transfers. This policy is supported by a coalition of low- and middle-wealth households. Zero labor income taxation is supported by households with below average wealth, while the middle-wealth households prefer to keep the ...