We quantify the inefficiency of the retirement component of the US social security system within a model where agents receive idiosyncratic labor-productivity shocks that are privately observed

This paper investigates the one-sector growth model where agents experience idiosyncratic endowment shocks and face a borrowing constraint. It is shown that a steady-state capital level lies strictly above the steady state in the model without shocks. In addition, the capital stock increases...

Is the use of fiat money essential in any efficient organization of exchange? We investigate this question in economies that are generalizations of the Townsend (1980) turnpike model that include limited commitment and differential information. We show that in the Townsend turnpike model fiat...

This paper investigates why high income households in the United States save on average more than low income households in cross-section data. The three explanations considered are (1) age differences across households, (2) temporary earnings shocks, and (3) the structure of transfer payments....

It is commonly conjectured that expected wealth accumulation increases when earnings risk increases as long as the utility function in each period is increasing, concave and has a positive third derivative. We present a counter example which highlights the importance of the convexity of the...

When does an individual's expected wealth accumulation profile increase as earnings risk increases? This paper answers this question for multi-period models where earnings shocks are independent over time. Sufficient conditions are stated in terms of properties of a decision rule for savings...

We assess the consequences of substantially increasing the marginal tax rate on U.S. top earners using a human capital model. We nd that (1) the peak of the model Laer curve occurs at a 52 percent top tax rate, (2) if human capital were exogenous, then the top of the Laer curve would occur at a...

This paper posits a notion of the value of an individual's human capital and the associated return on human capital. These concepts are examined using U.S. data on male earnings and financial asset returns. We decompose the value of human capital into a bond, a stock and a residual value...

We assess the consequences of substantially increasing the marginal tax rate on U.S. top earners using a human capital model. The top of the model Laffer curve occurs at a 53 percent top tax rate. Tax revenues and the tax rate at the top of the Laffer curve are smaller compared to an otherwise...

The life-cycle patterns of consumption, wage and hours inequality observed in U.S. cross-section data are commonly viewed as incompatible with a Pareto efficient allocation. We determine the extent to which these qualitative and quantitative patterns can or cannot be produced by Pareto efficient...