This paper examines the degree to which Americans are saving optimally for retirement. Our standard for assessing optimality comes from a life-cycle model that incorporates uncertain lifetimes, uninsurable earnings and medical expenses, progressive taxation, government transfers, and pension and...

Empirical evidence suggests that there is a long lag between the time a new technology is introduced and the time at which it is widely adopted. The conventional wisdom is that these observations are inconsistent with the predictions of the frictionless neoclassical model. In this paper we show...

Many new technologies display long adoption lags, and this is often interpreted as evidence of frictions inconsistent with the standard neoclassical model. In this paper we study the diffusion of the tractor in American agriculture between 1910 and 1960 – a well known case of slow diffusion...

We discuss a simple model of intergenerational transfers with one-sided altruism: parents care about their child but the child does not reciprocate. Parents and children make investments in the child's education, investments for other purposes, and parents can transfer cash to their child. We...

We discuss a simple model of intergenerational transfers with one-sided altruism: parents care about their child but the child does not reciprocate. Parents and children make investments in the child's education, investments for other purposes, and parents can transfer cash to their child. We...

This paper quantifies the effects of the totalization agreements that coordinate the United States Social Security program with the comparable programs of other countries. For each treated country that has signed an agreement with the U.S., we construct a synthetic control country by properly...

We develop and estimate a model in which individuals make decisions on consumption, human capital investment, labor supply, and retirement. Unlike all previous work, our model allows both an endogenous wage process (which is typically assumed exogenous in the human capital and earnings dynamics...