A lifetime portfolio of risky and risk-free sexual activities is conceptually constructed in this paper. People's time allocation between risky and risk-free sexual activities affects, and is affected by, the prevalence of AIDS. A small satisfaction differential between risky sex and risk-free...

Hotelling's conceptual framework is expanded to incorporate the effects of a backstop technology on the planning horizon of the suppliers of an exhaustible resource and its price and quantity trajectories. It is shown that in the non-trivial case, the presence of a backstop technology shortens...

We introduce an element of centralization in a random matching model of money that allows for private liabilities to circulate as media of exchange. Some agents which we identify as banks, are endowed with the technology to issue notes and to record-keep reserves with a central clearinghouse,...

This paper considers the estimation of dynamic structural models where the decision variables are censored. We present and discuss several econometric issues and estimation methods under alternative stochastic structure of the unobservables, different potential sources of censoring, and...

The essential idea of equilibrium search models of labor market behavior is that wage policy matters. In this paper we provide for estimating equilibrium search models using a non-parametric estimator of heterogeneity.