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...

The paper presents the basics of a new and flexible approach to statistically modelling the activities of multi-sectoral economies (Tran Van Hoa, 1992) and applies it to study investment in five major East Asian countries (ie, China, Indonesia, Korea, Malaysia and Thailand) during the period...