In this paper, we consider optimal insurance and consumption rules for a wage earner whose lifetime is random. The wage earner is endowed with an initial wealth, and he also receives an income continuously, but this may be terminated by the wage earner’s premature death. We use dynamic programming to analyze this problem and derive the optimal insurance and consumption rules. Explicit solutions are found for the family of CRRA utilities, and the demand for life insurance is studied by examining our solutions and doing numerical experiments.

We present a general model for the optimal consumption of a nonrenewable resource under two kinds of uncertainties. One source of uncertainty is in the resource discovery process and the other is in the economic environment that affects resource supply and demand conditions, such as exhaustion and development of a substitute. The problem is formulated as one of optimally controlling a storage process with Markov additive discoveries. The optimal value of the resource stock is characterized as the solution of a functional equation and the existence of an optimal consumption policy is established. It is shown that, in a given environment, the optimal consumption rate is increasing and the resource price is decreasing in the level of proven reserves. A counterexample is provided to show that better environments may in fact mean higher prices and lower consumption rates. Finally, a variety of examples is given to illustrate the scope and applicability of the general model.

[We consider the intertemporal problem of optimally consuming a natural resource and exploring for new sources of supply of that resource. Resource consumption yields social utility while the exploration effort controls the uncertainty in the timings of discoveries as well as their magnitudes. The objective is to choose an optimal consumption and exploration policy so as to maximize the expected discounted utility of consumption net of the exploration cost over an infinite planning horizon. We present a controlled storage process model of the problem and under reasonable conditions we characterize the existence and the properties of optimal policies and prices.]