As the amount of money invoiced in a decision rises, so does the burden of making the decision. Thus, it is not surprising or rare that the question arises: should a study be instituted before the decision is made to lessen the risks involved? Of course, such a study will itself cost something...

This paper treats the following problem. How much money should be invested at time t₀ at an interest rate of I for a time T such that the probability of the funds required "K(T)" exceeding those available "X(T)" equals at most p. That is P{K(T) X(T)} < p, where X(T) - X(t₀) exp{ I(T - t₀)}. The parameters I, T,...</p,>