The paper derives efficient methods for solving basic fundamental tasks of warehouse logistics in what amount and when to resupply the stocks by means of the “case-based reasoning” approach. The aim is to give a satisfactory response, including its economic interpretation under conditions of uncertainty. Therefore, the discrete case is first studied in detail by means of the tools of microeconomic analysis and accomplished results are then generalized by the limiting transition to the continuous case. In both cases, the discreet and continues one, the method relies on the value of the newly established indicator of the storage efficiency, which indicates that what inventory items are worth storing in the case of the limited storage capacity. Its value depends on the fragment of the probability distribution of the demand during the delivery time.