This method uses information from the simulation slot Marginal Storage Value Table to generate a cumulative storage value table. The cumulative storage value can be thought of as the summation of the marginal storage values from a storage of 0 to the current storage. Therefore, the automation method finds the same midpoint values used by the simulation Future Value method, and uses those points in the table.

If only one value exists in the Marginal Storage Value Table, then only two entries will exist in the Cumulative Storage Value Table. The two entries will be 0, and midway between the value in the Marginal Storage Value Table and the maximum value set on the Storage slot. If more than one value exists, three or more points will result. Following is an example Marginal Value Table (Table 22.1), the resulting Cumulative Storage Value Table (Table 22.2), and a graph of the Cumulative Storage Value data.