Costs for each postal activity (mail processing, delivery, etc) that can be attributed to mail volumes, are divided by total volume to obtain an estimate of the marginal cost.
The estimates for costs are pretty accurate for the mailings.
mnli hypothesis: The estimates for costs are pretty accurate for the mailings. premise: Costs for each postal activity (mail processing, delivery, etc) that can be attributed to mail volumes, are divided by total volume to obtain an estimate of the marginal cost.