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Consolidating shipments does not remove the full cost of each shipment eliminated, because a consolidated load is larger and costs more — roughly 70% of the removed shipments' cost is saved. That gross saving must then be netted against the extra inventory the less frequent deliveries create.
Gross freight saving
Saving = Shipments removed x Cost per shipment x 70%
Net saving
Net = Gross freight saving - Additional inventory holding cost
Because freight rates are not purely per-shipment; a heavier consolidated load costs more than a light one. The fixed element is what you actually save.
When the goods are high-value or perishable, so the inventory holding cost of less frequent delivery exceeds the freight saving.