Fulfillment economics guide
A useful fulfillment cost model separates recurring unit economics from irregular work. Model receiving, storage, pick and pack, packaging, transportation, returns, account support, and exception handling with the same order and SKU assumptions. Compare providers only after pass-through carrier charges, dimensional weight, minimums, and one-time work are normalized.
Decision support
Use the same definitions and evidence across every option. A comparison is not reliable when one path uses best-case assumptions and another uses observed operating data.
| Cost category | Primary driver | Useful unit | Question to resolve |
|---|---|---|---|
| Receiving | Inbound method, cartons or pallets, labeling, count method | Per pallet, carton, unit, or labor hour | What evidence confirms quantity and condition? |
| Storage | Footprint, inventory profile, dwell time, seasonality | Pallet, bin, cubic volume, or location per period | How are partial periods and overflow handled? |
| Pick and pack | Units per order, variants, bundle rules, packaging | Base order plus additional item or workflow step | Which actions are included in the base fee? |
| Transportation | Zone, service, weight, dimensions, surcharge profile | Shipment | Is the model using actual package dimensions and destinations? |
| Returns | Inspection depth, disposition, relabeling, restock work | Return, unit, or labor step | Which outcomes return inventory to sellable status? |
| Exceptions | Manual research, special projects, relabeling, rush work | Labor hour, project, or event | What requires approval before work begins? |
Execution
Move to the next step only when the evidence and owner for the current step are clear.
Calculate order lines, units per order, package dimensions, destination zones, service levels, and return rates from a meaningful operating period rather than a best-case average.
Keep setup and account minimums separate from per-order work. Identify carrier, duty, postage, and other pass-through costs rather than blending them into handling.
Include launch inventory, slow-moving variants, replenishment frequency, peak stock, quarantine, returns, and any inventory that cannot share a standard location.
Use actual packed dimensions and billable weight rules. A low item weight does not guarantee a low transportation charge when packaging occupies more space.
Compare a normal month, a peak period, and a disruption scenario. Include the work needed for relabeling, inventory correction, return inspection, and carrier claims.
Tie invoice lines back to orders, receipts, storage periods, projects, and pass-through charges. Update assumptions when the real workflow differs from the quote model.
Boundaries
Primary sources
