Cost structure / standard tiers
| Segment | Typical Cost Driver | Relative Cost Share |
|---|---|---|
| First-mile (factory to port/DC) | Container/truckload rate, divided across high unit volume | Lowest per-unit cost |
| Middle-mile (port/DC to regional hub) | Linehaul trucking or rail, line-haul efficiency | Moderate per-unit cost |
| Last-mile (hub to end customer) | Per-stop delivery, density, failed-delivery re-attempts | 40-53% of total shipping cost |
Last-mile cost variance is driven heavily by delivery density — rural or low-density suburban routes can cost 2-4x more per package than dense urban routes, since the carrier's per-stop cost stays roughly fixed while the number of stops per route mile drops.
Risk mitigation / operational guidance
When evaluating 3PL or fulfillment partners, ask for last-mile cost broken out by delivery zone density rather than a single blended average — a national flat rate can mask significant margin loss on rural or low-density orders. For e-commerce shippers, track failed-delivery and re-attempt rates by carrier and zip code; a high re-attempt rate inflates last-mile cost well beyond the quoted base rate and is a common, under-tracked cost leak. If first-mile consolidation point selection is flexible, locating it closer to the last-mile delivery density center (rather than purely optimizing for lowest first-mile linehaul cost) can reduce total landed cost even if first-mile cost increases slightly, since last-mile inefficiency dominates total cost share.