An e-commerce supply chain is the network of sourcing, inventory, warehousing, order fulfillment, delivery and returns that gets an online order from a supplier to a customer’s door. It differs from a traditional retail supply chain because orders are small, arrive one at a time, ship to homes, and often come back.
That shift moves cost and complexity from bulk store replenishment to picking, packing, last-mile delivery and returns processing.
How it differs from a retail supply chain
A store-based chain moves pallets and cartons to a few hundred locations. An e-commerce chain moves individual parcels to thousands or millions of addresses. The unit of work becomes the single order line, and delivery promises become part of the product.
| Area | Store retail | E-commerce |
|---|---|---|
| Order size | Bulk replenishment to stores | Small orders, often one to a few items |
| Delivery | Truckload to a store | Parcel to a home or pickup point |
| Inventory | Held at stores and a distribution centre | Held centrally or spread across several fulfillment sites |
| Returns | Handled at the store counter | Shipped back, inspected, then resold, refurbished or discarded |
| Demand pattern | Tied to store traffic | Spiky, driven by promotions and seasons |
The main stages
- Sourcing and inbound. Buying from suppliers or manufacturers and moving goods into the network, sometimes from overseas.
- Inventory placement. Deciding which products sit in which warehouse, so orders ship from a site close to the customer.
- Order management. Capturing the order, checking stock, and choosing the fulfillment location.
- Pick, pack and ship. Warehouse work that has to be fast and accurate for each order.
- Last-mile delivery. The final leg, usually the most expensive per parcel.
- Returns. Collection, inspection and disposition of returned goods.
Fulfillment models
Sellers generally pick one or mix several fulfillment models, depending on volume, product type and how much control they want over the customer experience.
- In-house fulfillment: the seller runs its own warehouse. Most control, but fixed costs and management effort.
- Third-party logistics (3PL): an outside provider stores and ships orders. Flexible capacity, less direct control.
- Marketplace fulfillment: the marketplace operator stores and ships goods. Convenient, but ties the seller to marketplace rules and fees.
- Dropshipping: the supplier ships directly to the customer. Low inventory risk, but limited control over speed and quality.
- Store-based fulfillment: retail stores pick online orders or serve as pickup points.
Inventory placement and speed
Faster delivery usually means holding stock closer to customers, which means more locations and more total inventory. Each added site raises holding cost and the risk that stock sits in the wrong place. Fewer sites cut inventory but lengthen delivery times and raise parcel cost. The right balance depends on how much customers value speed against price for the products in question.
Canada adds its own constraints: long distances between major population centres, remote regions that are costly to serve, winter weather that affects transit times, and cross-border shipments that must clear customs with the Canada Border Services Agency.
Returns as a design problem
Returns are a regular part of online selling, especially in categories where size, fit or appearance matters. A good process sets clear return rules, makes inspection quick, and sends each item to the right outcome: back to stock, discount sale, refurbishment, donation or disposal. Slow returns processing ties up inventory that could be sold again.
Where AI and analytics help
Demand forecasting at product and location level, inventory allocation across sites, order routing to the cheapest or fastest site, and delivery-time estimates are the common uses. These tools depend on clean order, stock and carrier data. They support planners but do not remove the need to set service policies and review exceptions.
Checklist for reviewing an e-commerce supply chain
- Are delivery promises based on real carrier and warehouse performance?
- Is inventory visible by location, including stock in transit and in returns?
- Does order routing consider both shipping cost and delivery time?
- Are return reasons recorded and fed back to product and supplier teams?
- Is there a plan for peak periods, including temporary labour and carrier capacity?
Common questions
What is the biggest cost in e-commerce fulfillment?
Delivery to the customer is typically the largest single cost per order, followed by warehouse labour. The mix varies by product size, weight and delivery speed.
Should a small seller use a 3PL?
Often yes, once order volume outgrows a spare room or small unit. A 3PL converts fixed costs into per-order fees, though the seller should compare pricing, integrations and service levels first.
Sources and further reading
- Council of Supply Chain Management Professionals (CSCMP)
- Association for Supply Chain Management (ASCM)
- Transportation and warehousing (Statistics Canada) (Statistics Canada)