Orders placed online are assembled in facilities whose design determines how quickly and cheaply that can be done.
Receiving and stowing
Inventory arrives, is checked and is placed into storage.
Which in many large operations uses random rather than categorised placement.
Random stow reduces walking distance because popular items end up distributed throughout, which is counterintuitive and measurably effective.
Picking
Retrieving items for orders.
Which is the most labour-intensive stage and the main target for automation.
Mobile robotic shelving brings inventory to stationary workers in newer facilities.
Sortation and packing
Grouping items by order and packaging them.
Which involves automated systems selecting box sizes.
Right-sizing packaging reduces material cost and shipping volume simultaneously.
The last mile
Delivery from a local facility to an address.
Which is the most expensive stage per parcel.
Route density — parcels delivered per mile driven — is the key economic variable.
Returns processing
Receiving, inspecting and routing returned items.
Which frequently costs more than the item's residual value.
This economics determines whether goods are restocked, liquidated or disposed of.
Network design
Locating facilities to reduce distance to customers.
Which is what enables next-day delivery across large geographies.
The capital investment required is a substantial barrier to competing operations.
Labour
Working conditions, productivity monitoring and injury rates have attracted regulatory and journalistic attention.
Which has produced legislative proposals on quota disclosure in several jurisdictions.
Injury rate data is published by safety authorities and by companies in some cases.
What it means for shoppers
Speed is a function of network investment, and the cost is embedded in prices and subscription fees rather than being free.
Inventory placement
Deciding which facility holds which products.
Which determines delivery speed and shipping cost.
Forecasting regional demand accurately is what makes fast delivery economic.
Third-party sellers
Marketplace sellers using the platform's fulfilment services.
Which gives access to the delivery network for a fee.
Commingled inventory storage means the item received may come from a different seller than the one selected.
Automation
Robotics, conveyance and automated sortation.
Which has changed the labour mix rather than eliminating it.
Investment is justified by throughput and by reducing the most physically demanding tasks.
Peak season
Seasonal hiring at very large scale.
Which is a substantial temporary labour market in itself.
Training and safety during rapid scaling have been points of criticism.
The shopper's view
Delivery speed reflects network investment, and slower options are genuinely cheaper to fulfil.
Sortation centres and delivery stations
Facilities between fulfilment and delivery that consolidate parcels by route.
Which is what makes dense delivery routes possible.
Network design at this layer determines delivery speed as much as inventory placement does.
Delivery contractor models
Independent contractors and small delivery firms operating branded routes.
Which has been the subject of litigation over employment classification.
Outcomes have varied by jurisdiction and by specific arrangement.
Same-day and rapid delivery
Requires inventory very close to customers.
Which limits assortment to what fits in local facilities.
The economics work in dense urban areas and generally not elsewhere.
Environmental measures
Electric delivery vehicles, packaging reduction and consolidated shipping options.
Which are reported in company sustainability disclosures.
Slower delivery options have measurably lower emissions per parcel.
What the shopper controls
Delivery speed selection, consolidation of orders and collection point use.
What it costs
Fast delivery is expensive and is funded through prices, subscription fees and marketplace commissions rather than being genuinely free.
The last mile is the largest component, which is why collection points and slower options cost less to provide.
The shopper's lever
Choosing slower delivery or a collection point reduces both cost and emissions per parcel measurably.
Working conditions
Productivity monitoring, injury rates and quota practices have attracted legislative attention in several states.
Which has produced disclosure requirements about quotas in some jurisdictions.
Injury rate data is published by safety authorities and is comparable across industries.
A closing observation
Next-day delivery required building a physical network of enormous scale, and the cost of that network is in every price and subscription fee.
Choosing a slower option or a collection point is genuinely cheaper to serve, which is why retailers increasingly price the difference explicitly.
A practical checklist
Choose slower delivery where timing permits, consolidate orders, and use collection points where available.
All three reduce cost to fulfil and emissions per parcel, and retailers increasingly price the difference explicitly rather than absorbing it.
The network effect
Delivery speed is a function of how close inventory sits to customers, which is a function of capital invested in facilities.
That is why the fastest operators are the largest ones, and why competing on speed requires matching a network rather than matching a service.
One last point
Every element of the speed people now expect required physical infrastructure built over years at enormous cost.
That cost is embedded in prices and subscription fees, which is why free next-day delivery is neither free nor a given.