Consolidation of courier and logistics services for online stores

Most online stores have their own small courier service, perhaps their own warehouse of goods. Such things increase the cost of services online store, while the price - this is their main advantage compared with conventional stores. If the store is small, the delivery of the goods can turn into a headache, since orders can arrive from different areas of the city and it is necessary to correctly calculate the route in order to deliver the goods quickly and with minimal losses to the buyer. If the order is received from another city, then larger courier services will be connected and the costs for the buyer will increase.

The idea is to combine a large number of online stores with a single courier service with the ability to store goods in a single warehouse. For now, we will not discuss the security of storage of goods of different owners, but consider the idea as a whole.
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What an online store gets: do not think about the delivery of goods and, accordingly, pay your couriers their salaries. In the case of a single service, such costs will decrease by an order of magnitude. Accordingly, you can reduce the price of the assortment and become more competitive in relation to other stores (for those who are not in the union :) For a single delivery service to work, it is very desirable to move the warehouse of goods onto the shoulders of this service. This will speed up the formation of the order and delivery of goods to customers and reduce the cost of maintaining its own warehouse.

What the buyer gets: a lower cost for the delivery of goods due to the logistics of a single delivery service - you need to deliver a lot and it is more profitable than delivering piece goods. Competent logistics management will increase the speed of delivery. It creates a more loyal attitude to the shops that use this service. Users will know exactly how this service works, will trust the single brand, will trust the online store, since the goods will be stored in the central warehouse and there are guarantees that the store will not deliver with delivery.

I understand that there are so many pitfalls in this service and I suggested a general idea and possibilities. I would be glad if someone like it, finalize and implement it.