Vehicle operating costs per km are set to be just half the normal cost for trucks and airplanes. This more accurately models the process where Zara pays for one-way shipping containers to move products from one facility to another without paying the full round-trip cost (carbon per km was also adjusted to half of normal for the same reason). This compensates for the model logic which calculates vehicle costs based on the round trip distance instead of the one-way distance.

Zara stores in a single city are represented by a single store that combines the demand of all stores in that city – not all cities are included and more cities can be added to this model.

Because Zara is a private company, specific details of the Zara business model and supply chain can be difficult to verify. Yet the supply chain model presented here is still a useful picture of the Zara supply chain and illustrates its operations and its capabilities.