As pointed out in this recent piece on responsive supply chains thru flexible warehouses over on the ChainLink Research site, “optimal” does not last long. Demand changes, product mix changes, freight costs change, available carriers change, available suppliers change, raw material costs change, and so on.
It’s not just the warehouse. It’s the end-to-end supply chain operation. That’s why it’s crucial that not only are sourcing projects conducted for each category consistent with the cost cycles (and, specifically, when they tend to hit their low points if the organization is able to source at that time), but that each time the project is conducted, serious effort is put into analyzing and optimizing the buy. Because if the organization simply makes the same decision it made last time, it likely is not making the optimal one.