First come. First served. Simple and predictable Most warehouses default to first-come, first-served allocation because it's the path of least resistance. Order comes in, it gets the next available inventory. No arguments, no exceptions, no one second-guessing the system. And honestly, for a lot of operations, that's fine. Simple rules are underrated. But here's where first-come starts to hurt you. Imagine you're running a mixed SKU DC — say, consumables and seasonal gear shi