A supply chain will always be limited by finite resources. Labor is unpredictable and money comes and goes, but space and minutes in a day remain unchanged. For all the efforts to pack productivity into those minutes, much of the supply chain doesn't have a solid grasp of how much space it uses. The quantity and dimensions of storage locations can give a sense of capacity, but how full or empty they are-to the cubic inch-can be anybody's guess. Units and how fast they move tell us something about throughput, but not the total weight to the ounce. And, the precise dimensions of items that leave a building are less than precise, and the parties on either side of the dock are paying or charging accordingly.
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