The anit-commutative restriction. It is why multi-screen theaters cannot have one single file line, they have to sub-divide, a deterministic pit boss. Efficiency is keep the line short but not zero, except for clerks (the source of asymmetry).
The loading dock at Walmart feeds a tiny warehouse, where commuttativity reigns supreme. But the more commuttativity you have in inventory, the higher the the cost; it cost money.
Commutative property is a constraint, a conserved quantity, it is the Walmart building, the cost of re-stockers, the price of making 'elbow room'. It is 'accurate enough', there is a fixed constraint, enough room for the common person to execute the complete rock throw. Think of an adolescent throwing the prefect baseball strike with a can of tuna. That is the human bounds.
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