Generalized Backhaul Law: Every sufficiently complex system has a preferred direction with forward DO behaviors being asymmetrically more efficient than backward UNDO behaviors.
Container shipping backhaul
Package returns (reverse logistics)
Payment reversals/refunds
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The more common direction is the more efficient one because it has been optimized, often at the expense of the other direction
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that's sort of backwards... it is emergent optimized because it is the more common direction (more frequent events driving the learning curve and fleshing out various edge cases and things) ie the direction precedes the optimization, which does not need to be consciously pursued

