Boxes follow cargo, and cargo is not symmetrical
Every loaded container that arrives somewhere has to leave again, loaded or empty. Where a region imports more than it exports, the arithmetic is unavoidable: equipment accumulates, depots fill, and the practical problem becomes storage rather than supply. Where a region exports more than it imports, the same arithmetic runs the other way and the problem is finding a unit at all.
This is why availability maps so poorly onto economic size. A large importing market can be easy to source from and hard to place equipment into; a smaller exporting one can be the opposite.
























