Because some ports are becoming increasingly limited in their ability to handle ever-larger ships it is possible that

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Given the cost advantages of economies of scale,ship sizes will probably not become smaller; while ocean shipping costs may or may not decline,it will not be directly due to the obsolescence of some ports,and economically some ports cannot be successfully upgraded to handle the big ships.It is likely there will be a need to create large port hubs for large ships,while smaller ports would service "feeder" ships.

Because Some Ports Are Becoming Increasingly Limited in Their Ability