Godwinson
"Well, I've got nothing."
No, it really isn't more efficient, because larger ships won't be able to go as far along the rivers that make up most of the actual trading distance that needs to be covered, and it's much much more expensive for every mile that has to be covered on land compared to on a boat.Ship base however is based on the amount one can ship however, which means it's more efficient to go large first.
EDIT: A lot of the issues here seem to be people not understanding just how expensive it is to transport goods overland in the pre-industrial world.
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