Quote:
Originally Posted by tbrock1031
Produce an excess of one or more products, sell elsewhere for enough money to buy what your region is lacking, and keep in transit/storage for as short a time as possible.
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In addition to transit time, also reduce transit labor per ton as much as possible. A road bound caravan is (IIRC) about 4x as labor intensive per ton-mile as riverboats, and riverboats 4x as labor intensive as open water vessels. Rome grew so large because it could import grain from as far away as Egypt.
Edit to add: Also, do as much weight saving processing as early in the logistic train as possible. Smelt ore and hew timber before investing much in transportation.