This can also be a useful reason for trade. Salt can only be mined in limited areas inland and produced on the coast. Salt trading would be one of the major commercial enterprises in T2k. I haven't thought about it that much, but it seems there might be the highest demand in the fall as communities prepare for the winter and 'salt away' food. Why not kill that extra hog in October and salt it for eating later instead of feeding it all winter?
There are some spectacular salt mines southeast of Krakow by the way.
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