The majority of the various goods entering Thesalie would not stay in the city but only be a transit for other cities, where the merchants would use the harbor to access the Diannu.
It was also primarily because of this that the sales tax collected in the city was so much, for it connected Zanzan city to the rest of the country.
Otherwise, there was no way a single war torn city could consume so much, for 25 million ropals could only go so far.
And hearing about the huge tax sales as well as the real origin behind it, Alexander would contemplate building a canal that would connect Zanzan City to the Diannu, thereby connecting his most industry part of the region to the entirety of Tibias through easy to transverse waterways.
After all, on average it was 13 times cheaper and 5 times faster to transport something by water than by land and so by building this artificial waterway, Alexander would be able to cut down on huge amounts of cost.