1) There seems to be a hard limit to demand per trading partner. Across the bank I could sell only 12 pieces per trading good to the 26 provinces strong Oda clan and the 16 provinces strong Date clan. The Homna clan with one province imported 3 pieces per good. [An earlier safe game showed that the 2-prov. Date could only import 5 pieces of each good. So the first (home) province seems to give 3, while the second one gives only 2. I don't know how things go from there.]
2) The bonus between long lasting trade partners seems to depend on time and volume. My export trade volume with the two large clans goodwise four times as large, and the bonus for each trading season is 22 koku compared to 6 koku with the single province clan. So both numbers roughly match (4 vs 3.5).
3) Surplus goods are taxed at just short of half the price compared to exported goods, getting your treasury just 22 instead of 48 koku per silk package. Very similar numbers hold true for other goods obtained by sea trading points.
4) Customs are a bit of a mistery. Oda pays roughly 50 koku more than the Date, 456 compared to 407 while importing the same amount. The Homna pay 334 for a quarter of the trade volume. Costums seems to be roughly similar for each side.
5) Buildings and Arts give you tax increases on trade.
a) Externally, when trading with other people this increase seems to concern only costums, which dropped fittingly roughly 10% when I destroyed the building giving a 10% increase in trade taxes.
b) Internally, my income through surplus selling dropped only roughly 5%. Perhaps administration costs (46,7% in this camp.) or a fixed tax rate is (f.e. 50%) is figured already in.
This aspect will get tested with another campaign.
6) A big question remains the importance of the factor of harbours called "increases export capacity by +80/120 etc ". Frankly I have no idea about what it does. [This might determine the "hard limit" I mentioned earlier. If things are as I think now the export capacity is simply the number of goods a trade route can transport. So if you have 120 supply but only a simple commercial port you can only supply your trading partner at most with 80 pieces. Namban harbours might thus be incredibly important in mid to late games where trading partners are few but big, as only they can allow you to match their big demand]
7) Trade surplus selling is also yet a riddle. I can not understand why it increases and why it suddendly stops to do so at 29000. Still a lot of work to do.
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