I can't find any detailed explanation for how exactly this works.
I thought it was as simple as: I have trade power in a node, therefore I have some power in all nodes upstream from that node. That doesn't seem to be the case.
Example: (this is not exhaustive)
Playing as Venice, I have merchants in Wien, Ragusa, Constantinople, Aleppo, and Alexandria. I have provinces in Venice, Ragusa, Constantinople, and Alexandria (this is exhaustive). I am getting the Transfer from Trader Downstream Bonus in Wien, Ragusa, Constantinople, Alexandria, Aleppo, and Gulf of Aden (maybe some other places). I am noticeably NOT getting Transfer from Trader Downstream in Persia, even though I have a Merchant and trade power in Aleppo.
It seems to me that the Transfer from Trader Downstream bonus is only given if you have at least one province in the upstream node. However, it also seems to be a percentage of all power, not just power provided by those provinces. For example, adding light ships to Venice trade node was very effective at spreading trade power all over the place.
So yeah, how exactly does this work? What percentage of trade power is added upstream? What criteria is needed to be met in order for this bonus to apply?
I thought it was as simple as: I have trade power in a node, therefore I have some power in all nodes upstream from that node. That doesn't seem to be the case.
Example: (this is not exhaustive)
Playing as Venice, I have merchants in Wien, Ragusa, Constantinople, Aleppo, and Alexandria. I have provinces in Venice, Ragusa, Constantinople, and Alexandria (this is exhaustive). I am getting the Transfer from Trader Downstream Bonus in Wien, Ragusa, Constantinople, Alexandria, Aleppo, and Gulf of Aden (maybe some other places). I am noticeably NOT getting Transfer from Trader Downstream in Persia, even though I have a Merchant and trade power in Aleppo.
It seems to me that the Transfer from Trader Downstream bonus is only given if you have at least one province in the upstream node. However, it also seems to be a percentage of all power, not just power provided by those provinces. For example, adding light ships to Venice trade node was very effective at spreading trade power all over the place.
So yeah, how exactly does this work? What percentage of trade power is added upstream? What criteria is needed to be met in order for this bonus to apply?