On the left (your page), the user interface shows you how much money you make from trading and what resources you export to your trading partner. The right side shows how much money they make and what resources you import from them. Tilea and Estalia are also very difficult to obtain as business partners, for reasons I can`t understand. It also depends on the characteristics of the political groups. A faction like Kislev with passive quality is in no way to trade with it. This is just one more symptom of the larger problem called Total War Diplomacy, something that has shown very little love and attention since the birth of CA. They even took the boats and cars of the poor little diplomacy on the campaign map. They waved the finger at diplomacy and also took trade routes. Each resource you export increases your group`s revenue, while each imported resource increases your trading partner`s revenue. Unfortunately, you can`t decide which resources you want to send and which resources you want to get.
In the late game, it causes situations where you can earn 100 gold from the trade, while the other faction 600 or more. However, it is always worth doing, because you are not really losing something and trade increases relations with a political group. Beastmen, Greenskin and Warriors of Chaos factions cannot act. Political groups can agree to trade with each other through diplomacy. A trade agreement between two groups You can only negotiate with other political groups if you have produced at least one tradable resource (iron, stone, wood, etc.) in one of your colonies and the group you want to trade with does not yet have it. The value of each resource is different (you can check it in the lower left corner of the diplomatic screen). Also, the amount of gold you earn through trading depends on the amount of resources you can produce (the more level of the building it can produce, the more gold you can earn with it). Diplomacy in the game may not be as important as in other games of this genre, but it remains a fairly important aspect of the gameplay. Thanks to this, you will be able to act with other factions, maintain friendly relations (or sign military treaties) or even integrate other factions into your kingdom.
It is because of tradition. By clicking on a political group, you can also see different information, for example. B all contracts between your political groups or commercial goods available to that group. If you hover the mouse over a group, you can see the list of things that have a positive and negative impact on your relationships. The information on this screen is divided into: Note: The Tomb Kings are the only fraction that actually uses resources for their mortuary worship mechanics (Edit: A similar mechanic called forging has been added for dwarves in Warhammer 2 only since this answer was originally published). . . .