It also depends on the characteristics of the political groups. A group like Kislev, which has passive quality, is by no means to act. I have never seen evidence that more commercial resources would increase the likelihood of someone agreeing to a trade agreement. The diplomatic system is very veiled here. I have seen that groups with 200-plus relationships are opposed to profitable trade for them and that groups with 5-strong relationships accept the same trade. In addition, by clicking on a group in the tab on the right, you will see a list of contracts and agreements binding the group, as well as some information about the commercial goods they have (the ones they import and export). Here you can find some personal information about group leaders. At the bottom of the screen are contracts signed by different factions. If you show with the mouse above the symbol of the given fraction, you will see a list of factors that affect your relationships. There are different possibilities: maintaining friendly relationships with other groups offers you a number of advantages.
First, the trade agreement and the non-aggression pact that guarantees the security of your country. The Military Access Treaty allows your armies to move freely on the territories of another faction (which, without it, is treated as a violation of borders and deteriorates your relations). It`s because of the Lore. If you were an elf, you wouldn`t negotiate with a vampire. Although diplomacy is often limited to other factions of the same race, you should take a moment to learn more. Diplomacy allows you to conclude trade agreements, non-aggression pacts and even military and defence alliances (if your relations are good enough). In the case of fractions of the same race, you can also try to integrate them under your reign. Trade can take place between two political groups in campaign mode. Trade agreements can be concluded on the diplomatic screen, allowing political groups to exchange trade resources and generate additional revenue for both factions. Trade is an exchange of goods that you can produce in certain buildings (wood, iron, exotic animals, etc.). You can act with another group if you don`t have the resource you`re acting on – otherwise they won`t be interested. Different goods have different prices, the more income from trade depends on the amount of resource you produce.
On the left (on your side), the interface shows you how much you earn with the trade and resources you export to your trading partner. The right side shows how much money they earn 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. Political groups can agree on trade through diplomacy. A trade agreement between two factions Each resource you export brings a sum of money per train. The revenue you receive from the resource can be verified by indicating the resource listed in the Diplomacy with the Mouse tab. To check how much money you receive from trading with a political group, you must float above the trade agreement icon, next to the group in the diplomatic tab. Beastmen, Greenskin and the warriors of the chaos factions cannot act. Note: The Tomb Kings are the only faction that actually uses resources for their mortuary cult mechanics (Edit: a similar mechanic called forgery has been added to the dwarves in Warhammer 2 only since this response was originally published).
For all other groups, resources only increase the value of trade agreements. So you`re generally right to think that these resources are not actually used by the trading partner, but not in this particular example.