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. Maintaining friendly relationships with other groups offers 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). 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 get from trading with a group, you have to float on the icon of the trade agreement, next to the group given in the diplomacy tab. The fourth separate edition is the exchange.
They exchange a good one (cereals, rice, iron, jade, silk, etc.) to get another one from the other fraction – this will result in a large increase in gold per train. It is also the most limited option – the number of trade offers depends on the evolution of the faction (level, buildings built, as well as the positions assigned to the court). You can only exchange goods with fractions that you can access directly (their border is next to yours, or if you are able to reach them through the territory of an ally). 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 several possibilities: Tilea and Estalia are also very difficult to obtain as business partners for reasons I cannot understand.
In addition, each faction on the list on the right side of the screen painted a symbol with a face in one of the colors above. Move the cursor on this topic to find out the details of the relationship – what contracts have been included between the political groups, what are the positive and negative aspects of the relationship, the current level and the level that the relationship will have in the next round.